+ * Revision 1.103 2007/06/01 16:31:54 fabiankeil
+ * Change sed() to return a jb_err in preparation for forward-override{}.
+ *
+ * Revision 1.102 2007/05/27 12:39:32 fabiankeil
+ * Adjust "X-Filter: No" to disable dedicated header filters.
+ *
+ * Revision 1.101 2007/05/14 10:16:41 fabiankeil
+ * Streamline client_cookie_adder().
+ *
+ * Revision 1.100 2007/04/30 15:53:11 fabiankeil
+ * Make sure filters with dynamic jobs actually use them.
+ *
+ * Revision 1.99 2007/04/30 15:06:26 fabiankeil
+ * - Introduce dynamic pcrs jobs that can resolve variables.
+ * - Remove unnecessary update_action_bits_for_all_tags() call.
+ *
+ * Revision 1.98 2007/04/17 18:32:10 fabiankeil
+ * - Make tagging based on tags set by earlier taggers
+ * of the same kind possible.
+ * - Log whether or not new tags cause action bits updates
+ * (in which case a matching tag-pattern section exists).
+ * - Log if the user tries to set a tag that is already set.
+ *
+ * Revision 1.97 2007/04/15 16:39:21 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 1.96 2007/04/12 12:53:58 fabiankeil
+ * Log a warning if the content is compressed, filtering is
+ * enabled and Privoxy was compiled without zlib support.
+ * Closes FR#1673938.
+ *
+ * Revision 1.95 2007/03/25 14:26:40 fabiankeil
+ * - Fix warnings when compiled with glibc.
+ * - Don't use crumble() for cookie crunching.
+ * - Move cookie time parsing into parse_header_time().
+ * - Let parse_header_time() return a jb_err code
+ * instead of a pointer that can only be used to
+ * check for NULL anyway.
+ *
+ * Revision 1.94 2007/03/21 12:23:53 fabiankeil
+ * - Add better protection against malicious gzip headers.
+ * - Stop logging the first hundred bytes of decompressed content.
+ * It looks like it's working and there is always debug 16.
+ * - Log the content size after decompression in decompress_iob()
+ * instead of pcrs_filter_response().
+ *
+ * Revision 1.93 2007/03/20 15:21:44 fabiankeil
+ * - Use dedicated header filter actions instead of abusing "filter".
+ * Replace "filter-client-headers" and "filter-client-headers"
+ * with "server-header-filter" and "client-header-filter".
+ * - Remove filter_client_header() and filter_client_header(),
+ * filter_header() now checks the shiny new
+ * CSP_FLAG_CLIENT_HEADER_PARSING_DONE flag instead.
+ *
+ * Revision 1.92 2007/03/05 13:25:32 fabiankeil
+ * - Cosmetical changes for LOG_LEVEL_RE_FILTER messages.
+ * - Handle "Cookie:" and "Connection:" headers a bit smarter
+ * (don't crunch them just to recreate them later on).
+ * - Add another non-standard time format for the cookie
+ * expiration date detection.
+ * - Fix a valgrind warning.
+ *
+ * Revision 1.91 2007/02/24 12:27:32 fabiankeil
+ * Improve cookie expiration date detection.
+ *
+ * Revision 1.90 2007/02/08 19:12:35 fabiankeil
+ * Don't run server_content_length() the first time
+ * sed() parses server headers; only adjust the
+ * Content-Length header if the page was modified.
+ *
+ * Revision 1.89 2007/02/07 16:52:11 fabiankeil
+ * Fix log messages regarding the cookie time format
+ * (cookie and request URL were mixed up).
+ *
+ * Revision 1.88 2007/02/07 11:27:12 fabiankeil
+ * - Let decompress_iob()
+ * - not corrupt the content if decompression fails
+ * early. (the first byte(s) were lost).
+ * - use pointer arithmetics with defined outcome for
+ * a change.
+ * - Use a different kludge to remember a failed decompression.
+ *
+ * Revision 1.87 2007/01/31 16:21:38 fabiankeil
+ * Search for Max-Forwards headers case-insensitive,
+ * don't generate the "501 unsupported" message for invalid
+ * Max-Forwards values and don't increase negative ones.
+ *
+ * Revision 1.86 2007/01/30 13:05:26 fabiankeil
+ * - Let server_set_cookie() check the expiration date
+ * of cookies and don't touch the ones that are already
+ * expired. Fixes problems with low quality web applications
+ * as described in BR 932612.
+ *
+ * - Adjust comment in client_max_forwards to reality;
+ * remove invalid Max-Forwards headers.
+ *
+ * Revision 1.85 2007/01/26 15:33:46 fabiankeil
+ * Stop filter_header() from unintentionally removing
+ * empty header lines that were enlisted by the continue
+ * hack.
+ *
+ * Revision 1.84 2007/01/24 12:56:52 fabiankeil
+ * - Repeat the request URL before logging any headers.
+ * Makes reading the log easier in case of simultaneous requests.
+ * - If there are more than one Content-Type headers in one request,
+ * use the first one and remove the others.
+ * - Remove "newval" variable in server_content_type().
+ * It's only used once.
+ *
+ * Revision 1.83 2007/01/12 15:03:02 fabiankeil
+ * Correct a cast, check inflateEnd() exit code
+ * to see if we have to, replace sprintf calls
+ * with snprintf.
+ *
+ * Revision 1.82 2007/01/01 19:36:37 fabiankeil
+ * Integrate a modified version of Wil Mahan's
+ * zlib patch (PR #895531).
+ *
+ * Revision 1.81 2006/12/31 22:21:33 fabiankeil
+ * Skip empty filter files in filter_header()
+ * but don't ignore the ones that come afterwards.
+ * Fixes BR 1619208, this time for real.
+ *
+ * Revision 1.80 2006/12/29 19:08:22 fabiankeil
+ * Reverted parts of my last commit
+ * to keep error handling working.
+ *
+ * Revision 1.79 2006/12/29 18:04:40 fabiankeil
+ * Fixed gcc43 conversion warnings.
+ *
+ * Revision 1.78 2006/12/26 17:19:20 fabiankeil
+ * Bringing back the "useless" localtime() call
+ * I removed in revision 1.67. On some platforms
+ * it's necessary to prevent time zone offsets.
+ *
+ * Revision 1.77 2006/12/07 18:44:26 fabiankeil
+ * Rebuild request URL in get_destination_from_headers()
+ * to make sure redirect{pcrs command} works as expected
+ * for intercepted requests.
+ *
+ * Revision 1.76 2006/12/06 19:52:25 fabiankeil
+ * Added get_destination_from_headers().
+ *
+ * Revision 1.75 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 1.74 2006/10/02 16:59:12 fabiankeil
+ * The special header "X-Filter: No" now disables
+ * header filtering as well.
+ *
+ * Revision 1.73 2006/09/23 13:26:38 roro
+ * Replace TABs by spaces in source code.
+ *
+ * Revision 1.72 2006/09/23 12:37:21 fabiankeil
+ * Don't print a log message every time filter_headers is
+ * entered or left. It only creates noise without any real
+ * information.
+ *
+ * Revision 1.71 2006/09/21 19:55:17 fabiankeil
+ * Fix +hide-if-modified-since{-n}.
+ *
+ * Revision 1.70 2006/09/08 12:06:34 fabiankeil
+ * Have hide-if-modified-since interpret the random
+ * range value as minutes instead of hours. Allows
+ * more fine-grained configuration.
+ *
+ * Revision 1.69 2006/09/06 16:25:51 fabiankeil
+ * Always have parse_header_time return a pointer
+ * that actual makes sense, even though we currently
+ * only need it to detect problems.
+ *
+ * Revision 1.68 2006/09/06 10:43:32 fabiankeil
+ * Added config option enable-remote-http-toggle
+ * to specify if Privoxy should recognize special
+ * headers (currently only X-Filter) to change its
+ * behaviour. Disabled by default.
+ *
+ * Revision 1.67 2006/09/04 11:01:26 fabiankeil
+ * After filtering de-chunked instances, remove
+ * "Transfer-Encoding" header entirely instead of changing
+ * it to "Transfer-Encoding: identity", which is invalid.
+ * Thanks Michael Shields <shields@msrl.com>. Fixes PR 1318658.
+ *
+ * Don't use localtime in parse_header_time. An empty time struct
+ * is good enough, it gets overwritten by strptime anyway.
+ *
+ * Revision 1.66 2006/09/03 19:38:28 fabiankeil
+ * Use gmtime_r if available, fallback to gmtime with mutex
+ * protection for MacOSX and use vanilla gmtime for the rest.
+ *
+ * Revision 1.65 2006/08/22 10:55:56 fabiankeil
+ * Changed client_referrer to use the right type (size_t) for
+ * hostlenght and to shorten the temporary referrer string with
+ * '\0' instead of adding a useless line break.
+ *
+ * Revision 1.64 2006/08/17 17:15:10 fabiankeil
+ * - Back to timegm() using GnuPG's replacement if necessary.
+ * Using mktime() and localtime() could add a on hour offset if
+ * the randomize factor was big enough to lead to a summer/wintertime
+ * switch.
+ *
+ * - Removed now-useless Privoxy 3.0.3 compatibility glue.
+ *
+ * - Moved randomization code into pick_from_range().
+ *
+ * - Changed parse_header_time definition.
+ * time_t isn't guaranteed to be signed and
+ * if it isn't, -1 isn't available as error code.
+ * Changed some variable types in client_if_modified_since()
+ * because of the same reason.
+ *
+ * Revision 1.63 2006/08/14 13:18:08 david__schmidt
+ * OS/2 compilation compatibility fixups
+ *
+ * Revision 1.62 2006/08/14 08:58:42 fabiankeil
+ * Changed include from strptime.c to strptime.h
+ *
+ * Revision 1.61 2006/08/14 08:25:19 fabiankeil
+ * Split filter-headers{} into filter-client-headers{}
+ * and filter-server-headers{}.
+ * Added parse_header_time() to share some code.
+ * Replaced timegm() with mktime().
+ *
+ * Revision 1.60 2006/08/12 03:54:37 david__schmidt
+ * Windows service integration
+ *
+ * Revision 1.59 2006/08/03 02:46:41 david__schmidt
+ * Incorporate Fabian Keil's patch work:\rhttp://www.fabiankeil.de/sourcecode/privoxy/
+ *
+ * Revision 1.58 2006/07/18 14:48:47 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 1.56.2.10 2006/01/21 16:16:08 david__schmidt
+ * Thanks to Edward Carrel for his patch to modernize OSX's\rpthreads support. See bug #1409623.
+ *
+ * Revision 1.56.2.9 2004/10/03 12:53:45 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 1.56.2.8 2003/07/11 13:21:25 oes
+ * Excluded text/plain objects from filtering. This fixes a
+ * couple of client-crashing, download corruption and
+ * Privoxy performance issues, whose root cause lies in
+ * web servers labelling content of unknown type as text/plain.
+ *
+ * Revision 1.56.2.7 2003/05/06 12:07:26 oes
+ * Fixed bug #729900: Suspicious HOST: headers are now killed and regenerated if necessary
+ *
+ * Revision 1.56.2.6 2003/04/14 21:28:30 oes
+ * Completing the previous change
+ *
+ * Revision 1.56.2.5 2003/04/14 12:08:16 oes
+ * Added temporary workaround for bug in PHP < 4.2.3
+ *
+ * Revision 1.56.2.4 2003/03/07 03:41:05 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 1.56.2.3 2002/11/10 04:20:02 hal9
+ * Fix typo: supressed -> suppressed
+ *
+ * Revision 1.56.2.2 2002/09/25 14:59:53 oes
+ * Improved cookie logging
+ *
+ * Revision 1.56.2.1 2002/09/25 14:52:45 oes
+ * Added basic support for OPTIONS and TRACE HTTP methods:
+ * - New parser function client_max_forwards which decrements
+ * the Max-Forwards HTTP header field of OPTIONS and TRACE
+ * requests by one before forwarding
+ * - New parser function client_host which extracts the host
+ * and port information from the HTTP header field if the
+ * request URI was not absolute
+ * - Don't crumble and re-add the Host: header, but only generate
+ * and append if missing
+ *
+ * Revision 1.56 2002/05/12 15:34:22 jongfoster
+ * Fixing typo in a comment
+ *
+ * Revision 1.55 2002/05/08 16:01:07 oes
+ * Optimized add_to_iob:
+ * - Use realloc instead of malloc(), memcpy(), free()
+ * - Expand to powers of two if possible, to get
+ * O(log n) reallocs instead of O(n).
+ * - Moved check for buffer limit here from chat
+ * - Report failure via returncode
+ *
+ * Revision 1.54 2002/04/02 15:03:16 oes
+ * Tiny code cosmetics
+ *
+ * Revision 1.53 2002/03/26 22:29:55 swa
+ * we have a new homepage!
+ *
+ * Revision 1.52 2002/03/24 13:25:43 swa
+ * name change related issues
+ *
+ * Revision 1.51 2002/03/13 00:27:05 jongfoster
+ * Killing warnings
+ *
+ * Revision 1.50 2002/03/12 01:45:35 oes
+ * More verbose logging
+ *