-const char jcc_rcs[] = "$Id: jcc.c,v 1.130 2007/04/19 13:47:34 fabiankeil Exp $";
+const char jcc_rcs[] = "$Id: jcc.c,v 1.310 2009/12/29 13:17:37 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) 2001-2007 the SourceForge
+ * Copyright : Written by and Copyright (C) 2001-2009 the SourceForge
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
- * Revisions :
- * $Log: jcc.c,v $
- * Revision 1.130 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
- *
- *
*********************************************************************/
-\f
+
#include "config.h"
#include "filters.h"
#include "loaders.h"
#include "parsers.h"
-#include "killpopup.h"
#include "miscutil.h"
#include "errlog.h"
#include "jbsockets.h"
const char jcc_h_rcs[] = JCC_H_VERSION;
const char project_h_rcs[] = PROJECT_H_VERSION;
-int no_daemon = 0;
+int daemon_mode = 1;
struct client_state clients[1];
struct file_list files[1];
int g_terminate = 0;
#endif
-static void listen_loop(void);
+#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 */
#define sleep(N) DosSleep(((N) * 100))
#endif
-#ifdef FEATURE_PTHREAD
-pthread_mutex_t log_mutex;
-pthread_mutex_t log_init_mutex;
+#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
-pthread_mutex_t gmtime_mutex;
+privoxy_mutex_t gmtime_mutex;
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_LOCALTIME_R
-pthread_mutex_t localtime_mutex;
+privoxy_mutex_t localtime_mutex;
#endif /* ndef HAVE_GMTIME_R */
-#ifndef HAVE_GETHOSTBYADDR_R
-pthread_mutex_t gethostbyaddr_mutex;
-#endif /* ndef HAVE_GETHOSTBYADDR_R */
-
-#ifndef HAVE_GETHOSTBYNAME_R
-pthread_mutex_t gethostbyname_mutex;
-#endif /* ndef HAVE_GETHOSTBYNAME_R */
-
#ifndef HAVE_RANDOM
-pthread_mutex_t rand_mutex;
+privoxy_mutex_t rand_mutex;
#endif /* ndef HAVE_RANDOM */
-#endif /* FEATURE_PTHREAD */
+#endif /* def MUTEX_LOCKS_AVAILABLE */
-#if defined(unix) || defined(__EMX__)
+#if defined(unix)
const char *basedir = NULL;
const char *pidfile = NULL;
-int received_hup_signal = 0;
+static int received_hup_signal = 0;
#endif /* defined unix */
-/* The vanilla wafer. */
-static const char VANILLA_WAFER[] =
- "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
- "Do_not_send_me_any_copyrighted_information_other_than_the_"
- "document_that_I_am_requesting_or_any_of_its_necessary_components._"
- "In_particular_do_not_send_me_any_cookies_that_"
- "are_subject_to_a_claim_of_copyright_by_anybody._"
- "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
- "(copyright_or_otherwise)_applying_to_any_cookie._";
-
/* HTTP snipplets. */
-const static char CSUCCEED[] =
- "HTTP/1.0 200 Connection established\n"
+static const char CSUCCEED[] =
+ "HTTP/1.0 200 Connection established\r\n"
"Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
-const static char CHEADER[] =
- "HTTP/1.0 400 Invalid header received from browser\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 browser.\r\n";
-
-const static char CFORBIDDEN[] =
- "HTTP/1.0 403 Connection not allowable\r\n"
- "Proxy-Agent: Privoxy " VERSION "\r\n"
- "X-Hint: If you read this message interactively, then you know why this happens ,-)\r\n"
- "Connection: close\r\n\r\n";
+ "Invalid header received from client.\r\n";
-const static char FTP_RESPONSE[] =
- "HTTP/1.0 400 Invalid request received from browser\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";
-const static char GOPHER_RESPONSE[] =
- "HTTP/1.0 400 Invalid request received from browser\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 */
-const static char MISSING_DESTINATION_RESPONSE[] =
- "HTTP/1.0 400 Bad request received from browser\r\n"
+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 */
-const static char NO_SERVER_DATA_RESPONSE[] =
- "HTTP/1.0 502 Server or forwarder response empty\r\n"
+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"
- "Empty server or forwarder response.\r\n"
- "The connection was closed without sending any data.\r\n";
+ "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
+#if 0
/* XXX: should be a template */
-const static char NULL_BYTE_RESPONSE[] =
- "HTTP/1.0 400 Bad request received from browser\r\n"
+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";
+
+static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
+ "HTTP/1.0 503 Too many open connections\r\n"
+ "Proxy-Agent: Privoxy " VERSION "\r\n"
+ "Content-Type: text/plain\r\n"
+ "Connection: close\r\n\r\n"
+ "Maximum number of open connections reached.\r\n";
+
+static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
+ "HTTP/1.0 504 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 because the client request didn't arrive in time.\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)
/*********************************************************************
*
break;
case SIGHUP:
+#if defined(unix)
received_hup_signal = 1;
+#endif
break;
default:
* FALSE if the request doesn't look invalid.
*
*********************************************************************/
-int client_protocol_is_unsupported(const struct client_state *csp, char *req)
+static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
{
- char buf[BUFFER_SIZE];
-
/*
* If it's a FTP or gopher request, we don't support it.
*
*/
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))
{
- strcpy(buf, FTP_RESPONSE);
- log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as FTP proxy: %s",
- csp->ip_addr_str, req);
+ response = FTP_RESPONSE;
+ protocol = "FTP";
}
else
{
- strcpy(buf, GOPHER_RESPONSE);
- log_error(LOG_LEVEL_ERROR, "%s tried to use Privoxy as gopher proxy: %s",
- csp->ip_addr_str, req);
+ response = GOPHER_RESPONSE;
+ protocol = "GOPHER";
}
- log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
+ 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, buf, strlen(buf));
+ write_socket(csp->cfd, response, strlen(response));
return TRUE;
}
* JB_ERR_PARSE if it isn't.
*
*********************************************************************/
-jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
+static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
{
- char buf[BUFFER_SIZE];
char *req;
if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
csp->ip_addr_str, csp->http->cmd);
- strcpy(buf, CHEADER);
- write_socket(csp->cfd, buf, strlen(buf));
+ 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))
{
+#ifndef FEATURE_EXTENDED_HOST_PATTERNS
/* Split the domain we just got for pattern matching */
init_domain_components(csp->http);
+#endif
return JB_ERR_OK;
}
csp->ip_addr_str, csp->http->cmd, req);
freez(req);
- strcpy(buf, MISSING_DESTINATION_RESPONSE);
- write_socket(csp->cfd, buf, strlen(buf));
+ write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
destroy_list(headers);
return JB_ERR_PARSE;
* JB_ERR_PARSE if the headers were incomplete.
*
*********************************************************************/
-jb_err get_server_headers(struct client_state *csp)
+static jb_err get_server_headers(struct client_state *csp)
{
int continue_hack_in_da_house = 0;
char * header;
- while (((header = get_header(csp)) != NULL) || continue_hack_in_da_house)
+ while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
{
if (header == NULL)
{
{
/*
* It's a bodyless continue response, don't
- * stop header parsing after reaching it's end.
+ * stop header parsing after reaching its end.
*
* As a result Privoxy will concatenate the
* next response's head and parse and deliver
return JB_ERR_PARSE;
}
- /* Enlist header */
if (JB_ERR_MEMORY == enlist(csp->headers, header))
{
/*
* Returns : A string with the crunch reason or an error description.
*
*********************************************************************/
-const char *crunch_reason(const struct http_response *rsp)
+static const char *crunch_reason(const struct http_response *rsp)
{
char * reason = NULL;
case RSP_REASON_OUT_OF_MEMORY:
reason = "Out of memory (may mask other reasons)";
break;
+ case RSP_REASON_CONNECTION_TIMEOUT:
+ reason = "Connection timeout";
+ break;
+ case RSP_REASON_NO_SERVER_DATA:
+ reason = "No server data received";
+ break;
default:
reason = "No reason recorded";
break;
* Returns : Nothing.
*
*********************************************************************/
-void send_crunch_response(struct client_state *csp, struct http_response *rsp)
+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];
status_code[2] = rsp->head[11];
status_code[3] = '\0';
+ /* 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);
+
/* 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_error(LOG_LEVEL_ERROR,
+ "Couldn't deliver the error message through client socket %d: %E",
+ csp->cfd);
}
- /* Log that the request was crunched and why. */
- log_error(LOG_LEVEL_GPC, "%s%s crunch! (%s)",
- http->hostport, http->path, crunch_reason(rsp));
- log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %d",
- csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
-
/* Clean up and return */
if (cgi_error_memory() != rsp)
{
}
+#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.
* FALSE otherwise.
*
*********************************************************************/
-int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
+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 */
} while (tmp_len < len);
log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
- "(length=%d, strlen=%d).", csp->ip_addr_str, len, c_len);
+ "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
log_error(LOG_LEVEL_HEADER,
"Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
- strcpy(buf, NULL_BYTE_RESPONSE);
- write_socket(csp->cfd, buf, strlen(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 FALSE;
}
+#endif
/*********************************************************************
*
* 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.
*
*********************************************************************/
-int crunch_response_triggered(struct client_state *csp)
+static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
{
-/*
- * This next lines are a little ugly, but they simplify the if statements
- * below. Basically if TOGGLE, then we want the if to test if the
- * CSP_FLAG_TOGGLED_ON flag ist set, else we don't. And if FEATURE_FORCE_LOAD,
- * then we want the if to test for CSP_FLAG_FORCED, else we don't.
- */
-#ifdef FEATURE_TOGGLE
-# define IS_TOGGLED_ON_AND (csp->flags & CSP_FLAG_TOGGLED_ON) &&
-#else /* ifndef FEATURE_TOGGLE */
-# define IS_TOGGLED_ON_AND
-#endif /* ndef FEATURE_TOGGLE */
-#ifdef FEATURE_FORCE_LOAD
-# define IS_NOT_FORCED_AND !(csp->flags & CSP_FLAG_FORCED) &&
-#else /* ifndef FEATURE_FORCE_LOAD */
-# define IS_NOT_FORCED_AND
-#endif /* def FEATURE_FORCE_LOAD */
-
-#define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
-
struct http_response *rsp = NULL;
+ const struct cruncher *c;
- if (
- /* We may not forward the request by rfc2616 sect 14.31 */
- (NULL != (rsp = direct_response(csp)))
-
- /* or we are enabled and... */
- || (IS_ENABLED_AND (
-
- /* ..the request was blocked */
- ( NULL != (rsp = block_url(csp)))
-
- /* ..or untrusted */
-#ifdef FEATURE_TRUST
- || ( NULL != (rsp = trust_url(csp)))
-#endif /* def FEATURE_TRUST */
-
- /* ..or a redirect kicked in */
- || ( NULL != (rsp = redirect_url(csp)))
- ))
- /*
- * .. or a CGI call was detected and answered.
- *
- * This check comes last to give the user the power
- * to deny acces to some (or all) of the cgi pages.
- */
- || (NULL != (rsp = dispatch_cgi(csp)))
-
- )
+ /*
+ * 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
- csp->flags |= CSP_FLAG_REJECTED;
+ if (c->flags & CF_COUNT_AS_REJECT)
+ {
+ csp->flags |= CSP_FLAG_REJECTED;
+ }
#endif /* def FEATURE_STATISTICS */
- return TRUE;
+ return TRUE;
+ }
+ }
}
return FALSE;
* 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.
*
*********************************************************************/
-void build_request_line(struct client_state *csp, const struct forward_spec *fwd)
+static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
{
struct http_request *http = csp->http;
/*
* Rebuild the request line.
- * XXX: If a http forwarder is used and the HTTP version
- * wasn't downgraded, we don't have to rebuild anything.
*/
- freez(http->cmd);
-
- http->cmd = strdup(http->gpc);
- string_append(&http->cmd, " ");
+ freez(*request_line);
+ *request_line = strdup(http->gpc);
+ string_append(request_line, " ");
if (fwd->forward_host)
{
- string_append(&http->cmd, http->url);
+ string_append(request_line, http->url);
}
else
{
- string_append(&http->cmd, http->path);
+ string_append(request_line, http->path);
}
- string_append(&http->cmd, " ");
- string_append(&http->cmd, http->ver);
+ string_append(request_line, " ");
+ string_append(request_line, http->ver);
- if (http->cmd == NULL)
+ 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", http->cmd);
+ log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
}
/*********************************************************************
*
- * 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.
+ * Function : change_request_destination
*
- * FIXME: chat is nearly thousand lines long.
- * Ridiculous.
+ * Description : Parse a (rewritten) request line and regenerate
+ * the http request data.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : Nothing.
+ * Returns : Forwards the parse_http_request() return code.
+ * Terminates in case of memory problems.
*
*********************************************************************/
-static void chat(struct client_state *csp)
+static jb_err change_request_destination(struct client_state *csp)
{
- char buf[BUFFER_SIZE];
- char *hdr;
- char *p;
- char *req;
- fd_set rfds;
- int n;
- jb_socket maxfd;
- int server_body;
- int ms_iis5_hack = 0;
- size_t 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;
- int len; /* for buffer sizes (and negative error codes) */
-#ifdef FEATURE_KILL_POPUPS
- int block_popups; /* bool, 1==will block popups */
- int block_popups_now = 0; /* bool, 1==currently blocking popups */
-#endif /* def FEATURE_KILL_POPUPS */
+ struct http_request *http = csp->http;
+ jb_err err;
- int pcrs_filter; /* bool, 1==will filter through pcrs */
- int gif_deanimate; /* bool, 1==will deanimate gifs */
- int jpeg_inspect; /* bool, 1==will inspect jpegs */
+ 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");
+ }
+ }
- /* Function that does the content filtering for the current request */
- char *(*content_filter)() = NULL;
+ return err;
+}
- /* Skeleton for HTTP response, if we should intercept the request */
- struct http_response *rsp;
- /* Temporary copy of the client's headers before they get enlisted in csp->headers */
- struct list header_list;
- struct list *headers = &header_list;
+#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);
- http = csp->http;
+ 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;
+ }
- memset(buf, 0, sizeof(buf));
+ if (csp->http->status == 304)
+ {
+ /*
+ * Expect no body. XXX: incomplete "list" of status codes?
+ */
+ csp->expected_content_length = 0;
+ content_length_known = TRUE;
+ }
- /*
- * Read the client's request. Note that since we're not using select() we
- * could get blocked here if a client connected, then didn't say anything!
- */
+ return (content_length_known && ((0 == csp->expected_content_length)
+ || (csp->expected_content_length <= content_length)));
+}
- for (;;)
+
+#ifdef FEATURE_CONNECTION_SHARING
+/*********************************************************************
+ *
+ * Function : wait_for_alive_connections
+ *
+ * Description : Waits for alive connections to timeout.
+ *
+ * Parameters : N/A
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void wait_for_alive_connections(void)
+{
+ int connections_alive = close_unusable_connections();
+
+ while (0 < connections_alive)
{
- len = read_socket(csp->cfd, buf, sizeof(buf)-1);
+ log_error(LOG_LEVEL_CONNECT,
+ "Waiting for %d connections to timeout.",
+ connections_alive);
+ sleep(60);
+ connections_alive = close_unusable_connections();
+ }
- if (len <= 0) break; /* error! */
+ log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
- if (request_contains_null_bytes(csp, buf, len))
- {
- /* NULL bytes found and dealt with, just hang up. */
- return;
- }
+}
+#endif /* def FEATURE_CONNECTION_SHARING */
- /*
- * 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;
- }
- req = get_header(csp);
+/*********************************************************************
+ *
+ * Function : save_connection_destination
+ *
+ * Description : Remembers a connection for reuse later on.
+ *
+ * Parameters :
+ * 1 : sfd = Open socket to remember.
+ * 2 : http = The destination for the connection.
+ * 3 : fwd = The forwarder settings used.
+ * 3 : server_connection = storage.
+ *
+ * Returns : void
+ *
+ *********************************************************************/
+void save_connection_destination(jb_socket sfd,
+ const struct http_request *http,
+ const struct forward_spec *fwd,
+ struct reusable_connection *server_connection)
+{
+ assert(sfd != JB_INVALID_SOCKET);
+ assert(NULL != http->host);
- if (req == NULL)
- {
- break; /* no HTTP request! */
- }
+ server_connection->sfd = sfd;
+ server_connection->host = strdup(http->host);
+ if (NULL == server_connection->host)
+ {
+ log_error(LOG_LEVEL_FATAL, "Out of memory saving socket.");
+ }
+ server_connection->port = http->port;
- if (*req == '\0')
- {
- continue; /* more to come! */
- }
+ assert(NULL != fwd);
+ assert(server_connection->gateway_host == NULL);
+ assert(server_connection->gateway_port == 0);
+ assert(server_connection->forwarder_type == 0);
+ assert(server_connection->forward_host == NULL);
+ assert(server_connection->forward_port == 0);
- /* Does the request line look invalid? */
- if (client_protocol_is_unsupported(csp, req))
+ server_connection->forwarder_type = fwd->type;
+ if (NULL != fwd->gateway_host)
+ {
+ server_connection->gateway_host = strdup(fwd->gateway_host);
+ if (NULL == server_connection->gateway_host)
{
- /*
- * Yes. The request has already been
- * answered with a error response, the buffers
- * were freed and we're done with chatting.
- */
- return;
+ log_error(LOG_LEVEL_FATAL, "Out of memory saving gateway_host.");
}
+ }
+ else
+ {
+ server_connection->gateway_host = NULL;
+ }
+ server_connection->gateway_port = fwd->gateway_port;
-#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 (NULL != fwd->forward_host)
+ {
+ server_connection->forward_host = strdup(fwd->forward_host);
+ if (NULL == server_connection->forward_host)
{
- 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;
- }
+ log_error(LOG_LEVEL_FATAL, "Out of memory saving forward_host.");
}
+ }
+ else
+ {
+ server_connection->forward_host = NULL;
+ }
+ server_connection->forward_port = fwd->forward_port;
+}
-#endif /* def FEATURE_FORCE_LOAD */
- switch( parse_http_request(req, http, csp) )
+/*********************************************************************
+ *
+ * Function : verify_request_length
+ *
+ * Description : Checks if we already got the whole client requests
+ * and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
+ * we do.
+ *
+ * Data that doesn't belong to the current request is
+ * thrown away to let the client retry on a clean socket.
+ *
+ * XXX: This is a hack until we can deal with multiple
+ * pipelined requests at the same time.
+ *
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : void
+ *
+ *********************************************************************/
+static void verify_request_length(struct client_state *csp)
+{
+ unsigned long long buffered_request_bytes =
+ (unsigned long long)(csp->iob->eod - csp->iob->cur);
+
+ if ((csp->expected_client_content_length != 0)
+ && (buffered_request_bytes != 0))
+ {
+ if (csp->expected_client_content_length >= buffered_request_bytes)
+ {
+ csp->expected_client_content_length -= buffered_request_bytes;
+ log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
+ "to account for the %llu ones we already got.",
+ csp->expected_client_content_length, buffered_request_bytes);
+ }
+ else
{
- case JB_ERR_MEMORY:
- log_error(LOG_LEVEL_ERROR, "Out of memory while parsing request.");
- break;
- case JB_ERR_PARSE:
- log_error(LOG_LEVEL_ERROR, "Couldn't parse request: %s.", req);
- break;
+ assert(csp->iob->eod > csp->iob->cur + csp->expected_client_content_length);
+ csp->iob->eod = csp->iob->cur + csp->expected_client_content_length;
+ log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
+ "Marking the server socket tainted after throwing %llu bytes away.",
+ buffered_request_bytes - csp->expected_client_content_length);
+ csp->expected_client_content_length = 0;
+ csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
}
- freez(req);
- break;
+ if (csp->expected_client_content_length == 0)
+ {
+ csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
+ }
+ }
+
+ if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
+ && ((csp->iob->cur[0] != '\0') || (csp->expected_client_content_length != 0)))
+ {
+ csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
+ if (strcmpic(csp->http->gpc, "GET")
+ && strcmpic(csp->http->gpc, "HEAD")
+ && strcmpic(csp->http->gpc, "TRACE")
+ && strcmpic(csp->http->gpc, "OPTIONS")
+ && strcmpic(csp->http->gpc, "DELETE"))
+ {
+ /* XXX: this is an incomplete hack */
+ csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
+ log_error(LOG_LEVEL_CONNECT,
+ "There might be a request body. The connection will not be kept alive.");
+ }
+ else
+ {
+ /* XXX: and so is this */
+ csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
+ log_error(LOG_LEVEL_CONNECT,
+ "Possible pipeline attempt detected. The connection will not "
+ "be kept alive and we will only serve the first request.");
+ /* Nuke the pipelined requests from orbit, just to be sure. */
+ csp->iob->buf[0] = '\0';
+ csp->iob->eod = csp->iob->cur = csp->iob->buf;
+ }
+ }
+ else
+ {
+ csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
+ log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
+ }
+}
+#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)
+ && !(csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED))
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Marking the server socket %d tainted.",
+ csp->server_connection.sfd);
+ csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
+ }
+}
+
+/*********************************************************************
+ *
+ * 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_CONNECT,
+ "Stopped waiting for the request line. Timeout: %d.",
+ csp->config->socket_timeout);
+ write_socket(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
+ strlen(CLIENT_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)
+ {
+ mark_server_socket_tainted(csp);
+ 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 */
- if (http->cmd == NULL)
+ err = parse_http_request(req, http);
+ freez(req);
+ if (JB_ERR_OK != err)
{
- strcpy(buf, CHEADER);
- write_socket(csp->cfd, buf, strlen(buf));
+ 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, "Invalid header received from %s.", 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;
+ return JB_ERR_PARSE;
}
/* grab the rest of the client's headers */
init_list(headers);
for (;;)
{
- if ( ( ( p = get_header(csp) ) != NULL) && ( *p == '\0' ) )
+ p = get_header(csp->iob);
+
+ if (p == NULL)
{
- len = read_socket(csp->cfd, buf, sizeof(buf));
+ /* 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.");
+ destroy_list(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");
- return;
+ destroy_list(headers);
+ return JB_ERR_PARSE;
}
- /*
- * 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;
+ /*
+ * 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;
}
- continue;
}
-
- if (p == NULL) break;
-
- enlist(headers, p);
- freez(p);
-
+ else
+ {
+ /*
+ * We were able to read a complete
+ * header and can finaly enlist it.
+ */
+ enlist(headers, p);
+ freez(p);
+ }
}
if (http->host == NULL)
* An error response has already been send
* and we're done here.
*/
- return;
+ return JB_ERR_PARSE;
}
}
- /* decide how to route the HTTP request */
+ /*
+ * 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;
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
+ && (!strcmpic(csp->http->ver, "HTTP/1.1"))
+ && (csp->http->ssl == 0))
+ {
+ /* Assume persistence until further notice */
+ csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ 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;
+ }
- if ((fwd = forward_url(http, csp)) == NULL)
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (csp->http->ssl == 0)
+ {
+ verify_request_length(csp);
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ 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;
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ int watch_client_socket = 1;
+#endif
+
+ 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
+ /*
+ * 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
*
*/
- /*
- * 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 */
- {
- url_actions(http, csp);
- }
-
-
- /*
- * Check if a CONNECT request is allowable:
- * In the absence of a +limit-connect action, allow only port 443.
- * If there is an action, allow whatever matches the specificaton.
- */
- if(http->ssl)
- {
- if( ( !(csp->action->flags & ACTION_LIMIT_CONNECT) && csp->http->port != 443)
- || (csp->action->flags & ACTION_LIMIT_CONNECT
- && !match_portlist(csp->action->string[ACTION_STRING_LIMIT_CONNECT], csp->http->port)) )
- {
- if (csp->action->flags & ACTION_TREAT_FORBIDDEN_CONNECTS_LIKE_BLOCKS)
- {
- /*
- * The response may confuse some clients,
- * but makes unblocking easier.
- */
- log_error(LOG_LEVEL_ERROR, "Marking suspicious CONNECT request from %s for blocking.",
- csp->ip_addr_str);
- csp->action->flags |= ACTION_BLOCK;
- http->ssl = 0;
- }
- else
- {
- strcpy(buf, CFORBIDDEN);
- write_socket(csp->cfd, buf, strlen(buf));
- log_error(LOG_LEVEL_CONNECT, "Denying suspicious CONNECT request from %s", csp->ip_addr_str);
- log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 403 0", csp->ip_addr_str);
- return;
- }
- }
- }
-
-
- /*
- * Save a copy of the original request for logging
- */
- http->ocmd = strdup(http->cmd);
-
- if (http->ocmd == NULL)
+ if (http->ssl && connect_port_is_forbidden(csp))
{
- log_error(LOG_LEVEL_FATAL, "Out of memory copying HTTP request line");
+ 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;
}
- /*
- * (Re)build the HTTP request for non-SSL requests.
- */
if (http->ssl == 0)
{
- build_request_line(csp, fwd);
- }
- enlist(csp->headers, http->cmd);
-
- /* Append the previously read headers */
- list_append_list_unique(csp->headers, headers);
- destroy_list(headers);
-
- /*
- * If the user has not supplied any wafers, and the user has not
- * told us to suppress the vanilla wafer, then send the vanilla wafer.
- */
- if (list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
- && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
- {
- enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
- }
-
- hdr = sed(client_patterns, add_client_headers, csp);
- if (hdr == NULL)
- {
- /* FIXME Should handle error properly */
- log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
+ freez(csp->headers->first->str);
+ build_request_line(csp, fwd, &csp->headers->first->str);
}
- csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
-
-#ifdef FEATURE_KILL_POPUPS
- block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
-#endif /* def FEATURE_KILL_POPUPS */
-
- pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
- (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER]));
-
- gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
-
- jpeg_inspect = ((csp->action->flags & ACTION_JPEG_INSPECT) != 0);
/*
* We have a request. Check if one of the crunchers wants it.
*/
- if (crunch_response_triggered(csp))
+ if (crunch_response_triggered(csp, crunchers_all))
{
/*
* Yes. The client got the crunch response
* and we are done here after cleaning up.
*/
- freez(hdr);
+ /* XXX: why list_remove_all()? */
list_remove_all(csp->headers);
return;
}
- /*
- * The headers can't be removed earlier because
- * they were still needed for the referrer check
- * in case of CGI crunches.
- *
- * XXX: Would it be worth to move the referrer check
- * into client_referrer() and set a flag if it's trusted?
- */
- list_remove_all(csp->headers);
-
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);
+ log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
+ fwd->forward_host, fwd->forward_port, http->hostport);
}
else
{
/* 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))
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
+ && socket_is_still_usable(csp->server_connection.sfd)
+ && connection_destination_matches(&csp->server_connection, http, fwd))
{
- log_error(LOG_LEVEL_ERROR, "failed request #%u to connect to %s. Trying again.",
- forwarded_connect_retries, http->hostport);
+ log_error(LOG_LEVEL_CONNECT,
+ "Reusing server socket %u. Opened for %s.",
+ csp->server_connection.sfd, csp->server_connection.host);
}
-
- if (csp->sfd == JB_INVALID_SOCKET)
+ else
{
- if (fwd->type != SOCKS_NONE)
+ if (csp->server_connection.sfd != JB_INVALID_SOCKET)
{
- /* Socks error. */
- rsp = error_response(csp, "forwarding-failed", errno);
+ log_error(LOG_LEVEL_CONNECT,
+ "Closing server socket %u. Opened for %s.",
+ csp->server_connection.sfd, csp->server_connection.host);
+ close_socket(csp->server_connection.sfd);
+ mark_connection_closed(&csp->server_connection);
}
- else if (errno == EINVAL)
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ while ((csp->server_connection.sfd = forwarded_connect(fwd, http, csp))
+ && (errno == EINVAL)
+ && (forwarded_connect_retries++ < max_forwarded_connect_retries))
{
- rsp = error_response(csp, "no-such-domain", errno);
+ log_error(LOG_LEVEL_ERROR,
+ "failed request #%u to connect to %s. Trying again.",
+ forwarded_connect_retries, http->hostport);
}
- else
+
+ if (csp->server_connection.sfd == JB_INVALID_SOCKET)
{
- rsp = error_response(csp, "connect-failed", errno);
- log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
- http->hostport);
- }
+ if (fwd->type != SOCKS_NONE)
+ {
+ /* Socks error. */
+ rsp = error_response(csp, "forwarding-failed");
+ }
+ else if (errno == EINVAL)
+ {
+ rsp = error_response(csp, "no-such-domain");
+ }
+ else
+ {
+ rsp = error_response(csp, "connect-failed");
+ 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);
+ }
- /* Write the answer to the client */
- if(rsp != NULL)
- {
- send_crunch_response(csp, rsp);
+ return;
}
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ save_connection_destination(csp->server_connection.sfd,
+ http, fwd, &csp->server_connection);
+ csp->server_connection.keep_alive_timeout =
+ (unsigned)csp->config->keep_alive_timeout;
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
- freez(hdr);
- 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
+ /*
+ * 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) < 0))
+ if (write_socket(csp->server_connection.sfd, hdr, strlen(hdr))
+ || (flush_socket(csp->server_connection.sfd, csp->iob) < 0))
{
- log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
- http->hostport);
-
- rsp = error_response(csp, "connect-failed", errno);
+ log_error(LOG_LEVEL_CONNECT,
+ "write header to: %s failed: %E", http->hostport);
- if(rsp)
+ rsp = error_response(csp, "connect-failed");
+ if (rsp)
{
send_crunch_response(csp, rsp);
}
* 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, sizeof(CSUCCEED)-1))
+ if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
{
freez(hdr);
return;
log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
+ csp->server_connection.request_sent = time(NULL);
+
/* we're finished with the client's header */
freez(hdr);
- maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
+ maxfd = (csp->cfd > csp->server_connection.sfd) ?
+ csp->cfd : csp->server_connection.sfd;
/* pass data between the client and server
* until one or the other shuts down the connection.
#else
FD_ZERO(&rfds);
#endif
- FD_SET(csp->cfd, &rfds);
- FD_SET(csp->sfd, &rfds);
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (!watch_client_socket)
+ {
+ maxfd = csp->server_connection.sfd;
+ }
+ else
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+ {
+ FD_SET(csp->cfd, &rfds);
+ }
+
+ FD_SET(csp->server_connection.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))
+ {
+ if (csp->expected_content_length == byte_count)
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Done reading from server. Content length: %llu as expected. "
+ "Bytes most recently read: %d.",
+ byte_count, len);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Done reading from server. Expected content length: %llu. "
+ "Actual content length: %llu. Bytes most recently read: %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 */
- n = select((int)maxfd+1, &rfds, NULL, NULL, NULL);
+ timeout.tv_sec = csp->config->socket_timeout;
+ timeout.tv_usec = 0;
+ n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
- if (n < 0)
+ if (n == 0)
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Didn't receive data in time: %s", http->url);
+ if ((byte_count == 0) && (http->ssl == 0))
+ {
+ send_crunch_response(csp, error_response(csp, "connection-timeout"));
+ }
+ 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 it and write it.
+ /*
+ * This is the body of the browser's request,
+ * just read and write it.
+ *
+ * XXX: Make sure the client doesn't use pipelining
+ * behind Privoxy's back.
*/
-
if (FD_ISSET(csp->cfd, &rfds))
{
- len = read_socket(csp->cfd, buf, sizeof(buf));
+ int max_bytes_to_read = sizeof(buf) - 1;
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
+ {
+ if (data_is_available(csp->cfd, 0))
+ {
+ /*
+ * If the next request is already waiting, we have
+ * to stop select()ing the client socket. Otherwise
+ * we would always return right away and get nothing
+ * else done.
+ */
+ watch_client_socket = 0;
+ log_error(LOG_LEVEL_CONNECT,
+ "Stopping to watch the client socket. "
+ "There's already another request waiting.");
+ continue;
+ }
+ /*
+ * If the client socket is set, but there's no data
+ * available on the socket, the client went fishing
+ * and continuing talking to the server makes no sense.
+ */
+ log_error(LOG_LEVEL_CONNECT,
+ "The client closed socket %d while "
+ "the server socket %d is still open.",
+ csp->cfd, csp->server_connection.sfd);
+ mark_server_socket_tainted(csp);
+ break;
+ }
+ if (csp->expected_client_content_length != 0)
+ {
+ if (csp->expected_client_content_length < (sizeof(buf) - 1))
+ {
+ max_bytes_to_read = (int)csp->expected_client_content_length;
+ }
+ log_error(LOG_LEVEL_CONNECT,
+ "Waiting for up to %d bytes from the client.",
+ max_bytes_to_read);
+ }
+ assert(max_bytes_to_read < sizeof(buf));
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ len = read_socket(csp->cfd, buf, max_bytes_to_read);
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))
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (csp->expected_client_content_length != 0)
+ {
+ assert(len <= max_bytes_to_read);
+ csp->expected_client_content_length -= (unsigned)len;
+ log_error(LOG_LEVEL_CONNECT,
+ "Expected client content length set to %llu "
+ "after reading %d bytes.",
+ csp->expected_client_content_length, len);
+ if (csp->expected_client_content_length == 0)
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Done reading from the client.");
+ csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
+ }
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ if (write_socket(csp->server_connection.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.
+ * 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))
+ if (FD_ISSET(csp->server_connection.sfd, &rfds))
{
- fflush( 0 );
- len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (!socket_is_still_usable(csp->cfd))
+ {
+#ifdef _WIN32
+ log_error(LOG_LEVEL_CONNECT,
+ "The server still wants to talk, but the client may already have hung up on us.");
+#else
+ log_error(LOG_LEVEL_CONNECT,
+ "The server still wants to talk, but the client hung up on us.");
+ mark_server_socket_tainted(csp);
+ return;
+#endif /* def _WIN32 */
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ fflush(NULL);
+ len = read_socket(csp->server_connection.sfd, buf, sizeof(buf) - 1);
if (len < 0)
{
"CONNECT already confirmed. Unable to tell the client about the problem.");
return;
}
-
- rsp = error_response(csp, "connect-failed", errno);
-
- if(rsp)
+ else if (byte_count)
{
- send_crunch_response(csp, rsp);
+ /*
+ * 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;
}
+ /*
+ * XXX: Consider handling the cases above the same.
+ */
+ mark_server_socket_tainted(csp);
+ len = 0;
+ }
- 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. This lets filter_popups
- * use string operations.
+ /*
+ * 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';
-#ifdef FEATURE_KILL_POPUPS
- /* Filter the popups on this read. */
- if (block_popups_now)
- {
- filter_popups(buf, csp);
- }
-#endif /* def FEATURE_KILL_POPUPS */
-
- /* Normally, this would indicate that we've read
+ /*
+ * 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
*/
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 = (*content_filter)(csp)))
+ if (NULL == p)
{
csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
}
- hdr = sed(server_patterns_light, NULL, csp);
+ 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 */
}
if (write_socket(csp->cfd, hdr, strlen(hdr))
- || write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length))
+ || 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;
}
* 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 (add_to_iob(csp, buf, len))
{
size_t hdrlen;
- int flushed;
+ long flushed;
- log_error(LOG_LEVEL_ERROR, "Flushing header and buffers. Stepping back from filtering.");
+ log_error(LOG_LEVEL_INFO,
+ "Flushing header and buffers. Stepping back from filtering.");
- hdr = sed(server_patterns, add_server_headers, csp);
+ hdr = list_to_text(csp->headers);
if (hdr == NULL)
{
/*
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)) < 0)
+ || ((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");
-
+ log_error(LOG_LEVEL_CONNECT,
+ "Flush header and buffers to client failed: %E");
freez(hdr);
+ mark_server_socket_tainted(csp);
return;
}
- byte_count += hdrlen + (size_t)flushed + (size_t)len;
+ /*
+ * 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 += (size_t)len;
+ byte_count += (unsigned long long)len;
continue;
}
else
{
- /* we're still looking for the end of the
- * server's header ... (does that make header
- * parsing an "out of body experience" ?
- */
-
- /*
- * buffer up the data we just read. If that fails,
- * there's little we can do but send our static
- * out-of-memory page.
+ /*
+ * 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;
}
{
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
+ /*
+ * 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.
*/
- break;
+ log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
+ "Applying the MS IIS5 hack didn't help.");
+ 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));
+ mark_server_socket_tainted(csp);
+ return;
+ }
+ else
+ {
+ /*
+ * Since we have to wait for more from the server before
+ * we can parse the headers we just continue here.
+ */
+ log_error(LOG_LEVEL_CONNECT,
+ "Continuing buffering headers. Bytes most recently read: %d.",
+ len);
+ continue;
+ }
+ }
+ else
+ {
+ /*
+ * Account for the content bytes we
+ * might have gotten with the headers.
+ */
+ assert(csp->iob->eod >= csp->iob->cur);
+ byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
+ }
+
+ /* Did we actually get anything? */
+ if (NULL == csp->headers->first)
+ {
+ if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Empty server or forwarder response received on socket %d. "
+ "Closing client connection %d without sending data.",
+ csp->server_connection.sfd, csp->cfd);
}
else
{
- /* Since we have to wait for
- * more from the server before
- * we can parse the headers
- * we just continue here.
- */
- continue;
+ log_error(LOG_LEVEL_ERROR,
+ "Empty server or forwarder response received on socket %d.",
+ csp->server_connection.sfd);
+ send_crunch_response(csp, error_response(csp, "no-server-data"));
}
+ log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
+ free_http_request(http);
+ mark_server_socket_tainted(csp);
+ return;
}
- /* Did we actually get anything? */
- if (NULL == csp->headers->first)
+ assert(csp->headers->first->str);
+ assert(!http->ssl);
+ if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
+ strncmpic(csp->headers->first->str, "ICY", 3))
{
- 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);
- strcpy(buf, NO_SERVER_DATA_RESPONSE);
- write_socket(csp->cfd, buf, strlen(buf));
+ /*
+ * 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 header.
+ /*
+ * We have now received the entire server header,
* filter it and send the result to the client
*/
-
- hdr = sed(server_patterns, add_server_headers, csp);
+ 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");
}
-#ifdef FEATURE_KILL_POPUPS
- /* Start blocking popups if appropriate. */
+ csp->server_connection.response_received = time(NULL);
- if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
- !http->ssl && /* We talk plaintext */
- block_popups) /* Policy allows */
+ if (crunch_response_triggered(csp, crunchers_light))
{
- block_popups_now = 1;
/*
- * Filter the part of the body that came in the same read
- * as the last headers:
+ * 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.
*/
- filter_popups(csp->iob->cur, csp);
+ freez(hdr);
+ mark_server_socket_tainted(csp);
+ return;
}
-
-#endif /* def FEATURE_KILL_POPUPS */
-
/* Buffer and pcrs filter this if appropriate. */
- if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
- !http->ssl && /* We talk plaintext */
- pcrs_filter) /* Policy allows */
- {
- content_filter = pcrs_filter_response;
- }
-
- /* Buffer and gif_deanimate this if appropriate. */
-
- if ((csp->content_type & CT_GIF) && /* It's an image/gif MIME-Type */
- !http->ssl && /* We talk plaintext */
- gif_deanimate) /* Policy allows */
+ if (!http->ssl) /* We talk plaintext */
{
- content_filter = gif_deanimate_response;
+ content_filter = get_filter_function(csp);
}
-
- /* Buffer and jpg_inspect this if appropriate. */
-
- if ((csp->content_type & CT_JPEG) && /* It's an image/jpeg MIME-Type */
- !http->ssl && /* We talk plaintext */
- jpeg_inspect) /* Policy allows */
- {
- content_filter = jpeg_inspect_response;
- }
-
/*
* Only write if we're not buffering for content modification
*/
if (!content_filter)
{
- /* write the server's (modified) header to
+ /*
+ * 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)) < 0))
+ || ((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.
+ /*
+ * 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 += (size_t)len;
}
/* 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 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)
{
- break;
+ log_error(LOG_LEVEL_ERROR,
+ "Closed server connection detected. "
+ "Applying the MS IIS5 hack didn't help.");
+ 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));
+ mark_server_socket_tainted(csp);
+ return;
}
}
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.
+ * If Privoxy didn't recalculate the Content-Lenght,
+ * byte_count is still correct.
*/
csp->content_length = byte_count;
}
- log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
+#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);
+
+ csp->server_connection.timestamp = time(NULL);
}
* Function : serve
*
* Description : This is little more than chat. We only "serve" to
- * to close any socket that chat may have opened.
+ * to close (or remember) any socket that chat may have
+ * opened.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
static void serve(struct client_state *csp)
#endif /* def AMIGA */
{
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+#ifdef FEATURE_CONNECTION_SHARING
+ static int monitor_thread_running = 0;
+#endif /* def FEATURE_CONNECTION_SHARING */
+ int continue_chatting = 0;
+
+ do
+ {
+ unsigned int latency;
+
+ chat(csp);
+
+ latency = (unsigned)(csp->server_connection.response_received -
+ csp->server_connection.request_sent) / 2;
+
+ continue_chatting = (csp->config->feature_flags
+ & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
+ && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
+ && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
+ && (csp->cfd != JB_INVALID_SOCKET)
+ && (csp->server_connection.sfd != JB_INVALID_SOCKET)
+ && socket_is_still_usable(csp->server_connection.sfd);
+
+ if (continue_chatting)
+ {
+ if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
+ {
+ csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
+ log_error(LOG_LEVEL_CONNECT,
+ "The server didn't specify how long the connection will stay open. "
+ "Assumed timeout is: %u.", csp->server_connection.keep_alive_timeout);
+ }
+ continue_chatting = (latency < csp->server_connection.keep_alive_timeout);
+ }
+
+ if (continue_chatting)
+ {
+ unsigned int client_timeout;
+
+ client_timeout = (unsigned)csp->server_connection.keep_alive_timeout - latency;
+
+ log_error(LOG_LEVEL_CONNECT,
+ "Waiting for the next client request on socket %d. "
+ "Keeping the server socket %d to %s open.",
+ csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
+ if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
+ && data_is_available(csp->cfd, (int)client_timeout)
+ && socket_is_still_usable(csp->cfd))
+ {
+ log_error(LOG_LEVEL_CONNECT, "Client request arrived in "
+ "time or the client closed the connection on socket %d.",
+ csp->cfd);
+ /*
+ * Get the csp in a mostly vergin state again.
+ * XXX: Should be done elsewhere.
+ */
+ csp->content_type = 0;
+ csp->content_length = 0;
+ csp->expected_content_length = 0;
+ csp->expected_client_content_length = 0;
+ list_remove_all(csp->headers);
+ freez(csp->iob->buf);
+ memset(csp->iob, 0, sizeof(csp->iob));
+ freez(csp->error_message);
+ free_http_request(csp->http);
+ destroy_list(csp->headers);
+ destroy_list(csp->tags);
+ free_current_action(csp->action);
+ if (NULL != csp->fwd)
+ {
+ unload_forward_spec(csp->fwd);
+ csp->fwd = NULL;
+ }
+
+ /* XXX: Store per-connection flags someplace else. */
+ csp->flags = CSP_FLAG_ACTIVE |
+ (csp->flags & CSP_FLAG_TOGGLED_ON) | CSP_FLAG_REUSED_CLIENT_CONNECTION;
+ }
+ else
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "No additional client request received in time on socket %d.",
+ csp->cfd);
+#ifdef FEATURE_CONNECTION_SHARING
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
+ && (socket_is_still_usable(csp->server_connection.sfd)))
+ {
+ time_t time_open = time(NULL) - csp->server_connection.timestamp;
+
+ if (csp->server_connection.keep_alive_timeout < time_open + latency)
+ {
+ break;
+ }
+
+ remember_connection(&csp->server_connection);
+ csp->server_connection.sfd = JB_INVALID_SOCKET;
+ close_socket(csp->cfd);
+ csp->cfd = JB_INVALID_SOCKET;
+ 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);
+ }
+#endif /* def FEATURE_CONNECTION_SHARING */
+ break;
+ }
+ }
+ else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "The connection on server socket %d to %s isn't reusable. "
+ "Closing.", csp->server_connection.sfd, csp->server_connection.host);
+ }
+ } while (continue_chatting);
+
+#else
chat(csp);
- close_socket(csp->cfd);
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ if (csp->server_connection.sfd != JB_INVALID_SOCKET)
+ {
+#ifdef FEATURE_CONNECTION_SHARING
+ if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
+ {
+ forget_connection(csp->server_connection.sfd);
+ }
+#endif /* def FEATURE_CONNECTION_SHARING */
+ close_socket(csp->server_connection.sfd);
+ }
- if (csp->sfd != JB_INVALID_SOCKET)
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ mark_connection_closed(&csp->server_connection);
+#endif
+
+ if (csp->cfd != JB_INVALID_SOCKET)
{
- close_socket(csp->sfd);
+ close_socket(csp->cfd);
}
csp->flags &= ~CSP_FLAG_ACTIVE;
#endif
+#if !defined(_WIN32) || defined(_WIN_CONSOLE)
/*********************************************************************
*
* Function : usage
* Returns : No. ,-)
*
*********************************************************************/
-void usage(const char *myname)
+static void usage(const char *myname)
{
printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
-#if !defined(unix)
- "Usage: %s [--help] [--version] [configfile]\n"
-#else
- "Usage: %s [--help] [--version] [--no-daemon] [--pidfile pidfile] [--user user[.group]] [configfile]\n"
-#endif
- "Aborting.\n", myname);
-
+ "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
* Returns : Void, exits in case of errors.
*
*********************************************************************/
-void initialize_mutexes()
+static void initialize_mutexes(void)
{
- int err = 0;
-
-#ifdef FEATURE_PTHREAD
+#ifdef MUTEX_LOCKS_AVAILABLE
/*
* Prepare global mutex semaphores
*/
- err = pthread_mutex_init(&log_mutex, 0);
-
- if (!err) err = pthread_mutex_init(&log_init_mutex, 0);
+ 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
*
* For example older FreeBSD versions (< 6.x?)
* have no gethostbyname_r, but gethostbyname is
- * thead safe.
+ * 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
- if (!err) err = pthread_mutex_init(&gmtime_mutex, 0);
+ privoxy_mutex_init(&gmtime_mutex);
#endif /* ndef HAVE_GMTIME_R */
#ifndef HAVE_LOCALTIME_R
- if (!err) err = pthread_mutex_init(&localtime_mutex, 0);
+ privoxy_mutex_init(&localtime_mutex);
#endif /* ndef HAVE_GMTIME_R */
-#ifndef HAVE_GETHOSTBYADDR_R
- if (!err) err = pthread_mutex_init(&gethostbyaddr_mutex, 0);
-#endif /* ndef HAVE_GETHOSTBYADDR_R */
-
-#ifndef HAVE_GETHOSTBYNAME_R
- if (!err) err = pthread_mutex_init(&gethostbyname_mutex, 0);
-#endif /* ndef HAVE_GETHOSTBYNAME_R */
-
#ifndef HAVE_RANDOM
- if (!err) err = pthread_mutex_init(&rand_mutex, 0);
+ privoxy_mutex_init(&rand_mutex);
#endif /* ndef HAVE_RANDOM */
-#endif /* FEATURE_PTHREAD */
-
- /*
- * TODO: mutex support for mingw32 would be swell.
- */
-
- if (err)
- {
- printf("Fatal error. Mutex initialization failed: %s.\n",
- strerror(err));
- exit(1);
- }
-
- return;
+#endif /* def MUTEX_LOCKS_AVAILABLE */
}
*
*********************************************************************/
#ifdef __MINGW32__
-int real_main(int argc, const char *argv[])
+int real_main(int argc, char **argv)
#else
-int main(int argc, const char *argv[])
+int main(int argc, char **argv)
#endif
{
int argc_pos = 0;
struct group *grp = NULL;
char *p;
int do_chroot = 0;
+ char *pre_chroot_nslookup_to_load_resolver = NULL;
#endif
Argc = argc;
#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)
{
else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
{
- no_daemon = 1;
+ set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
+ daemon_mode = 0;
}
else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
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 *abs_file, cwd[1024];
+ char cwd[BUFFER_SIZE];
+ char *abs_file;
+ size_t abs_file_size;
/* make config-filename absolute here */
- if ( !(getcwd(cwd, sizeof(cwd))))
+ if (NULL == getcwd(cwd, sizeof(cwd)))
{
- perror("get working dir failed");
+ perror("failed to get current working directory");
exit( 1 );
}
- if (!(basedir = strdup(cwd))
- || (!(abs_file = malloc( strlen( basedir ) + strlen( configfile ) + 5 ))))
+ /* 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 );
}
- strcpy( abs_file, basedir );
- strcat( abs_file, "/" );
- strcat( abs_file, configfile );
+ 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
- /* Prepare mutexes if supported and necessary. */
- initialize_mutexes();
-
random_seed = (unsigned int)time(NULL);
#ifdef HAVE_RANDOM
srandom(random_seed);
#if defined(unix)
{
pid_t pid = 0;
-#if 0
- int fd;
-#endif
- if (!no_daemon)
+ if (daemon_mode)
{
+ int fd;
+
pid = fork();
if ( pid < 0 ) /* error */
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 */
- /* FIXME: should close stderr (fd 2) here too, but the test
- * for existence
- * and load config file is done in listen_loop() and puts
- * some messages on stderr there.
+
+ /*
+ * stderr (fd 2) will be closed later on,
+ * when the config file has been parsed.
+ */
+ close(0);
+ close(1);
+
+ /*
+ * Reserve fd 0 and 1 to prevent abort() and friends
+ * from sending stuff to the clients or servers.
*/
+ fd = open("/dev/null", O_RDONLY);
+ if (fd == -1)
+ {
+ log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
+ }
+ else if (fd != 0)
+ {
+ if (dup2(fd, 0) == -1)
+ {
+ log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
+ }
+ close(fd);
+ }
+ fd = open("/dev/null", O_WRONLY);
+ if (fd == -1)
+ {
+ log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
+ }
+ else if (fd != 1)
+ {
+ if (dup2(fd, 1) == -1)
+ {
+ log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
+ }
+ close(fd);
+ }
- close( 0 );
- close( 1 );
chdir("/");
- } /* -END- if (!no_daemon) */
+ } /* -END- if (daemon_mode) */
/*
* As soon as we have written the PID file, we can switch
{
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);
{
char putenv_dummy[64];
- strcpy(putenv_dummy, "HOME=/");
+ strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
if (putenv(putenv_dummy) != 0)
{
log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
}
- snprintf(putenv_dummy, 64, "USER=%s", pw->pw_name);
+ snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
if (putenv(putenv_dummy) != 0)
{
log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
int result;
jb_socket bfd;
- if ( (config->haddr != NULL)
- && (config->haddr[0] == '1')
- && (config->haddr[1] == '2')
- && (config->haddr[2] == '7')
- && (config->haddr[3] == '.') )
- {
- log_error(LOG_LEVEL_INFO, "Listening on port %d for local connections only",
- config->hport);
- }
- else if (config->haddr == NULL)
+ if (config->haddr == NULL)
{
log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
config->hport);
(NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
default :
- log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
+ log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
(NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
}
{
struct client_state *csp = NULL;
jb_socket bfd;
- struct configuration_spec * config;
+ struct configuration_spec *config;
+ unsigned int active_threads = 0;
config = load_config();
+#ifdef FEATURE_CONNECTION_SHARING
+ /*
+ * XXX: Should be relocated once it no
+ * longer needs to emit log messages.
+ */
+ initialize_reusable_connections();
+#endif /* def FEATURE_CONNECTION_SHARING */
+
bfd = bind_port_helper(config);
#ifdef FEATURE_GRACEFUL_TERMINATION
/*
* Free data that was used by died threads
*/
- sweep();
+ active_threads = sweep();
#if defined(unix)
/*
*/
if (received_hup_signal)
{
- init_error_log(Argv[0], config->logfile, config->debug);
+ if (NULL != config->logfile)
+ {
+ init_error_log(Argv[0], config->logfile);
+ }
received_hup_signal = 0;
}
#endif
-#ifdef __OS2__
-#ifdef FEATURE_COOKIE_JAR
- /*
- * Need a workaround here: we have to fclose() the jarfile, or we die because it's
- * already open. I think unload_configfile() is not being run, which should do
- * this work. Until that can get resolved, we'll use this workaround.
- */
- if (csp)
- if(csp->config)
- if (csp->config->jar)
- {
- fclose(csp->config->jar);
- csp->config->jar = NULL;
- }
-#endif /* FEATURE_COOKIE_JAR */
-#endif /* __OS2__ */
-
if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
{
log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
}
csp->flags |= CSP_FLAG_ACTIVE;
- csp->sfd = JB_INVALID_SOCKET;
+ csp->server_connection.sfd = JB_INVALID_SOCKET;
csp->config = config = load_config();
{
/*
* Since we were listening to the "old port", we will not see
- * a "listen" param change until the next IJB request. So, at
+ * a "listen" param change until the next 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.
#ifdef FEATURE_TOGGLE
if (global_toggle_state)
+#endif /* def FEATURE_TOGGLE */
{
csp->flags |= CSP_FLAG_TOGGLED_ON;
}
-#endif /* def FEATURE_TOGGLE */
if (run_loader(csp))
{
{
log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
close_socket(csp->cfd);
+ freez(csp->ip_addr_str);
freez(csp);
continue;
}
#endif /* def FEATURE_ACL */
+ if ((0 != config->max_client_connections)
+ && (active_threads >= config->max_client_connections))
+ {
+ log_error(LOG_LEVEL_CONNECT,
+ "Rejecting connection from %s. Maximum number of connections reached.",
+ csp->ip_addr_str);
+ write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
+ strlen(TOO_MANY_CONNECTIONS_RESPONSE));
+ close_socket(csp->cfd);
+ freez(csp->ip_addr_str);
+ freez(csp);
+ continue;
+ }
+
/* add it to the list of clients */
csp->next = clients->next;
clients->next = csp;
#undef SELECTED_ONE_OPTION
/* end of cpp switch () */
- if (child_id < 0) /* failed */
+ if (child_id < 0)
{
- 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));
+ /*
+ * Spawning the child failed, assume it's because
+ * there are too many children running already.
+ * XXX: If you assume ...
+ */
+ log_error(LOG_LEVEL_ERROR,
+ "Unable to take any additional connections: %E");
+ write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
+ strlen(TOO_MANY_CONNECTIONS_RESPONSE));
close_socket(csp->cfd);
csp->flags &= ~CSP_FLAG_ACTIVE;
- sleep(5);
- continue;
}
}
else
#endif
freez(configfile);
-#ifdef FEATURE_COOKIE_JAR
- if (NULL != config->jar)
- {
- fclose(config->jar);
- }
-#endif
-
#if defined(_WIN32) && !defined(_WIN_CONSOLE)
/* Cleanup - remove taskbar icon etc. */
TermLogWindow();
projects / privoxy.git / blobdiff