-const char parsers_rcs[] = "$Id: parsers.c,v 1.79 2006/12/29 18:04:40 fabiankeil Exp $";
+const char parsers_rcs[] = "$Id: parsers.c,v 1.183 2009/06/17 18:23:06 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/parsers.c,v $
* `client_uagent', `client_x_forwarded',
* `client_x_forwarded_adder', `client_xtra_adder',
* `content_type', `crumble', `destroy_list', `enlist',
- * `flush_socket', ``get_header', `sed', `filter_server_header'
- * `filter_client_header', `filter_header', `crunch_server_header',
+ * `flush_socket', ``get_header', `sed', `filter_header'
* `server_content_encoding', `server_content_disposition',
* `server_last_modified', `client_accept_language',
* `crunch_client_header', `client_if_modified_since',
* `client_if_none_match', `get_destination_from_headers',
- * `parse_header_time' and `server_set_cookie'.
+ * `parse_header_time', `decompress_iob' and `server_set_cookie'.
*
- * Copyright : Written by and Copyright (C) 2001-2006 the SourceForge
+ * Copyright : Written by and Copyright (C) 2001-2009 the
* 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: parsers.c,v $
- * 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
- *
- * Revision 1.49 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 1.48 2002/03/07 03:46:53 oes
- * Fixed compiler warnings etc
- *
- * Revision 1.47 2002/02/20 23:15:13 jongfoster
- * Parsing functions now handle out-of-memory gracefully by returning
- * an error code.
- *
- * Revision 1.46 2002/01/17 21:03:47 jongfoster
- * Moving all our URL and URL pattern parsing code to urlmatch.c.
- *
- * Revision 1.45 2002/01/09 14:33:03 oes
- * Added support for localtime_r.
- *
- * Revision 1.44 2001/12/14 01:22:54 steudten
- * Remove 'user:pass@' from 'proto://user:pass@host' for the
- * new added header 'Host: ..'. (See Req ID 491818)
- *
- * Revision 1.43 2001/11/23 00:26:38 jongfoster
- * Fixing two really stupid errors in my previous commit
- *
- * Revision 1.42 2001/11/22 21:59:30 jongfoster
- * Adding code to handle +no-cookies-keep
- *
- * Revision 1.41 2001/11/05 23:43:05 steudten
- * Add time+date to log files.
- *
- * Revision 1.40 2001/10/26 20:13:09 jongfoster
- * ctype.h is needed in Windows, too.
- *
- * Revision 1.39 2001/10/26 17:40:04 oes
- * Introduced get_header_value()
- * Removed http->user_agent, csp->referrer and csp->accept_types
- * Removed client_accept()
- *
- * Revision 1.38 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 1.37 2001/10/23 21:36:02 jongfoster
- * Documenting sed()'s error behaviou (doc change only)
- *
- * Revision 1.36 2001/10/13 12:51:51 joergs
- * Removed client_host, (was only required for the old 2.0.2-11 http://noijb.
- * force-load), instead crumble Host: and add it (again) in client_host_adder
- * (in case we get a HTTP/1.0 request without Host: header and forward it to
- * a HTTP/1.1 server/proxy).
- *
- * Revision 1.35 2001/10/09 22:39:21 jongfoster
- * assert.h is also required under Win32, so moving out of #ifndef _WIN32
- * block.
- *
- * Revision 1.34 2001/10/07 18:50:55 oes
- * Added server_content_encoding, renamed server_transfer_encoding
- *
- * Revision 1.33 2001/10/07 18:04:49 oes
- * Changed server_http11 to server_http and its pattern to "HTTP".
- * Additional functionality: it now saves the HTTP status into
- * csp->http->status and sets CT_TABOO for Status 206 (partial range)
- *
- * Revision 1.32 2001/10/07 15:43:28 oes
- * Removed FEATURE_DENY_GZIP and replaced it with client_accept_encoding,
- * client_te and client_accept_encoding_adder, triggered by the new
- * +no-compression action. For HTTP/1.1 the Accept-Encoding header is
- * changed to allow only identity and chunked, and the TE header is
- * crunched. For HTTP/1.0, Accept-Encoding is crunched.
- *
- * parse_http_request no longer does anything than parsing. The rewriting
- * of http->cmd and version mangling are gone. It now also recognizes
- * the put and delete methods and saves the url in http->url. Removed
- * unused variable.
- *
- * renamed content_type and content_length to have the server_ prefix
- *
- * server_content_type now only works if csp->content_type != CT_TABOO
- *
- * added server_transfer_encoding, which
- * - Sets CT_TABOO to prohibit filtering if encoding compresses
- * - Raises the CSP_FLAG_CHUNKED flag if Encoding is "chunked"
- * - Change from "chunked" to "identity" if body was chunked
- * but has been de-chunked for filtering.
- *
- * added server_content_md5 which crunches any Content-MD5 headers
- * if the body was modified.
- *
- * made server_http11 conditional on +downgrade action
- *
- * Replaced 6 boolean members of csp with one bitmap (csp->flags)
- *
- * Revision 1.31 2001/10/05 14:25:02 oes
- * Crumble Keep-Alive from Server
- *
- * Revision 1.30 2001/09/29 12:56:03 joergs
- * IJB now changes HTTP/1.1 to HTTP/1.0 in requests and answers.
- *
- * Revision 1.29 2001/09/24 21:09:24 jongfoster
- * Fixing 2 memory leaks that Guy spotted, where the paramater to
- * enlist() was not being free()d.
- *
- * Revision 1.28 2001/09/22 16:32:28 jongfoster
- * Removing unused #includes.
- *
- * Revision 1.27 2001/09/20 15:45:25 steudten
- *
- * add casting from size_t to int for printf()
- * remove local variable shadow s2
- *
- * Revision 1.26 2001/09/16 17:05:14 jongfoster
- * Removing unused #include showarg.h
- *
- * Revision 1.25 2001/09/16 13:21:27 jongfoster
- * Changes to use new list functions.
- *
- * Revision 1.24 2001/09/13 23:05:50 jongfoster
- * Changing the string paramater to the header parsers a "const".
- *
- * Revision 1.23 2001/09/12 18:08:19 steudten
- *
- * In parse_http_request() header rewriting miss the host value, so
- * from http://www.mydomain.com the result was just " / " not
- * http://www.mydomain.com/ in case we forward.
- *
- * Revision 1.22 2001/09/10 10:58:53 oes
- * Silenced compiler warnings
- *
- * Revision 1.21 2001/07/31 14:46:00 oes
- * - Persistant connections now suppressed
- * - sed() no longer appends empty header to csp->headers
- *
- * Revision 1.20 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 1.19 2001/07/25 17:21:54 oes
- * client_uagent now saves copy of User-Agent: header value
- *
- * Revision 1.18 2001/07/13 14:02:46 oes
- * - Included fix to repair broken HTTP requests that
- * don't contain a path, not even '/'.
- * - Removed all #ifdef PCRS
- * - content_type now always inspected and classified as
- * text, gif or other.
- * - formatting / comments
- *
- * Revision 1.17 2001/06/29 21:45:41 oes
- * Indentation, CRLF->LF, Tab-> Space
- *
- * Revision 1.16 2001/06/29 13:32:42 oes
- * - Fixed a comment
- * - Adapted free_http_request
- * - Removed logentry from cancelled commit
- *
- * Revision 1.15 2001/06/03 19:12:38 oes
- * deleted const struct interceptors
- *
- * Revision 1.14 2001/06/01 18:49:17 jongfoster
- * Replaced "list_share" with "list" - the tiny memory gain was not
- * worth the extra complexity.
- *
- * Revision 1.13 2001/05/31 21:30:33 jongfoster
- * Removed list code - it's now in list.[ch]
- * Renamed "permission" to "action", and changed many features
- * to use the actions file rather than the global config.
- *
- * Revision 1.12 2001/05/31 17:33:13 oes
- *
- * CRLF -> LF
- *
- * Revision 1.11 2001/05/29 20:11:19 joergs
- * '/ * inside comment' warning removed.
- *
- * Revision 1.10 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 1.9 2001/05/28 17:26:33 jongfoster
- * Fixing segfault if last header was crunched.
- * Fixing Windows build (snprintf() is _snprintf() under Win32, but we
- * can use the cross-platform sprintf() instead.)
- *
- * Revision 1.8 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 1.7 2001/05/27 13:19:06 oes
- * Patched Joergs solution for the content-length in.
- *
- * Revision 1.6 2001/05/26 13:39:32 jongfoster
- * Only crunches Content-Length header if applying RE filtering.
- * Without this fix, Microsoft Windows Update wouldn't work.
- *
- * Revision 1.5 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 1.4 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 1.3 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 23:02:36 oes
- * - Made referrer option accept 'L' as a substitute for '§'
- *
- * Revision 1.1.1.1 2001/05/15 13:59:01 oes
- * Initial import of version 2.9.3 source tree
- *
- *
*********************************************************************/
-\f
+
#include "config.h"
#include <ctype.h>
#include <assert.h>
#include <string.h>
+
+#ifdef __GLIBC__
+/*
+ * Convince GNU's libc to provide a strptime prototype.
+ */
+#define __USE_XOPEN
+#endif /*__GLIBC__ */
#include <time.h>
+#ifdef FEATURE_ZLIB
+#include <zlib.h>
+
+#define GZIP_IDENTIFIER_1 0x1f
+#define GZIP_IDENTIFIER_2 0x8b
+
+#define GZIP_FLAG_CHECKSUM 0x02
+#define GZIP_FLAG_EXTRA_FIELDS 0x04
+#define GZIP_FLAG_FILE_NAME 0x08
+#define GZIP_FLAG_COMMENT 0x10
+#define GZIP_FLAG_RESERVED_BITS 0xe0
+#endif
+
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif
#endif /* def FEATURE_PTHREAD */
#include "list.h"
#include "parsers.h"
-#include "encode.h"
#include "ssplit.h"
#include "errlog.h"
#include "jbsockets.h"
#include "miscutil.h"
#include "list.h"
+#include "actions.h"
+#include "filters.h"
#ifndef HAVE_STRPTIME
#include "strptime.h"
/* Fix a problem with Solaris. There should be no effect on other
* platforms.
- * Solaris's isspace() is a macro which uses it's argument directly
+ * Solaris's isspace() is a macro which uses its argument directly
* as an array index. Therefore we need to make sure that high-bit
* characters generate +ve values, and ideally we also want to make
* the argument match the declared parameter type of "int".
#define ijb_isupper(__X) isupper((int)(unsigned char)(__X))
#define ijb_tolower(__X) tolower((int)(unsigned char)(__X))
+static char *get_header_line(struct iob *iob);
+static jb_err scan_headers(struct client_state *csp);
+static jb_err header_tagger(struct client_state *csp, char *header);
+static jb_err parse_header_time(const char *header_time, time_t *result);
+
+static jb_err crumble (struct client_state *csp, char **header);
+static jb_err filter_header (struct client_state *csp, char **header);
+static jb_err client_connection (struct client_state *csp, char **header);
+static jb_err client_referrer (struct client_state *csp, char **header);
+static jb_err client_uagent (struct client_state *csp, char **header);
+static jb_err client_ua (struct client_state *csp, char **header);
+static jb_err client_from (struct client_state *csp, char **header);
+static jb_err client_send_cookie (struct client_state *csp, char **header);
+static jb_err client_x_forwarded (struct client_state *csp, char **header);
+static jb_err client_accept_encoding (struct client_state *csp, char **header);
+static jb_err client_te (struct client_state *csp, char **header);
+static jb_err client_max_forwards (struct client_state *csp, char **header);
+static jb_err client_host (struct client_state *csp, char **header);
+static jb_err client_if_modified_since (struct client_state *csp, char **header);
+static jb_err client_accept_language (struct client_state *csp, char **header);
+static jb_err client_if_none_match (struct client_state *csp, char **header);
+static jb_err crunch_client_header (struct client_state *csp, char **header);
+static jb_err client_x_filter (struct client_state *csp, char **header);
+static jb_err client_range (struct client_state *csp, char **header);
+static jb_err server_set_cookie (struct client_state *csp, char **header);
+static jb_err server_connection (struct client_state *csp, char **header);
+static jb_err server_content_type (struct client_state *csp, char **header);
+static jb_err server_adjust_content_length(struct client_state *csp, char **header);
+static jb_err server_content_md5 (struct client_state *csp, char **header);
+static jb_err server_content_encoding (struct client_state *csp, char **header);
+static jb_err server_transfer_coding (struct client_state *csp, char **header);
+static jb_err server_http (struct client_state *csp, char **header);
+static jb_err crunch_server_header (struct client_state *csp, char **header);
+static jb_err server_last_modified (struct client_state *csp, char **header);
+static jb_err server_content_disposition(struct client_state *csp, char **header);
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+static jb_err server_save_content_length(struct client_state *csp, char **header);
+static jb_err server_keep_alive(struct client_state *csp, char **header);
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+static jb_err client_host_adder (struct client_state *csp);
+static jb_err client_xtra_adder (struct client_state *csp);
+static jb_err client_x_forwarded_for_adder(struct client_state *csp);
+static jb_err client_connection_header_adder(struct client_state *csp);
+static jb_err server_connection_adder(struct client_state *csp);
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+static jb_err server_proxy_connection_adder(struct client_state *csp);
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+static jb_err create_forged_referrer(char **header, const char *hostport);
+static jb_err create_fake_referrer(char **header, const char *fake_referrer);
+static jb_err handle_conditional_hide_referrer_parameter(char **header,
+ const char *host, const int parameter_conditional_block);
+static const char *get_appropiate_connection_header(const struct client_state *csp);
+static void create_content_length_header(unsigned long long content_length,
+ char *header, size_t buffer_length);
+
+/*
+ * List of functions to run on a list of headers.
+ */
+struct parsers
+{
+ /** The header prefix to match */
+ const char *str;
+
+ /** The length of the prefix to match */
+ const size_t len;
+
+ /** The function to apply to this line */
+ const parser_func_ptr parser;
+};
-const struct parsers client_patterns[] = {
+static const struct parsers client_patterns[] = {
{ "referer:", 8, client_referrer },
{ "user-agent:", 11, client_uagent },
{ "ua-", 3, client_ua },
{ "TE:", 3, client_te },
{ "Host:", 5, client_host },
{ "if-modified-since:", 18, client_if_modified_since },
+#ifndef FEATURE_CONNECTION_KEEP_ALIVE
{ "Keep-Alive:", 11, crumble },
- { "connection:", 11, crumble },
+#endif
+ { "connection:", 11, client_connection },
{ "proxy-connection:", 17, crumble },
{ "max-forwards:", 13, client_max_forwards },
{ "Accept-Language:", 16, client_accept_language },
{ "if-none-match:", 14, client_if_none_match },
+ { "Range:", 6, client_range },
+ { "Request-Range:", 14, client_range },
+ { "If-Range:", 9, client_range },
{ "X-Filter:", 9, client_x_filter },
{ "*", 0, crunch_client_header },
- { "*", 0, filter_client_header },
+ { "*", 0, filter_header },
{ NULL, 0, NULL }
};
-const struct parsers server_patterns[] = {
- { "HTTP", 4, server_http },
+static const struct parsers server_patterns[] = {
+ { "HTTP/", 5, server_http },
{ "set-cookie:", 11, server_set_cookie },
- { "connection:", 11, crumble },
+ { "connection:", 11, server_connection },
{ "Content-Type:", 13, server_content_type },
- { "Content-Length:", 15, server_content_length },
{ "Content-MD5:", 12, server_content_md5 },
{ "Content-Encoding:", 17, server_content_encoding },
- { "Transfer-Encoding:", 18, server_transfer_coding },
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ { "Content-Length:", 15, server_save_content_length },
+ { "Keep-Alive:", 11, server_keep_alive },
+#else
{ "Keep-Alive:", 11, crumble },
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+ { "Transfer-Encoding:", 18, server_transfer_coding },
{ "content-disposition:", 20, server_content_disposition },
{ "Last-Modified:", 14, server_last_modified },
{ "*", 0, crunch_server_header },
- { "*", 0, filter_server_header },
- { NULL, 0, NULL }
+ { "*", 0, filter_header },
+ { NULL, 0, NULL }
};
-const struct parsers server_patterns_light[] = {
- { "Content-Length:", 15, server_content_length },
- { "Transfer-Encoding:", 18, server_transfer_coding },
- { NULL, 0, NULL }
-};
-
-const add_header_func_ptr add_client_headers[] = {
+static const add_header_func_ptr add_client_headers[] = {
client_host_adder,
- client_cookie_adder,
- client_x_forwarded_adder,
+ client_x_forwarded_for_adder,
client_xtra_adder,
/* Temporarily disabled: client_accept_encoding_adder, */
- connection_close_adder,
+ client_connection_header_adder,
NULL
};
-
-const add_header_func_ptr add_server_headers[] = {
- connection_close_adder,
+static const add_header_func_ptr add_server_headers[] = {
+ server_connection_adder,
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ server_proxy_connection_adder,
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
NULL
};
*
* Parameters :
* 1 : fd = file descriptor of the socket to read
- * 2 : csp = Current client state (buffers, headers, etc...)
+ * 2 : iob = The I/O buffer to flush, usually csp->iob.
*
* Returns : On success, the number of bytes written are returned (zero
* indicates nothing was written). On error, -1 is returned,
* file, the results are not portable.
*
*********************************************************************/
-int flush_socket(jb_socket fd, struct client_state *csp)
+long flush_socket(jb_socket fd, struct iob *iob)
{
- struct iob *iob = csp->iob;
- int len = iob->eod - iob->cur;
+ long len = iob->eod - iob->cur;
if (len <= 0)
{
* or buffer limit reached.
*
*********************************************************************/
-jb_err add_to_iob(struct client_state *csp, char *buf, int n)
+jb_err add_to_iob(struct client_state *csp, char *buf, long n)
{
struct iob *iob = csp->iob;
size_t used, offset, need, want;
*/
if (need > csp->config->buffer_limit)
{
- log_error(LOG_LEVEL_ERROR, "Buffer limit reached while extending the buffer (iob)");
+ log_error(LOG_LEVEL_INFO,
+ "Buffer limit reached while extending the buffer (iob). Needed: %d. Limit: %d",
+ need, csp->config->buffer_limit);
return JB_ERR_MEMORY;
}
}
+#ifdef FEATURE_ZLIB
/*********************************************************************
*
- * Function : get_header
+ * Function : decompress_iob
*
- * Description : This (odd) routine will parse the csp->iob
+ * Description : Decompress buffered page, expanding the
+ * buffer as necessary. csp->iob->cur
+ * should point to the the beginning of the
+ * compressed data block.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : Any one of the following:
- *
- * 1) a pointer to a dynamically allocated string that contains a header line
- * 2) NULL indicating that the end of the header was reached
- * 3) "" indicating that the end of the iob was reached before finding
- * a complete header line.
+ * Returns : JB_ERR_OK on success,
+ * JB_ERR_MEMORY if out-of-memory limit reached, and
+ * JB_ERR_COMPRESS if error decompressing buffer.
*
*********************************************************************/
-char *get_header(struct client_state *csp)
+jb_err decompress_iob(struct client_state *csp)
{
- struct iob *iob;
- char *p, *q, *ret;
- iob = csp->iob;
+ char *buf; /* new, uncompressed buffer */
+ char *cur; /* Current iob position (to keep the original
+ * iob->cur unmodified if we return early) */
+ size_t bufsize; /* allocated size of the new buffer */
+ size_t old_size; /* Content size before decompression */
+ size_t skip_size; /* Number of bytes at the beginning of the iob
+ that we should NOT decompress. */
+ int status; /* return status of the inflate() call */
+ z_stream zstr; /* used by calls to zlib */
- if ((iob->cur == NULL)
- || ((p = strchr(iob->cur, '\n')) == NULL))
- {
- return(""); /* couldn't find a complete header */
- }
+ assert(csp->iob->cur - csp->iob->buf > 0);
+ assert(csp->iob->eod - csp->iob->cur > 0);
- *p = '\0';
+ bufsize = csp->iob->size;
+ skip_size = (size_t)(csp->iob->cur - csp->iob->buf);
+ old_size = (size_t)(csp->iob->eod - csp->iob->cur);
- ret = strdup(iob->cur);
- if (ret == NULL)
+ cur = csp->iob->cur;
+
+ if (bufsize < (size_t)10)
{
- /* FIXME No way to handle error properly */
- log_error(LOG_LEVEL_FATAL, "Out of memory in get_header()");
+ /*
+ * This is to protect the parsing of gzipped data,
+ * but it should(?) be valid for deflated data also.
+ */
+ log_error(LOG_LEVEL_ERROR, "Buffer too small decompressing iob");
+ return JB_ERR_COMPRESS;
}
- iob->cur = p+1;
+ if (csp->content_type & CT_GZIP)
+ {
+ /*
+ * Our task is slightly complicated by the facts that data
+ * compressed by gzip does not include a zlib header, and
+ * that there is no easily accessible interface in zlib to
+ * handle a gzip header. We strip off the gzip header by
+ * hand, and later inform zlib not to expect a header.
+ */
- if ((q = strchr(ret, '\r')) != NULL) *q = '\0';
+ /*
+ * Strip off the gzip header. Please see RFC 1952 for more
+ * explanation of the appropriate fields.
+ */
+ if (((*cur++ & 0xff) != GZIP_IDENTIFIER_1)
+ || ((*cur++ & 0xff) != GZIP_IDENTIFIER_2)
+ || (*cur++ != Z_DEFLATED))
+ {
+ log_error(LOG_LEVEL_ERROR, "Invalid gzip header when decompressing");
+ return JB_ERR_COMPRESS;
+ }
+ else
+ {
+ int flags = *cur++;
+ if (flags & GZIP_FLAG_RESERVED_BITS)
+ {
+ /* The gzip header has reserved bits set; bail out. */
+ log_error(LOG_LEVEL_ERROR, "Invalid gzip header flags when decompressing");
+ return JB_ERR_COMPRESS;
+ }
- /* is this a blank line (i.e. the end of the header) ? */
- if (*ret == '\0')
- {
- freez(ret);
- return(NULL);
- }
+ /*
+ * Skip mtime (4 bytes), extra flags (1 byte)
+ * and OS type (1 byte).
+ */
+ cur += 6;
- return(ret);
+ /* Skip extra fields if necessary. */
+ if (flags & GZIP_FLAG_EXTRA_FIELDS)
+ {
+ /*
+ * Skip a given number of bytes, specified
+ * as a 16-bit little-endian value.
+ *
+ * XXX: this code is untested and should probably be removed.
+ */
+ int skip_bytes;
+ skip_bytes = *cur++;
+ skip_bytes += *cur++ << 8;
-}
+ /*
+ * The number of bytes to skip should be positive
+ * and we'd like to stay in the buffer.
+ */
+ if ((skip_bytes < 0) || (skip_bytes >= (csp->iob->eod - cur)))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Unreasonable amount of bytes to skip (%d). Stopping decompression",
+ skip_bytes);
+ return JB_ERR_COMPRESS;
+ }
+ log_error(LOG_LEVEL_INFO,
+ "Skipping %d bytes for gzip compression. Does this sound right?",
+ skip_bytes);
+ cur += skip_bytes;
+ }
+ /* Skip the filename if necessary. */
+ if (flags & GZIP_FLAG_FILE_NAME)
+ {
+ /* A null-terminated string is supposed to follow. */
+ while (*cur++ && (cur < csp->iob->eod));
+ }
-/*********************************************************************
- *
- * Function : get_header_value
- *
- * Description : Get the value of a given header from a chained list
- * of header lines or return NULL if no such header is
- * present in the list.
- *
- * Parameters :
- * 1 : header_list = pointer to list
- * 2 : header_name = string with name of header to look for.
- * Trailing colon required, capitalization
- * doesn't matter.
- *
- * Returns : NULL if not found, else value of header
- *
- *********************************************************************/
-char *get_header_value(const struct list *header_list, const char *header_name)
-{
- struct list_entry *cur_entry;
- char *ret = NULL;
- size_t length = 0;
+ /* Skip the comment if necessary. */
+ if (flags & GZIP_FLAG_COMMENT)
+ {
+ /* A null-terminated string is supposed to follow. */
+ while (*cur++ && (cur < csp->iob->eod));
+ }
- assert(header_list);
- assert(header_name);
- length = strlen(header_name);
+ /* Skip the CRC if necessary. */
+ if (flags & GZIP_FLAG_CHECKSUM)
+ {
+ cur += 2;
+ }
- for (cur_entry = header_list->first; cur_entry ; cur_entry = cur_entry->next)
- {
- if (cur_entry->str)
- {
- if (!strncmpic(cur_entry->str, header_name, length))
+ if (cur >= csp->iob->eod)
{
/*
- * Found: return pointer to start of value
+ * If the current position pointer reached or passed
+ * the buffer end, we were obviously tricked to skip
+ * too much.
*/
- ret = (char *) (cur_entry->str + length);
- while (*ret && ijb_isspace(*ret)) ret++;
- return(ret);
+ log_error(LOG_LEVEL_ERROR,
+ "Malformed gzip header detected. Aborting decompression.");
+ return JB_ERR_COMPRESS;
}
}
}
+ else if (csp->content_type & CT_DEFLATE)
+ {
+ /*
+ * XXX: The debug level should be lowered
+ * before the next stable release.
+ */
+ log_error(LOG_LEVEL_INFO, "Decompressing deflated iob: %d", *cur);
+ /*
+ * In theory (that is, according to RFC 1950), deflate-compressed
+ * data should begin with a two-byte zlib header and have an
+ * adler32 checksum at the end. It seems that in practice only
+ * the raw compressed data is sent. Note that this means that
+ * we are not RFC 1950-compliant here, but the advantage is that
+ * this actually works. :)
+ *
+ * We add a dummy null byte to tell zlib where the data ends,
+ * and later inform it not to expect a header.
+ *
+ * Fortunately, add_to_iob() has thoughtfully null-terminated
+ * the buffer; we can just increment the end pointer to include
+ * the dummy byte.
+ */
+ csp->iob->eod++;
+ }
+ else
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Unable to determine compression format for decompression");
+ return JB_ERR_COMPRESS;
+ }
- /*
- * Not found
- */
- return NULL;
-
-}
+ /* Set up the fields required by zlib. */
+ zstr.next_in = (Bytef *)cur;
+ zstr.avail_in = (unsigned int)(csp->iob->eod - cur);
+ zstr.zalloc = Z_NULL;
+ zstr.zfree = Z_NULL;
+ zstr.opaque = Z_NULL;
-/*********************************************************************
- *
- * Function : sed
- *
- * Description : add, delete or modify lines in the HTTP header streams.
- * On entry, it receives a linked list of headers space
- * that was allocated dynamically (both the list nodes
- * and the header contents).
- *
- * As a side effect it frees the space used by the original
- * header lines.
- *
- * Parameters :
- * 1 : pats = list of patterns to match against headers
- * 2 : more_headers = list of functions to add more
- * headers (client or server)
- * 3 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : Single pointer to a fully formed header, or NULL
- * on out-of-memory error.
- *
- *********************************************************************/
-char *sed(const struct parsers pats[],
- const add_header_func_ptr more_headers[],
- struct client_state *csp)
-{
- struct list_entry *p;
- const struct parsers *v;
- const add_header_func_ptr *f;
- jb_err err = JB_ERR_OK;
- int first_run;
+ /*
+ * Passing -MAX_WBITS to inflateInit2 tells the library
+ * that there is no zlib header.
+ */
+ if (inflateInit2(&zstr, -MAX_WBITS) != Z_OK)
+ {
+ log_error(LOG_LEVEL_ERROR, "Error initializing decompression");
+ return JB_ERR_COMPRESS;
+ }
/*
- * If filtering is enabled, sed is run twice,
- * but most of the work needs to be done only once.
+ * Next, we allocate new storage for the inflated data.
+ * We don't modify the existing iob yet, so in case there
+ * is error in decompression we can recover gracefully.
*/
- first_run = (more_headers != NULL ) ? 1 : 0;
+ buf = zalloc(bufsize);
+ if (NULL == buf)
+ {
+ log_error(LOG_LEVEL_ERROR, "Out of memory decompressing iob");
+ return JB_ERR_MEMORY;
+ }
+
+ assert(bufsize >= skip_size);
+ memcpy(buf, csp->iob->buf, skip_size);
+ zstr.avail_out = bufsize - skip_size;
+ zstr.next_out = (Bytef *)buf + skip_size;
- if (first_run) /* Parse and print */
+ /* Try to decompress the whole stream in one shot. */
+ while (Z_BUF_ERROR == (status = inflate(&zstr, Z_FINISH)))
{
- for (v = pats; (err == JB_ERR_OK) && (v->str != NULL) ; v++)
- {
- for (p = csp->headers->first; (err == JB_ERR_OK) && (p != NULL) ; p = p->next)
- {
- /* Header crunch()ed in previous run? -> ignore */
- if (p->str == NULL) continue;
+ /* We need to allocate more memory for the output buffer. */
- if (v == pats) log_error(LOG_LEVEL_HEADER, "scan: %s", p->str);
+ char *tmpbuf; /* used for realloc'ing the buffer */
+ size_t oldbufsize = bufsize; /* keep track of the old bufsize */
- /* Does the current parser handle this header? */
- if ((strncmpic(p->str, v->str, v->len) == 0) || (v->len == CHECK_EVERY_HEADER_REMAINING))
- {
- err = v->parser(csp, (char **)&(p->str));
- }
- }
- }
- /* place any additional headers on the csp->headers list */
- for (f = more_headers; (err == JB_ERR_OK) && (*f) ; f++)
+ if (0 == zstr.avail_in)
{
- err = (*f)(csp);
+ /*
+ * If zlib wants more data then there's a problem, because
+ * the complete compressed file should have been buffered.
+ */
+ log_error(LOG_LEVEL_ERROR,
+ "Unexpected end of compressed iob. Using what we got so far.");
+ break;
}
- }
- else /* Parse only */
- {
+
/*
- * The second run is only needed if the body was modified
- * and the content-lenght has changed.
+ * If we tried the limit and still didn't have enough
+ * memory, just give up.
*/
- if (strncmpic(csp->http->cmd, "HEAD", 4))
+ if (bufsize == csp->config->buffer_limit)
{
- /*XXX: Code duplication*/
- for (v = pats; (err == JB_ERR_OK) && (v->str != NULL) ; v++)
- {
- for (p = csp->headers->first; (err == JB_ERR_OK) && (p != NULL) ; p = p->next)
- {
- /* Header crunch()ed in previous run? -> ignore */
- if (p->str == NULL) continue;
+ log_error(LOG_LEVEL_ERROR, "Buffer limit reached while decompressing iob");
+ return JB_ERR_MEMORY;
+ }
- /* Does the current parser handle this header? */
- if (strncmpic(p->str, v->str, v->len) == 0)
- {
- err = v->parser(csp, (char **)&(p->str));
- }
- }
- }
+ /* Try doubling the buffer size each time. */
+ bufsize *= 2;
+
+ /* Don't exceed the buffer limit. */
+ if (bufsize > csp->config->buffer_limit)
+ {
+ bufsize = csp->config->buffer_limit;
+ }
+
+ /* Try to allocate the new buffer. */
+ tmpbuf = realloc(buf, bufsize);
+ if (NULL == tmpbuf)
+ {
+ log_error(LOG_LEVEL_ERROR, "Out of memory decompressing iob");
+ freez(buf);
+ return JB_ERR_MEMORY;
+ }
+ else
+ {
+ char *oldnext_out = (char *)zstr.next_out;
+
+ /*
+ * Update the fields for inflate() to use the new
+ * buffer, which may be in a location different from
+ * the old one.
+ */
+ zstr.avail_out += bufsize - oldbufsize;
+ zstr.next_out = (Bytef *)tmpbuf + bufsize - zstr.avail_out;
+
+ /*
+ * Compare with an uglier method of calculating these values
+ * that doesn't require the extra oldbufsize variable.
+ */
+ assert(zstr.avail_out == tmpbuf + bufsize - (char *)zstr.next_out);
+ assert((char *)zstr.next_out == tmpbuf + ((char *)oldnext_out - buf));
+ assert(zstr.avail_out > 0U);
+
+ buf = tmpbuf;
}
}
- if (err != JB_ERR_OK)
+ if (Z_STREAM_ERROR == inflateEnd(&zstr))
{
- return NULL;
+ log_error(LOG_LEVEL_ERROR,
+ "Inconsistent stream state after decompression: %s", zstr.msg);
+ /*
+ * XXX: Intentionally no return.
+ *
+ * According to zlib.h, Z_STREAM_ERROR is returned
+ * "if the stream state was inconsistent".
+ *
+ * I assume in this case inflate()'s status
+ * would also be something different than Z_STREAM_END
+ * so this check should be redundant, but lets see.
+ */
}
- return list_to_text(csp->headers);
-}
-
-
-/* here begins the family of parser functions that reformat header lines */
+ if ((status != Z_STREAM_END) && (0 != zstr.avail_in))
+ {
+ /*
+ * We failed to decompress the stream and it's
+ * not simply because of missing data.
+ */
+ log_error(LOG_LEVEL_ERROR,
+ "Unexpected error while decompressing to the buffer (iob): %s",
+ zstr.msg);
+ return JB_ERR_COMPRESS;
+ }
-/*********************************************************************
+ /*
+ * Finally, we can actually update the iob, since the
+ * decompression was successful. First, free the old
+ * buffer.
+ */
+ freez(csp->iob->buf);
+
+ /* Now, update the iob to use the new buffer. */
+ csp->iob->buf = buf;
+ csp->iob->cur = csp->iob->buf + skip_size;
+ csp->iob->eod = (char *)zstr.next_out;
+ csp->iob->size = bufsize;
+
+ /*
+ * Make sure the new uncompressed iob obeys some minimal
+ * consistency conditions.
+ */
+ if ((csp->iob->buf < csp->iob->cur)
+ && (csp->iob->cur <= csp->iob->eod)
+ && (csp->iob->eod <= csp->iob->buf + csp->iob->size))
+ {
+ const size_t new_size = (size_t)(csp->iob->eod - csp->iob->cur);
+ if (new_size > (size_t)0)
+ {
+ log_error(LOG_LEVEL_RE_FILTER,
+ "Decompression successful. Old size: %d, new size: %d.",
+ old_size, new_size);
+ }
+ else
+ {
+ /* zlib thinks this is OK, so lets do the same. */
+ log_error(LOG_LEVEL_INFO, "Decompression didn't result in any content.");
+ }
+ }
+ else
+ {
+ /* It seems that zlib did something weird. */
+ log_error(LOG_LEVEL_ERROR,
+ "Unexpected error decompressing the buffer (iob): %d==%d, %d>%d, %d<%d",
+ csp->iob->cur, csp->iob->buf + skip_size, csp->iob->eod, csp->iob->buf,
+ csp->iob->eod, csp->iob->buf + csp->iob->size);
+ return JB_ERR_COMPRESS;
+ }
+
+ return JB_ERR_OK;
+
+}
+#endif /* defined(FEATURE_ZLIB) */
+
+
+/*********************************************************************
+ *
+ * Function : string_move
+ *
+ * Description : memmove wrapper to move the last part of a string
+ * towards the beginning, overwriting the part in
+ * the middle. strlcpy() can't be used here as the
+ * strings overlap.
+ *
+ * Parameters :
+ * 1 : dst = Destination to overwrite
+ * 2 : src = Source to move.
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void string_move(char *dst, char *src)
+{
+ assert(dst < src);
+
+ /* +1 to copy the terminating nul as well. */
+ memmove(dst, src, strlen(src)+1);
+}
+
+
+/*********************************************************************
+ *
+ * Function : normalize_lws
+ *
+ * Description : Reduces unquoted linear white space in headers
+ * to a single space in accordance with RFC 2616 2.2.
+ * This simplifies parsing and filtering later on.
+ *
+ * XXX: Remove log messages before
+ * the next stable release?
+ *
+ * Parameters :
+ * 1 : header = A header with linear white space to reduce.
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+static void normalize_lws(char *header)
+{
+ char *p = header;
+
+ while (*p != '\0')
+ {
+ if (ijb_isspace(*p) && ijb_isspace(*(p+1)))
+ {
+ char *q = p+1;
+
+ while (ijb_isspace(*q))
+ {
+ q++;
+ }
+ log_error(LOG_LEVEL_HEADER, "Reducing white space in '%s'", header);
+ string_move(p+1, q);
+ }
+
+ if (*p == '\t')
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Converting tab to space in '%s'", header);
+ *p = ' ';
+ }
+ else if (*p == '"')
+ {
+ char *end_of_token = strstr(p+1, "\"");
+
+ if (NULL != end_of_token)
+ {
+ /* Don't mess with quoted text. */
+ p = end_of_token;
+ }
+ else
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Ignoring single quote in '%s'", header);
+ }
+ }
+ p++;
+ }
+
+ p = strchr(header, ':');
+ if ((p != NULL) && (p != header) && ijb_isspace(*(p-1)))
+ {
+ /*
+ * There's still space before the colon.
+ * We don't want it.
+ */
+ string_move(p-1, p);
+ }
+}
+
+
+/*********************************************************************
*
- * Function : filter_server_header
+ * Function : get_header
*
- * Description : Checks if server header filtering is enabled.
- * If it is, filter_header is called to do the work.
+ * Description : This (odd) routine will parse the csp->iob
+ * to get the next complete header.
+ *
+ * Parameters :
+ * 1 : iob = The I/O buffer to parse, usually csp->iob.
+ *
+ * Returns : Any one of the following:
+ *
+ * 1) a pointer to a dynamically allocated string that contains a header line
+ * 2) NULL indicating that the end of the header was reached
+ * 3) "" indicating that the end of the iob was reached before finding
+ * a complete header line.
+ *
+ *********************************************************************/
+char *get_header(struct iob *iob)
+{
+ char *header;
+
+ header = get_header_line(iob);
+
+ if ((header == NULL) || (*header == '\0'))
+ {
+ /*
+ * No complete header read yet, tell the client.
+ */
+ return header;
+ }
+
+ while ((iob->cur[0] == ' ') || (iob->cur[0] == '\t'))
+ {
+ /*
+ * Header spans multiple lines, append the next one.
+ */
+ char *continued_header;
+
+ continued_header = get_header_line(iob);
+ if ((continued_header == NULL) || (*continued_header == '\0'))
+ {
+ /*
+ * No complete header read yet, return what we got.
+ * XXX: Should "unread" header instead.
+ */
+ log_error(LOG_LEVEL_INFO,
+ "Failed to read a multi-line header properly: '%s'",
+ header);
+ break;
+ }
+
+ if (JB_ERR_OK != string_join(&header, continued_header))
+ {
+ log_error(LOG_LEVEL_FATAL,
+ "Out of memory while appending multiple headers.");
+ }
+ else
+ {
+ /* XXX: remove before next stable release. */
+ log_error(LOG_LEVEL_HEADER,
+ "Merged multiple header lines to: '%s'",
+ header);
+ }
+ }
+
+ normalize_lws(header);
+
+ return header;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : get_header_line
+ *
+ * Description : This (odd) routine will parse the csp->iob
+ * to get the next header line.
+ *
+ * Parameters :
+ * 1 : iob = The I/O buffer to parse, usually csp->iob.
+ *
+ * Returns : Any one of the following:
+ *
+ * 1) a pointer to a dynamically allocated string that contains a header line
+ * 2) NULL indicating that the end of the header was reached
+ * 3) "" indicating that the end of the iob was reached before finding
+ * a complete header line.
+ *
+ *********************************************************************/
+static char *get_header_line(struct iob *iob)
+{
+ char *p, *q, *ret;
+
+ if ((iob->cur == NULL)
+ || ((p = strchr(iob->cur, '\n')) == NULL))
+ {
+ return(""); /* couldn't find a complete header */
+ }
+
+ *p = '\0';
+
+ ret = strdup(iob->cur);
+ if (ret == NULL)
+ {
+ /* FIXME No way to handle error properly */
+ log_error(LOG_LEVEL_FATAL, "Out of memory in get_header_line()");
+ }
+ assert(ret != NULL);
+
+ iob->cur = p+1;
+
+ if ((q = strchr(ret, '\r')) != NULL) *q = '\0';
+
+ /* is this a blank line (i.e. the end of the header) ? */
+ if (*ret == '\0')
+ {
+ freez(ret);
+ return NULL;
+ }
+
+ return ret;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : get_header_value
+ *
+ * Description : Get the value of a given header from a chained list
+ * of header lines or return NULL if no such header is
+ * present in the list.
+ *
+ * Parameters :
+ * 1 : header_list = pointer to list
+ * 2 : header_name = string with name of header to look for.
+ * Trailing colon required, capitalization
+ * doesn't matter.
+ *
+ * Returns : NULL if not found, else value of header
+ *
+ *********************************************************************/
+char *get_header_value(const struct list *header_list, const char *header_name)
+{
+ struct list_entry *cur_entry;
+ char *ret = NULL;
+ size_t length = 0;
+
+ assert(header_list);
+ assert(header_name);
+ length = strlen(header_name);
+
+ for (cur_entry = header_list->first; cur_entry ; cur_entry = cur_entry->next)
+ {
+ if (cur_entry->str)
+ {
+ if (!strncmpic(cur_entry->str, header_name, length))
+ {
+ /*
+ * Found: return pointer to start of value
+ */
+ ret = cur_entry->str + length;
+ while (*ret && ijb_isspace(*ret)) ret++;
+ return ret;
+ }
+ }
+ }
+
+ /*
+ * Not found
+ */
+ return NULL;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : scan_headers
+ *
+ * Description : Scans headers, applies tags and updates action bits.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
- * 2 : header = On input, pointer to header to modify.
- * On output, pointer to the modified header, or NULL
- * to remove the header. This function frees the
- * original string if necessary.
*
- * Returns : JB_ERR_OK on success and always succeeds
+ * Returns : JB_ERR_OK
*
*********************************************************************/
-jb_err filter_server_header(struct client_state *csp, char **header)
+static jb_err scan_headers(struct client_state *csp)
{
- if (csp->action->flags & ACTION_FILTER_SERVER_HEADERS)
+ struct list_entry *h; /* Header */
+ jb_err err = JB_ERR_OK;
+
+ for (h = csp->headers->first; (err == JB_ERR_OK) && (h != NULL) ; h = h->next)
{
- filter_header(csp, header);
+ /* Header crunch()ed in previous run? -> ignore */
+ if (h->str == NULL) continue;
+ log_error(LOG_LEVEL_HEADER, "scan: %s", h->str);
+ err = header_tagger(csp, h->str);
}
- return(JB_ERR_OK);
+
+ return err;
}
+
/*********************************************************************
*
- * Function : filter_client_header
+ * Function : sed
+ *
+ * Description : add, delete or modify lines in the HTTP header streams.
+ * On entry, it receives a linked list of headers space
+ * that was allocated dynamically (both the list nodes
+ * and the header contents).
*
- * Description : Checks if client header filtering is enabled.
- * If it is, filter_header is called to do the work.
+ * As a side effect it frees the space used by the original
+ * header lines.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
- * 2 : header = On input, pointer to header to modify.
- * On output, pointer to the modified header, or NULL
- * to remove the header. This function frees the
- * original string if necessary.
+ * 2 : filter_server_headers = Boolean to switch between
+ * server and header filtering.
+ *
+ * Returns : JB_ERR_OK in case off success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+jb_err sed(struct client_state *csp, int filter_server_headers)
+{
+ /* XXX: use more descriptive names. */
+ struct list_entry *p;
+ const struct parsers *v;
+ const add_header_func_ptr *f;
+ jb_err err = JB_ERR_OK;
+
+ if (filter_server_headers)
+ {
+ v = server_patterns;
+ f = add_server_headers;
+ }
+ else
+ {
+ v = client_patterns;
+ f = add_client_headers;
+ }
+
+ scan_headers(csp);
+
+ while ((err == JB_ERR_OK) && (v->str != NULL))
+ {
+ for (p = csp->headers->first; (err == JB_ERR_OK) && (p != NULL); p = p->next)
+ {
+ /* Header crunch()ed in previous run? -> ignore */
+ if (p->str == NULL) continue;
+
+ /* Does the current parser handle this header? */
+ if ((strncmpic(p->str, v->str, v->len) == 0) ||
+ (v->len == CHECK_EVERY_HEADER_REMAINING))
+ {
+ err = v->parser(csp, &(p->str));
+ }
+ }
+ v++;
+ }
+
+ /* place additional headers on the csp->headers list */
+ while ((err == JB_ERR_OK) && (*f))
+ {
+ err = (*f)(csp);
+ f++;
+ }
+
+ return err;
+}
+
+
+/*********************************************************************
+ *
+ * Function : update_server_headers
+ *
+ * Description : Updates server headers after the body has been modified.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : JB_ERR_OK in case off success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+jb_err update_server_headers(struct client_state *csp)
+{
+ jb_err err = JB_ERR_OK;
+
+ static const struct parsers server_patterns_light[] = {
+ { "Content-Length:", 15, server_adjust_content_length },
+ { "Transfer-Encoding:", 18, server_transfer_coding },
+#ifdef FEATURE_ZLIB
+ { "Content-Encoding:", 17, server_content_encoding },
+#endif /* def FEATURE_ZLIB */
+ { NULL, 0, NULL }
+ };
+
+ if (strncmpic(csp->http->cmd, "HEAD", 4))
+ {
+ const struct parsers *v;
+ struct list_entry *p;
+
+ for (v = server_patterns_light; (err == JB_ERR_OK) && (v->str != NULL); v++)
+ {
+ for (p = csp->headers->first; (err == JB_ERR_OK) && (p != NULL); p = p->next)
+ {
+ /* Header crunch()ed in previous run? -> ignore */
+ if (p->str == NULL) continue;
+
+ /* Does the current parser handle this header? */
+ if (strncmpic(p->str, v->str, v->len) == 0)
+ {
+ err = v->parser(csp, (char **)&(p->str));
+ }
+ }
+ }
+ }
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((JB_ERR_OK == err)
+ && (csp->flags & CSP_FLAG_MODIFIED)
+ && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
+ && !(csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET))
+ {
+ char header[50];
+
+ create_content_length_header(csp->content_length, header, sizeof(header));
+ err = enlist(csp->headers, header);
+ if (JB_ERR_OK == err)
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Content modified with no Content-Length header set. "
+ "Created: %s.", header);
+ }
+ }
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ return err;
+}
+
+
+/*********************************************************************
+ *
+ * Function : header_tagger
+ *
+ * Description : Executes all text substitutions from applying
+ * tag actions and saves the result as tag.
+ *
+ * XXX: Shares enough code with filter_header() and
+ * pcrs_filter_response() to warrant some helper functions.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = Header that is used as tagger input
*
* Returns : JB_ERR_OK on success and always succeeds
*
*********************************************************************/
-jb_err filter_client_header(struct client_state *csp, char **header)
+static jb_err header_tagger(struct client_state *csp, char *header)
{
- if (csp->action->flags & ACTION_FILTER_CLIENT_HEADERS)
+ int wanted_filter_type;
+ int multi_action_index;
+ int i;
+ pcrs_job *job;
+
+ struct file_list *fl;
+ struct re_filterfile_spec *b;
+ struct list_entry *tag_name;
+
+ int found_filters = 0;
+ const size_t header_length = strlen(header);
+
+ if (csp->flags & CSP_FLAG_CLIENT_HEADER_PARSING_DONE)
+ {
+ wanted_filter_type = FT_SERVER_HEADER_TAGGER;
+ multi_action_index = ACTION_MULTI_SERVER_HEADER_TAGGER;
+ }
+ else
{
- filter_header(csp, header);
+ wanted_filter_type = FT_CLIENT_HEADER_TAGGER;
+ multi_action_index = ACTION_MULTI_CLIENT_HEADER_TAGGER;
}
- return(JB_ERR_OK);
+
+ /* Check if there are any filters */
+ for (i = 0; i < MAX_AF_FILES; i++)
+ {
+ fl = csp->rlist[i];
+ if (NULL != fl)
+ {
+ if (NULL != fl->f)
+ {
+ found_filters = 1;
+ break;
+ }
+ }
+ }
+
+ if (0 == found_filters)
+ {
+ log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
+ "tagging enabled, but no taggers available.");
+ return JB_ERR_OK;
+ }
+
+ for (i = 0; i < MAX_AF_FILES; i++)
+ {
+ fl = csp->rlist[i];
+ if ((NULL == fl) || (NULL == fl->f))
+ {
+ /*
+ * Either there are no filter files
+ * left, or this filter file just
+ * contains no valid filters.
+ *
+ * Continue to be sure we don't miss
+ * valid filter files that are chained
+ * after empty or invalid ones.
+ */
+ continue;
+ }
+
+ /* For all filters, */
+ for (b = fl->f; b; b = b->next)
+ {
+ if (b->type != wanted_filter_type)
+ {
+ /* skip the ones we don't care about, */
+ continue;
+ }
+ /* leaving only taggers that could apply, of which we use the ones, */
+ for (tag_name = csp->action->multi[multi_action_index]->first;
+ NULL != tag_name; tag_name = tag_name->next)
+ {
+ /* that do apply, and */
+ if (strcmp(b->name, tag_name->str) == 0)
+ {
+ char *modified_tag = NULL;
+ char *tag = header;
+ size_t size = header_length;
+ pcrs_job *joblist = b->joblist;
+
+ if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
+
+ if (NULL == joblist)
+ {
+ log_error(LOG_LEVEL_RE_FILTER,
+ "Tagger %s has empty joblist. Nothing to do.", b->name);
+ continue;
+ }
+
+ /* execute their pcrs_joblist on the header. */
+ for (job = joblist; NULL != job; job = job->next)
+ {
+ const int hits = pcrs_execute(job, tag, size, &modified_tag, &size);
+
+ if (0 < hits)
+ {
+ /* Success, continue with the modified version. */
+ if (tag != header)
+ {
+ freez(tag);
+ }
+ tag = modified_tag;
+ }
+ else
+ {
+ /* Tagger doesn't match */
+ if (0 > hits)
+ {
+ /* Regex failure, log it but continue anyway. */
+ assert(NULL != header);
+ log_error(LOG_LEVEL_ERROR,
+ "Problems with tagger \'%s\' and header \'%s\': %s",
+ b->name, *header, pcrs_strerror(hits));
+ }
+ freez(modified_tag);
+ }
+ }
+
+ if (b->dynamic) pcrs_free_joblist(joblist);
+
+ /* If this tagger matched */
+ if (tag != header)
+ {
+ if (0 == size)
+ {
+ /*
+ * There is to technical limitation which makes
+ * it impossible to use empty tags, but I assume
+ * no one would do it intentionally.
+ */
+ freez(tag);
+ log_error(LOG_LEVEL_INFO,
+ "Tagger \'%s\' created an empty tag. Ignored.",
+ b->name);
+ continue;
+ }
+
+ if (!list_contains_item(csp->tags, tag))
+ {
+ if (JB_ERR_OK != enlist(csp->tags, tag))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Insufficient memory to add tag \'%s\', "
+ "based on tagger \'%s\' and header \'%s\'",
+ tag, b->name, *header);
+ }
+ else
+ {
+ char *action_message;
+ /*
+ * update the action bits right away, to make
+ * tagging based on tags set by earlier taggers
+ * of the same kind possible.
+ */
+ if (update_action_bits_for_tag(csp, tag))
+ {
+ action_message = "Action bits updated accordingly.";
+ }
+ else
+ {
+ action_message = "No action bits update necessary.";
+ }
+
+ log_error(LOG_LEVEL_HEADER,
+ "Tagger \'%s\' added tag \'%s\'. %s",
+ b->name, tag, action_message);
+ }
+ }
+ else
+ {
+ /* XXX: Is this log-worthy? */
+ log_error(LOG_LEVEL_HEADER,
+ "Tagger \'%s\' didn't add tag \'%s\'. "
+ "Tag already present", b->name, tag);
+ }
+ freez(tag);
+ } /* if the tagger matched */
+ } /* if the tagger applies */
+ } /* for every tagger that could apply */
+ } /* for all filters */
+ } /* for all filter files */
+
+ return JB_ERR_OK;
}
+/* here begins the family of parser functions that reformat header lines */
+
/*********************************************************************
*
* Function : filter_header
*
* Description : Executes all text substitutions from all applying
- * +filter actions on the header.
+ * +(server|client)-header-filter actions on the header.
* Most of the code was copied from pcrs_filter_response,
* including the rather short variable names
*
* Returns : JB_ERR_OK on success and always succeeds
*
*********************************************************************/
-jb_err filter_header(struct client_state *csp, char **header)
+static jb_err filter_header(struct client_state *csp, char **header)
{
int hits=0;
int matches;
struct list_entry *filtername;
int i, found_filters = 0;
+ int wanted_filter_type;
+ int multi_action_index;
+
+ if (csp->flags & CSP_FLAG_NO_FILTERING)
+ {
+ return JB_ERR_OK;
+ }
+
+ if (csp->flags & CSP_FLAG_CLIENT_HEADER_PARSING_DONE)
+ {
+ wanted_filter_type = FT_SERVER_HEADER_FILTER;
+ multi_action_index = ACTION_MULTI_SERVER_HEADER_FILTER;
+ }
+ else
+ {
+ wanted_filter_type = FT_CLIENT_HEADER_FILTER;
+ multi_action_index = ACTION_MULTI_CLIENT_HEADER_FILTER;
+ }
/*
* Need to check the set of re_filterfiles...
if (0 == found_filters)
{
- log_error(LOG_LEVEL_ERROR, "Unable to get current state of regexp filtering.");
- return(JB_ERR_OK);
+ log_error(LOG_LEVEL_ERROR, "Inconsistent configuration: "
+ "header filtering enabled, but no matching filters available.");
+ return JB_ERR_OK;
}
for (i = 0; i < MAX_AF_FILES; i++)
{
fl = csp->rlist[i];
if ((NULL == fl) || (NULL == fl->f))
- break;
+ {
+ /*
+ * Either there are no filter files
+ * left, or this filter file just
+ * contains no valid filters.
+ *
+ * Continue to be sure we don't miss
+ * valid filter files that are chained
+ * after empty or invalid ones.
+ */
+ continue;
+ }
/*
* For all applying +filter actions, look if a filter by that
* name exists and if yes, execute its pcrs_joblist on the
*/
for (b = fl->f; b; b = b->next)
{
- for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first;
+ if (b->type != wanted_filter_type)
+ {
+ /* Skip other filter types */
+ continue;
+ }
+
+ for (filtername = csp->action->multi[multi_action_index]->first;
filtername ; filtername = filtername->next)
{
if (strcmp(b->name, filtername->str) == 0)
{
int current_hits = 0;
+ pcrs_job *joblist = b->joblist;
- if ( NULL == b->joblist )
+ if (b->dynamic) joblist = compile_dynamic_pcrs_job_list(csp, b);
+
+ if (NULL == joblist)
{
log_error(LOG_LEVEL_RE_FILTER, "Filter %s has empty joblist. Nothing to do.", b->name);
continue;
}
- log_error(LOG_LEVEL_RE_FILTER, "re_filtering %s (size %d) with filter %s...",
+ log_error(LOG_LEVEL_RE_FILTER, "filtering \'%s\' (size %d) with \'%s\' ...",
*header, size, b->name);
/* Apply all jobs from the joblist */
- for (job = b->joblist; NULL != job; job = job->next)
+ for (job = joblist; NULL != job; job = job->next)
{
matches = pcrs_execute(job, *header, size, &newheader, &size);
if ( 0 < matches )
/* RegEx failure */
log_error(LOG_LEVEL_ERROR, "Filtering \'%s\' with \'%s\' didn't work out: %s",
*header, b->name, pcrs_strerror(matches));
- if( newheader != NULL)
+ if (newheader != NULL)
{
log_error(LOG_LEVEL_ERROR, "Freeing what's left: %s", newheader);
freez(newheader);
}
}
}
- log_error(LOG_LEVEL_RE_FILTER, " ...produced %d hits (new size %d).", current_hits, size);
+
+ if (b->dynamic) pcrs_free_joblist(joblist);
+
+ log_error(LOG_LEVEL_RE_FILTER, "... produced %d hits (new size %d).", current_hits, size);
hits += current_hits;
}
}
}
}
-
- if ( 0 == size )
+
+ /*
+ * Additionally checking for hits is important because if
+ * the continue hack is triggered, server headers can
+ * arrive empty to separate multiple heads from each other.
+ */
+ if ((0 == size) && hits)
+ {
+ log_error(LOG_LEVEL_HEADER, "Removing empty header %s", *header);
+ freez(*header);
+ }
+
+ return JB_ERR_OK;
+}
+
+
+/*********************************************************************
+ *
+ * Function : server_connection
+ *
+ * Description : Makes sure a proper "Connection:" header is
+ * set and signals connection_header_adder to
+ * do nothing.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = On input, pointer to header to modify.
+ * On output, pointer to the modified header, or NULL
+ * to remove the header. This function frees the
+ * original string if necessary.
+ *
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+static jb_err server_connection(struct client_state *csp, char **header)
+{
+ if (!strcmpic(*header, "Connection: keep-alive"))
+ {
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE))
+ {
+ csp->flags |= CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
+ }
+
+ if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Keeping the server header '%s' around.", *header);
+ }
+ else
+#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
+ {
+ char *old_header = *header;
+
+ *header = strdup("Connection: close");
+ if (header == NULL)
+ {
+ return JB_ERR_MEMORY;
+ }
+ log_error(LOG_LEVEL_HEADER, "Replaced: \'%s\' with \'%s\'", old_header, *header);
+ freez(old_header);
+ }
+ }
+
+ /* Signal server_connection_adder() to return early. */
+ csp->flags |= CSP_FLAG_SERVER_CONNECTION_HEADER_SET;
+
+ return JB_ERR_OK;
+}
+
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+/*********************************************************************
+ *
+ * Function : server_keep_alive
+ *
+ * Description : Stores the servers keep alive timeout.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = On input, pointer to header to modify.
+ * On output, pointer to the modified header, or NULL
+ * to remove the header. This function frees the
+ * original string if necessary.
+ *
+ * Returns : JB_ERR_OK.
+ *
+ *********************************************************************/
+static jb_err server_keep_alive(struct client_state *csp, char **header)
+{
+ unsigned int keep_alive_timeout;
+ const char *timeout_position = strstr(*header, "timeout=");
+
+ if ((NULL == timeout_position)
+ || (1 != sscanf(timeout_position, "timeout=%u", &keep_alive_timeout)))
+ {
+ log_error(LOG_LEVEL_ERROR, "Couldn't parse: %s", *header);
+ }
+ else
+ {
+ if (keep_alive_timeout < csp->server_connection.keep_alive_timeout)
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Reducing keep-alive timeout from %u to %u.",
+ csp->server_connection.keep_alive_timeout, keep_alive_timeout);
+ csp->server_connection.keep_alive_timeout = keep_alive_timeout;
+ }
+ else
+ {
+ /* XXX: Is this log worthy? */
+ log_error(LOG_LEVEL_HEADER,
+ "Server keep-alive timeout is %u. Sticking with %u.",
+ keep_alive_timeout, csp->server_connection.keep_alive_timeout);
+ }
+ }
+
+ return JB_ERR_OK;
+}
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+
+
+/*********************************************************************
+ *
+ * Function : client_connection
+ *
+ * Description : Makes sure a proper "Connection:" header is
+ * set and signals connection_header_adder
+ * to do nothing.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = On input, pointer to header to modify.
+ * On output, pointer to the modified header, or NULL
+ * to remove the header. This function frees the
+ * original string if necessary.
+ *
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+static jb_err client_connection(struct client_state *csp, char **header)
+{
+ const char *wanted_header = get_appropiate_connection_header(csp);
+
+ if (strcmpic(*header, wanted_header))
+ {
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if (!(csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING))
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Keeping the client header '%s' around. "
+ "The connection will not be kept alive.",
+ *header);
+ }
+ else
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+ {
+ char *old_header = *header;
+
+ *header = strdup(wanted_header);
+ if (header == NULL)
+ {
+ return JB_ERR_MEMORY;
+ }
+ log_error(LOG_LEVEL_HEADER,
+ "Replaced: \'%s\' with \'%s\'", old_header, *header);
+ freez(old_header);
+ }
+ }
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ else
{
- log_error(LOG_LEVEL_HEADER, "Removing empty header %s", *header);
- freez(*header);
+ log_error(LOG_LEVEL_HEADER,
+ "Keeping the client header '%s' around. "
+ "The server connection will be kept alive if possible.",
+ *header);
+ csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
}
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
+
+ /* Signal client_connection_adder() to return early. */
+ csp->flags |= CSP_FLAG_CLIENT_CONNECTION_HEADER_SET;
- return(JB_ERR_OK);
+ return JB_ERR_OK;
}
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err crumble(struct client_state *csp, char **header)
+static jb_err crumble(struct client_state *csp, char **header)
{
+ (void)csp;
log_error(LOG_LEVEL_HEADER, "crumble crunched: %s!", *header);
freez(*header);
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : crunch_server_header
* Returns : JB_ERR_OK on success and always succeeds
*
*********************************************************************/
-jb_err crunch_server_header(struct client_state *csp, char **header)
+static jb_err crunch_server_header(struct client_state *csp, char **header)
{
const char *crunch_pattern;
- /*Is there a header to crunch*/
+ /* Do we feel like crunching? */
if ((csp->action->flags & ACTION_CRUNCH_SERVER_HEADER))
{
crunch_pattern = csp->action->string[ACTION_STRING_SERVER_HEADER];
- /*Is the current header the lucky one?*/
+ /* Is the current header the lucky one? */
if (strstr(*header, crunch_pattern))
{
log_error(LOG_LEVEL_HEADER, "Crunching server header: %s (contains: %s)", *header, crunch_pattern);
return JB_ERR_OK;
}
+
+
/*********************************************************************
*
* Function : server_content_type
*
* Description : Set the content-type for filterable types (text/.*,
- * javascript and image/gif) unless filtering has been
+ * .*xml.*, javascript and image/gif) unless filtering has been
* forbidden (CT_TABOO) while parsing earlier headers.
* NOTE: Since text/plain is commonly used by web servers
* for files whose correct type is unknown, we don't
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_content_type(struct client_state *csp, char **header)
+static jb_err server_content_type(struct client_state *csp, char **header)
{
- const char *newval;
-
- newval = csp->action->string[ACTION_STRING_CONTENT_TYPE];
-
- if (csp->content_type != CT_TABOO)
- {
- if ((strstr(*header, " text/") && !strstr(*header, "plain"))
- || strstr(*header, "xml")
- || strstr(*header, "application/x-javascript"))
- csp->content_type = CT_TEXT;
- else if (strstr(*header, " image/gif"))
- csp->content_type = CT_GIF;
- else if (strstr(*header, " image/jpeg"))
- csp->content_type = CT_JPEG;
- else
- csp->content_type = 0;
+ /* Remove header if it isn't the first Content-Type header */
+ if ((csp->content_type & CT_DECLARED))
+ {
+ /*
+ * Another, slightly slower, way to see if
+ * we already parsed another Content-Type header.
+ */
+ assert(NULL != get_header_value(csp->headers, "Content-Type:"));
+
+ log_error(LOG_LEVEL_ERROR,
+ "Multiple Content-Type headers. Removing and ignoring: \'%s\'",
+ *header);
+ freez(*header);
+
+ return JB_ERR_OK;
}
+
/*
- * Are we enabling text mode by force?
+ * Signal that the Content-Type has been set.
*/
- if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
+ csp->content_type |= CT_DECLARED;
+
+ if (!(csp->content_type & CT_TABOO))
{
- /*
- * Do we really have to?
- */
- if (csp->content_type == CT_TEXT)
+ /*
+ * XXX: The assumption that text/plain is a sign of
+ * binary data seems to be somewhat unreasonable nowadays
+ * and should be dropped after 3.0.8 is out.
+ */
+ if ((strstr(*header, "text/") && !strstr(*header, "plain"))
+ || strstr(*header, "xml")
+ || strstr(*header, "application/x-javascript"))
{
- log_error(LOG_LEVEL_HEADER, "Text mode is already enabled.");
+ csp->content_type |= CT_TEXT;
}
- else
+ else if (strstr(*header, "image/gif"))
{
- csp->content_type = CT_TEXT;
- log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!");
+ csp->content_type |= CT_GIF;
}
}
+
/*
* Are we messing with the content type?
- */
+ */
if (csp->action->flags & ACTION_CONTENT_TYPE_OVERWRITE)
- {
- /*
- * Make sure the user doesn't accidently
- * change the content type of binary documents.
- */
- if (csp->content_type == CT_TEXT)
- {
- freez(*header);
- *header = strdup("Content-Type: ");
- string_append(header, newval);
-
- if (header == NULL)
- {
- log_error(LOG_LEVEL_HEADER, "Insufficient memory. Conten-Type crunched without replacement!");
- return JB_ERR_MEMORY;
- }
- log_error(LOG_LEVEL_HEADER, "Modified: %s!", *header);
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "%s not replaced. It doesn't look like text. "
- "Enable force-text-mode if you know what you're doing.", *header);
- }
- }
+ {
+ /*
+ * Make sure the user doesn't accidently
+ * change the content type of binary documents.
+ */
+ if ((csp->content_type & CT_TEXT) || (csp->action->flags & ACTION_FORCE_TEXT_MODE))
+ {
+ freez(*header);
+ *header = strdup("Content-Type: ");
+ string_append(header, csp->action->string[ACTION_STRING_CONTENT_TYPE]);
+
+ if (header == NULL)
+ {
+ log_error(LOG_LEVEL_HEADER, "Insufficient memory to replace Content-Type!");
+ return JB_ERR_MEMORY;
+ }
+ log_error(LOG_LEVEL_HEADER, "Modified: %s!", *header);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_HEADER, "%s not replaced. "
+ "It doesn't look like a content type that should be filtered. "
+ "Enable force-text-mode if you know what you're doing.", *header);
+ }
+ }
+
return JB_ERR_OK;
}
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_transfer_coding(struct client_state *csp, char **header)
+static jb_err server_transfer_coding(struct client_state *csp, char **header)
{
/*
* Turn off pcrs and gif filtering if body compressed
*/
if (strstr(*header, "gzip") || strstr(*header, "compress") || strstr(*header, "deflate"))
{
+#ifdef FEATURE_ZLIB
+ /*
+ * XXX: Added to test if we could use CT_GZIP and CT_DEFLATE here.
+ */
+ log_error(LOG_LEVEL_INFO, "Marking content type for %s as CT_TABOO because of %s.",
+ csp->http->cmd, *header);
+#endif /* def FEATURE_ZLIB */
csp->content_type = CT_TABOO;
}
/*
* If the body was modified, it has been de-chunked first
- * and the header must be removed.
+ * and the header must be removed.
+ *
+ * FIXME: If there is more than one transfer encoding,
+ * only the "chunked" part should be removed here.
*/
if (csp->flags & CSP_FLAG_MODIFIED)
{
*
* Function : server_content_encoding
*
- * Description : Prohibit filtering (CT_TABOO) if content encoding compresses
+ * Description : This function is run twice for each request,
+ * unless FEATURE_ZLIB and filtering are disabled.
+ *
+ * The first run is used to check if the content
+ * is compressed, if FEATURE_ZLIB is disabled
+ * filtering is then disabled as well, if FEATURE_ZLIB
+ * is enabled the content is marked for decompression.
+ *
+ * The second run is used to remove the Content-Encoding
+ * header if the decompression was successful.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_content_encoding(struct client_state *csp, char **header)
+static jb_err server_content_encoding(struct client_state *csp, char **header)
{
- /*
- * Turn off pcrs and gif filtering if body compressed
- */
+#ifdef FEATURE_ZLIB
+ if ((csp->flags & CSP_FLAG_MODIFIED)
+ && (csp->content_type & (CT_GZIP | CT_DEFLATE)))
+ {
+ /*
+ * We successfully decompressed the content,
+ * and have to clean the header now, so the
+ * client no longer expects compressed data..
+ *
+ * XXX: There is a difference between cleaning
+ * and removing it completely.
+ */
+ log_error(LOG_LEVEL_HEADER, "Crunching: %s", *header);
+ freez(*header);
+ }
+ else if (strstr(*header, "gzip"))
+ {
+ /* Mark for gzip decompression */
+ csp->content_type |= CT_GZIP;
+ }
+ else if (strstr(*header, "deflate"))
+ {
+ /* Mark for zlib decompression */
+ csp->content_type |= CT_DEFLATE;
+ }
+ else if (strstr(*header, "compress"))
+ {
+ /*
+ * We can't decompress this; therefore we can't filter
+ * it either.
+ */
+ csp->content_type |= CT_TABOO;
+ }
+#else /* !defined(FEATURE_ZLIB) */
if (strstr(*header, "gzip") || strstr(*header, "compress") || strstr(*header, "deflate"))
{
- csp->content_type = CT_TABOO;
+ /*
+ * Body is compressed, turn off pcrs and gif filtering.
+ */
+ csp->content_type |= CT_TABOO;
+
+ /*
+ * Log a warning if the user expects the content to be filtered.
+ */
+ if ((csp->rlist != NULL) &&
+ (!list_is_empty(csp->action->multi[ACTION_MULTI_FILTER])))
+ {
+ log_error(LOG_LEVEL_INFO,
+ "Compressed content detected, content filtering disabled. "
+ "Consider recompiling Privoxy with zlib support or "
+ "enable the prevent-compression action.");
+ }
}
+#endif /* defined(FEATURE_ZLIB) */
return JB_ERR_OK;
/*********************************************************************
*
- * Function : server_content_length
+ * Function : server_adjust_content_length
*
* Description : Adjust Content-Length header if we modified
* the body.
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_content_length(struct client_state *csp, char **header)
+static jb_err server_adjust_content_length(struct client_state *csp, char **header)
{
- if (csp->content_length != 0) /* Content length could have been modified */
+ /* Regenerate header if the content was modified. */
+ if (csp->flags & CSP_FLAG_MODIFIED)
{
- /*
- * XXX: Shouldn't we check if csp->content_length
- * is different than the original value?
- */
+ const size_t header_length = 50;
freez(*header);
- *header = (char *) zalloc(100);
+ *header = malloc(header_length);
if (*header == NULL)
{
return JB_ERR_MEMORY;
}
+ create_content_length_header(csp->content_length, *header, header_length);
+ log_error(LOG_LEVEL_HEADER,
+ "Adjusted Content-Length to %llu", csp->content_length);
+ }
+
+ return JB_ERR_OK;
+}
- sprintf(*header, "Content-Length: %d", (int) csp->content_length);
- log_error(LOG_LEVEL_HEADER, "Adjust Content-Length to %d", (int) csp->content_length);
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+/*********************************************************************
+ *
+ * Function : server_save_content_length
+ *
+ * Description : Save the Content-Length sent by the server.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = On input, pointer to header to modify.
+ * On output, pointer to the modified header, or NULL
+ * to remove the header. This function frees the
+ * original string if necessary.
+ *
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+static jb_err server_save_content_length(struct client_state *csp, char **header)
+{
+ unsigned long long content_length = 0;
+
+ assert(*(*header+14) == ':');
+
+ if (1 != sscanf(*header+14, ": %llu", &content_length))
+ {
+ log_error(LOG_LEVEL_ERROR, "Crunching invalid header: %s", *header);
+ freez(*header);
+ }
+ else
+ {
+ csp->expected_content_length = content_length;
+ csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
+ csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
}
return JB_ERR_OK;
}
+#endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
/*********************************************************************
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_content_md5(struct client_state *csp, char **header)
+static jb_err server_content_md5(struct client_state *csp, char **header)
{
if (csp->flags & CSP_FLAG_MODIFIED)
{
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : server_content_disposition
*
- * Description : If enabled, blocks or modifies the "content-disposition" header.
+ * Description : If enabled, blocks or modifies the "Content-Disposition" header.
* Called from `sed'.
*
* Parameters :
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_content_disposition(struct client_state *csp, char **header)
+static jb_err server_content_disposition(struct client_state *csp, char **header)
{
const char *newval;
/*
- * Are we messing with the content-disposition header?
+ * Are we messing with the Content-Disposition header?
*/
if ((csp->action->flags & ACTION_HIDE_CONTENT_DISPOSITION) == 0)
{
- /*Me tinks not*/
+ /* Me tinks not */
return JB_ERR_OK;
}
newval = csp->action->string[ACTION_STRING_CONTENT_DISPOSITION];
- if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
+ if ((newval == NULL) || (0 == strcmpic(newval, "block")))
{
/*
* Blocking content-disposition header
else
{
/*
- * Replacing content-disposition header
+ * Replacing Content-Disposition header
*/
freez(*header);
- *header = strdup("content-disposition: ");
- string_append(header, newval);
+ *header = strdup("Content-Disposition: ");
+ string_append(header, newval);
- if (*header == NULL)
+ if (*header != NULL)
{
- log_error(LOG_LEVEL_HEADER, "Insufficent memory. content-disposition header not fully replaced.");
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "content-disposition header crunched and replaced with: %s", *header);
+ log_error(LOG_LEVEL_HEADER,
+ "Content-Disposition header crunched and replaced with: %s", *header);
}
}
return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : server_last_modified
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_last_modified(struct client_state *csp, char **header)
+static jb_err server_last_modified(struct client_state *csp, char **header)
{
const char *newval;
char buf[BUFFER_SIZE];
#endif
struct tm *timeptr = NULL;
time_t now, last_modified;
- long int rtime;
long int days, hours, minutes, seconds;
/*
/*
* Setting Last-Modified Header to now.
*/
- get_http_time(0, buf);
+ get_http_time(0, buf, sizeof(buf));
freez(*header);
*header = strdup("Last-Modified: ");
string_append(header, buf);
if (*header == NULL)
{
- log_error(LOG_LEVEL_HEADER, "Insufficent memory. Last-Modified header got lost, boohoo.");
+ log_error(LOG_LEVEL_HEADER, "Insufficient memory. Last-Modified header got lost, boohoo.");
}
else
{
}
else if (0 == strcmpic(newval, "randomize"))
{
+ const char *header_time = *header + sizeof("Last-Modified:");
+
log_error(LOG_LEVEL_HEADER, "Randomizing: %s", *header);
now = time(NULL);
#ifdef HAVE_GMTIME_R
- timeptr = gmtime_r(&now, &gmt);
-#elif FEATURE_PTHREAD
- pthread_mutex_lock(&gmtime_mutex);
- timeptr = gmtime(&now);
- pthread_mutex_unlock(&gmtime_mutex);
+ gmtime_r(&now, &gmt);
+#elif defined(MUTEX_LOCKS_AVAILABLE)
+ privoxy_mutex_lock(&gmtime_mutex);
+ gmtime(&now);
+ privoxy_mutex_unlock(&gmtime_mutex);
#else
- timeptr = gmtime(&now);
+ gmtime(&now);
#endif
- if ((timeptr = parse_header_time(*header, &last_modified)) == NULL)
+ if (JB_ERR_OK != parse_header_time(header_time, &last_modified))
{
- log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s (crunching!)", *header);
+ log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s in %s (crunching!)", header_time, *header);
freez(*header);
}
else
{
- rtime = (long int)difftime(now, last_modified);
+ long int rtime = (long int)difftime(now, last_modified);
if (rtime)
{
+ const int negative_delta = (rtime < 0);
+
+ if (negative_delta)
+ {
+ rtime *= -1;
+ log_error(LOG_LEVEL_HEADER, "Server time in the future.");
+ }
rtime = pick_from_range(rtime);
+ if (negative_delta)
+ {
+ rtime *= -1;
+ }
last_modified += rtime;
#ifdef HAVE_GMTIME_R
timeptr = gmtime_r(&last_modified, &gmt);
-#elif FEATURE_PTHREAD
- pthread_mutex_lock(&gmtime_mutex);
+#elif defined(MUTEX_LOCKS_AVAILABLE)
+ privoxy_mutex_lock(&gmtime_mutex);
timeptr = gmtime(&last_modified);
- pthread_mutex_unlock(&gmtime_mutex);
+ privoxy_mutex_unlock(&gmtime_mutex);
#else
timeptr = gmtime(&last_modified);
#endif
- strftime(newheader, sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr);
+ if ((NULL == timeptr) || !strftime(newheader,
+ sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Randomizing '%s' failed. Crunching the header without replacement.",
+ *header);
+ freez(*header);
+ return JB_ERR_OK;
+ }
+
freez(*header);
*header = strdup("Last-Modified: ");
string_append(header, newheader);
if (*header == NULL)
{
- log_error(LOG_LEVEL_ERROR, "Insufficent memory, header crunched without replacement.");
+ log_error(LOG_LEVEL_ERROR, "Insufficient memory, header crunched without replacement.");
return JB_ERR_MEMORY;
}
- if(LOG_LEVEL_HEADER & debug) /* Save cycles if the user isn't interested. */
- {
- days = rtime / (3600 * 24);
- hours = rtime / 3600 % 24;
- minutes = rtime / 60 % 60;
- seconds = rtime % 60;
-
- log_error(LOG_LEVEL_HEADER, "Randomized: %s (added %d da%s %d hou%s %d minut%s %d second%s",
- *header, days, (days == 1) ? "y" : "ys", hours, (hours == 1) ? "r" : "rs",
- minutes, (minutes == 1) ? "e" : "es", seconds, (seconds == 1) ? ")" : "s)");
- }
+ days = rtime / (3600 * 24);
+ hours = rtime / 3600 % 24;
+ minutes = rtime / 60 % 60;
+ seconds = rtime % 60;
+
+ log_error(LOG_LEVEL_HEADER,
+ "Randomized: %s (added %d da%s %d hou%s %d minut%s %d second%s",
+ *header, days, (days == 1) ? "y" : "ys", hours, (hours == 1) ? "r" : "rs",
+ minutes, (minutes == 1) ? "e" : "es", seconds, (seconds == 1) ? ")" : "s)");
}
else
{
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_accept_encoding
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_accept_encoding(struct client_state *csp, char **header)
+static jb_err client_accept_encoding(struct client_state *csp, char **header)
{
if ((csp->action->flags & ACTION_NO_COMPRESSION) != 0)
{
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_te(struct client_state *csp, char **header)
+static jb_err client_te(struct client_state *csp, char **header)
{
if ((csp->action->flags & ACTION_NO_COMPRESSION) != 0)
{
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_referrer
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_referrer(struct client_state *csp, char **header)
+static jb_err client_referrer(struct client_state *csp, char **header)
{
- const char *newval;
- const char *host;
- char *referer;
- size_t hostlenght;
+ const char *parameter;
+ /* booleans for parameters we have to check multiple times */
+ int parameter_conditional_block;
+ int parameter_conditional_forge;
#ifdef FEATURE_FORCE_LOAD
- /* Since the referrer can include the prefix even
+ /*
+ * Since the referrer can include the prefix even
* if the request itself is non-forced, we must
- * clean it unconditionally
+ * clean it unconditionally.
+ *
+ * XXX: strclean is too broad
*/
strclean(*header, FORCE_PREFIX);
#endif /* def FEATURE_FORCE_LOAD */
- /*
- * Are we sending referer?
- */
if ((csp->action->flags & ACTION_HIDE_REFERER) == 0)
{
+ /* Nothing left to do */
return JB_ERR_OK;
}
- newval = csp->action->string[ACTION_STRING_REFERER];
+ parameter = csp->action->string[ACTION_STRING_REFERER];
+ assert(parameter != NULL);
+ parameter_conditional_block = (0 == strcmpic(parameter, "conditional-block"));
+ parameter_conditional_forge = (0 == strcmpic(parameter, "conditional-forge"));
- if ((0 != strcmpic(newval, "conditional-block")))
- {
- freez(*header);
- }
- if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
+ if (!parameter_conditional_block && !parameter_conditional_forge)
{
/*
- * Blocking referer
+ * As conditional-block and conditional-forge are the only
+ * parameters that rely on the original referrer, we can
+ * remove it now for all the others.
*/
+ freez(*header);
+ }
+
+ if (0 == strcmpic(parameter, "block"))
+ {
log_error(LOG_LEVEL_HEADER, "Referer crunched!");
return JB_ERR_OK;
}
- else if (0 == strcmpic(newval, "conditional-block"))
+ else if (parameter_conditional_block || parameter_conditional_forge)
{
- /*
- * Block referer if host has changed.
- */
-
- if (NULL == (host = strdup(csp->http->hostport)))
- {
- freez(*header);
- log_error(LOG_LEVEL_HEADER, "Referer crunched! Couldn't allocate memory for temporary host copy.");
- return JB_ERR_MEMORY;
- }
- if (NULL == (referer = strdup(*header)))
- {
- freez(*header);
- freez(host);
- log_error(LOG_LEVEL_HEADER, "Referer crunched! Couldn't allocate memory for temporary referer copy.");
- return JB_ERR_MEMORY;
- }
- hostlenght = strlen(host);
- if ( hostlenght < (strlen(referer)-17) ) /*referer begins with 'Referer: http[s]://'*/
- {
- /*Shorten referer to make sure the referer is blocked
- *if www.example.org/www.example.com-shall-see-the-referer/
- *links to www.example.com/
- */
- referer[hostlenght+17] = '\0';
- }
- if ( 0 == strstr(referer, host)) /*Host has changed*/
- {
- log_error(LOG_LEVEL_HEADER, "New host is: %s. Crunching %s!", host, *header);
- freez(*header);
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "%s (not modified, still on %s)", *header, host);
- }
- freez(referer);
- freez(host);
- return JB_ERR_OK;
+ return handle_conditional_hide_referrer_parameter(header,
+ csp->http->hostport, parameter_conditional_block);
}
- else if (0 != strcmpic(newval, "forge"))
+ else if (0 == strcmpic(parameter, "forge"))
{
- /*
- * We have a specific (fixed) referer we want to send.
- */
- if ((0 != strncmpic(newval, "http://", 7)) && (0 != strncmpic(newval, "https://", 8)))
- {
- log_error(LOG_LEVEL_HEADER, "Parameter: +referrer{%s} is a bad idea, but I don't care.", newval);
- }
- *header = strdup("Referer: ");
- string_append(header, newval);
- log_error(LOG_LEVEL_HEADER, "Referer overwritten with: %s", *header);
-
- return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
+ return create_forged_referrer(header, csp->http->hostport);
}
else
{
- /*
- * Forge a referer as http://[hostname:port of REQUEST]/
- * to fool stupid checks for in-site links
- */
-
- *header = strdup("Referer: http://");
- string_append(header, csp->http->hostport);
- string_append(header, "/");
- log_error(LOG_LEVEL_HEADER, "Referer forged to: %s", *header);
-
- return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
+ /* interpret parameter as user-supplied referer to fake */
+ return create_fake_referrer(header, parameter);
}
}
+
/*********************************************************************
*
* Function : client_accept_language
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_accept_language(struct client_state *csp, char **header)
+static jb_err client_accept_language(struct client_state *csp, char **header)
{
const char *newval;
if (*header == NULL)
{
- log_error(LOG_LEVEL_ERROR, " Insufficent memory. Accept-Language header crunched without replacement.");
+ log_error(LOG_LEVEL_ERROR,
+ "Insufficient memory. Accept-Language header crunched without replacement.");
}
else
{
- log_error(LOG_LEVEL_HEADER, "Accept-Language header crunched and replaced with: %s", *header);
+ log_error(LOG_LEVEL_HEADER,
+ "Accept-Language header crunched and replaced with: %s", *header);
}
}
return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : crunch_client_header
* Returns : JB_ERR_OK on success and always succeeds
*
*********************************************************************/
-jb_err crunch_client_header(struct client_state *csp, char **header)
+static jb_err crunch_client_header(struct client_state *csp, char **header)
{
const char *crunch_pattern;
- /*Is there a header to crunch*/
-
+
+ /* Do we feel like crunching? */
if ((csp->action->flags & ACTION_CRUNCH_CLIENT_HEADER))
{
crunch_pattern = csp->action->string[ACTION_STRING_CLIENT_HEADER];
- /*Is the current header the lucky one?*/
+ /* Is the current header the lucky one? */
if (strstr(*header, crunch_pattern))
{
log_error(LOG_LEVEL_HEADER, "Crunching client header: %s (contains: %s)", *header, crunch_pattern);
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_uagent(struct client_state *csp, char **header)
+static jb_err client_uagent(struct client_state *csp, char **header)
{
const char *newval;
return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_ua
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_ua(struct client_state *csp, char **header)
+static jb_err client_ua(struct client_state *csp, char **header)
{
if ((csp->action->flags & ACTION_HIDE_USER_AGENT) != 0)
{
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_from(struct client_state *csp, char **header)
+static jb_err client_from(struct client_state *csp, char **header)
{
const char *newval;
*
* Function : client_send_cookie
*
- * Description : Handle the "cookie" header properly. Called from `sed'.
- * If cookie is accepted, add it to the cookie_list,
- * else we crunch it. Mmmmmmmmmmm ... cookie ......
+ * Description : Crunches the "cookie" header if necessary.
+ * Called from `sed'.
+ *
+ * XXX: Stupid name, doesn't send squat.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_send_cookie(struct client_state *csp, char **header)
+static jb_err client_send_cookie(struct client_state *csp, char **header)
{
- jb_err result = JB_ERR_OK;
-
- if ((csp->action->flags & ACTION_NO_COOKIE_READ) == 0)
- {
- /* strlen("cookie: ") == 8 */
- result = enlist(csp->cookie_list, *header + 8);
- }
- else
+ if (csp->action->flags & ACTION_NO_COOKIE_READ)
{
- log_error(LOG_LEVEL_HEADER, "Crunched outgoing cookie -- yum!");
+ log_error(LOG_LEVEL_HEADER, "Crunched outgoing cookie: %s", *header);
+ freez(*header);
}
- /*
- * Always remove the cookie here. The cookie header
- * will be sent at the end of the header.
- */
- freez(*header);
-
- return result;
+ return JB_ERR_OK;
}
*********************************************************************/
jb_err client_x_forwarded(struct client_state *csp, char **header)
{
- if ((csp->action->flags & ACTION_HIDE_FORWARDED) == 0)
+ if (0 != (csp->action->flags & ACTION_CHANGE_X_FORWARDED_FOR))
{
- /* Save it so we can re-add it later */
- freez(csp->x_forwarded);
- csp->x_forwarded = *header;
+ const char *parameter = csp->action->string[ACTION_STRING_CHANGE_X_FORWARDED_FOR];
- /*
- * Always set *header = NULL, since this information
- * will be sent at the end of the header.
- */
- *header = NULL;
- }
- else
- {
- freez(*header);
- log_error(LOG_LEVEL_HEADER, "crunched x-forwarded-for!");
+ if (0 == strcmpic(parameter, "block"))
+ {
+ freez(*header);
+ log_error(LOG_LEVEL_HEADER, "crunched x-forwarded-for!");
+ }
+ else if (0 == strcmpic(parameter, "add"))
+ {
+ string_append(header, ", ");
+ string_append(header, csp->ip_addr_str);
+
+ if (*header == NULL)
+ {
+ return JB_ERR_MEMORY;
+ }
+ log_error(LOG_LEVEL_HEADER,
+ "Appended client IP address to %s", *header);
+ csp->flags |= CSP_FLAG_X_FORWARDED_FOR_APPENDED;
+ }
+ else
+ {
+ log_error(LOG_LEVEL_FATAL,
+ "Invalid change-x-forwarded-for parameter: '%s'", parameter);
+ }
}
return JB_ERR_OK;
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_max_forwards(struct client_state *csp, char **header)
+static jb_err client_max_forwards(struct client_state *csp, char **header)
{
- unsigned int max_forwards;
+ int max_forwards;
- if ((0 == strcmpic(csp->http->gpc, "trace"))
- || (0 == strcmpic(csp->http->gpc, "options")))
+ if ((0 == strcmpic(csp->http->gpc, "trace")) ||
+ (0 == strcmpic(csp->http->gpc, "options")))
{
- if (1 == sscanf(*header, "Max-Forwards: %u", &max_forwards))
+ assert(*(*header+12) == ':');
+ if (1 == sscanf(*header+12, ": %d", &max_forwards))
{
- if (max_forwards-- >= 1)
+ if (max_forwards > 0)
{
- sprintf(*header, "Max-Forwards: %u", max_forwards);
- log_error(LOG_LEVEL_HEADER, "Max forwards of %s request now %d", csp->http->gpc, max_forwards);
+ snprintf(*header, strlen(*header)+1, "Max-Forwards: %d", --max_forwards);
+ log_error(LOG_LEVEL_HEADER,
+ "Max-Forwards value for %s request reduced to %d.",
+ csp->http->gpc, max_forwards);
}
- else
+ else if (max_forwards < 0)
{
- log_error(LOG_LEVEL_ERROR, "Non-intercepted %s request with Max-Forwards zero!", csp->http->gpc);
+ log_error(LOG_LEVEL_ERROR, "Crunching invalid header: %s", *header);
+ freez(*header);
}
}
+ else
+ {
+ log_error(LOG_LEVEL_ERROR, "Crunching invalid header: %s", *header);
+ freez(*header);
+ }
}
return JB_ERR_OK;
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_host(struct client_state *csp, char **header)
+static jb_err client_host(struct client_state *csp, char **header)
{
char *p, *q;
csp->http->hostport, csp->http->host, csp->http->port);
}
+ /* Signal client_host_adder() to return right away */
+ csp->flags |= CSP_FLAG_HOST_HEADER_IS_SET;
+
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_if_modified_since
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_if_modified_since(struct client_state *csp, char **header)
+static jb_err client_if_modified_since(struct client_state *csp, char **header)
{
char newheader[50];
#ifdef HAVE_GMTIME_R
struct tm *timeptr = NULL;
time_t tm = 0;
const char *newval;
- long int rtime;
long int hours, minutes, seconds;
- int negative = 0;
char * endptr;
if ( 0 == strcmpic(*header, "If-Modified-Since: Wed, 08 Jun 1955 12:00:00 GMT"))
}
else /* add random value */
{
- if ((timeptr = parse_header_time(*header, &tm)) == NULL)
+ const char *header_time = *header + sizeof("If-Modified-Since:");
+
+ if (JB_ERR_OK != parse_header_time(header_time, &tm))
{
- log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s (crunching!)", *header);
+ log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s in %s (crunching!)", header_time, *header);
freez(*header);
}
else
{
- rtime = strtol(newval, &endptr, 0);
- if(rtime)
+ long int rtime = strtol(newval, &endptr, 0);
+ const int negative_range = (rtime < 0);
+
+ if (rtime)
{
log_error(LOG_LEVEL_HEADER, "Randomizing: %s (random range: %d minut%s)",
*header, rtime, (rtime == 1 || rtime == -1) ? "e": "es");
- if(rtime < 0)
+ if (negative_range)
{
rtime *= -1;
- negative = 1;
}
rtime *= 60;
rtime = pick_from_range(rtime);
log_error(LOG_LEVEL_ERROR, "Random range is 0. Assuming time transformation test.",
*header);
}
- tm += rtime * (negative ? -1 : 1);
+ tm += rtime * (negative_range ? -1 : 1);
#ifdef HAVE_GMTIME_R
timeptr = gmtime_r(&tm, &gmt);
-#elif FEATURE_PTHREAD
- pthread_mutex_lock(&gmtime_mutex);
+#elif defined(MUTEX_LOCKS_AVAILABLE)
+ privoxy_mutex_lock(&gmtime_mutex);
timeptr = gmtime(&tm);
- pthread_mutex_unlock(&gmtime_mutex);
+ privoxy_mutex_unlock(&gmtime_mutex);
#else
timeptr = gmtime(&tm);
#endif
- strftime(newheader, sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr);
+ if ((NULL == timeptr) || !strftime(newheader,
+ sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr))
+ {
+ log_error(LOG_LEVEL_ERROR,
+ "Randomizing '%s' failed. Crunching the header without replacement.",
+ *header);
+ freez(*header);
+ return JB_ERR_OK;
+ }
freez(*header);
*header = strdup("If-Modified-Since: ");
if (*header == NULL)
{
- log_error(LOG_LEVEL_HEADER, "Insufficent memory, header crunched without replacement.");
+ log_error(LOG_LEVEL_HEADER, "Insufficient memory, header crunched without replacement.");
return JB_ERR_MEMORY;
}
- if(LOG_LEVEL_HEADER & debug) /* Save cycles if the user isn't interested. */
- {
- hours = rtime / 3600;
- minutes = rtime / 60 % 60;
- seconds = rtime % 60;
+ hours = rtime / 3600;
+ minutes = rtime / 60 % 60;
+ seconds = rtime % 60;
- log_error(LOG_LEVEL_HEADER, "Randomized: %s (%s %d hou%s %d minut%s %d second%s",
- *header, (negative) ? "subtracted" : "added", hours, (hours == 1) ? "r" : "rs",
- minutes, (minutes == 1) ? "e" : "es", seconds, (seconds == 1) ? ")" : "s)");
- }
+ log_error(LOG_LEVEL_HEADER,
+ "Randomized: %s (%s %d hou%s %d minut%s %d second%s",
+ *header, (negative_range) ? "subtracted" : "added", hours,
+ (hours == 1) ? "r" : "rs", minutes, (minutes == 1) ? "e" : "es",
+ seconds, (seconds == 1) ? ")" : "s)");
}
}
}
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_if_none_match
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_if_none_match(struct client_state *csp, char **header)
+static jb_err client_if_none_match(struct client_state *csp, char **header)
{
if (csp->action->flags & ACTION_CRUNCH_IF_NONE_MATCH)
{
return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : client_x_filter
{
if (csp->action->flags & ACTION_FORCE_TEXT_MODE)
{
- log_error(LOG_LEVEL_HEADER, "force-text-mode overruled the client's request to fetch without filtering!");
+ log_error(LOG_LEVEL_HEADER,
+ "force-text-mode overruled the client's request to fetch without filtering!");
}
else
{
- csp->content_type = CT_TABOO;
- csp->action->flags &= ~ACTION_FILTER_SERVER_HEADERS;
- csp->action->flags &= ~ACTION_FILTER_CLIENT_HEADERS;
+ csp->content_type = CT_TABOO; /* XXX: This hack shouldn't be necessary */
+ csp->flags |= CSP_FLAG_NO_FILTERING;
log_error(LOG_LEVEL_HEADER, "Accepted the client's request to fetch without filtering.");
}
log_error(LOG_LEVEL_HEADER, "Crunching %s", *header);
return JB_ERR_OK;
}
+
+/*********************************************************************
+ *
+ * Function : client_range
+ *
+ * Description : Removes Range, Request-Range and If-Range headers if
+ * content filtering is enabled. If the client's version
+ * of the document has been altered by Privoxy, the server
+ * could interpret the range differently than the client
+ * intended in which case the user could end up with
+ * corrupted content.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ * 2 : header = On input, pointer to header to modify.
+ * On output, pointer to the modified header, or NULL
+ * to remove the header. This function frees the
+ * original string if necessary.
+ *
+ * Returns : JB_ERR_OK
+ *
+ *********************************************************************/
+static jb_err client_range(struct client_state *csp, char **header)
+{
+ if (content_filters_enabled(csp->action))
+ {
+ log_error(LOG_LEVEL_HEADER, "Content filtering is enabled."
+ " Crunching: \'%s\' to prevent range-mismatch problems.", *header);
+ freez(*header);
+ }
+
+ return JB_ERR_OK;
+}
+
/* the following functions add headers directly to the header list */
/*********************************************************************
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_host_adder(struct client_state *csp)
+static jb_err client_host_adder(struct client_state *csp)
{
char *p;
jb_err err;
+ if (csp->flags & CSP_FLAG_HOST_HEADER_IS_SET)
+ {
+ /* Header already set by the client, nothing to do. */
+ return JB_ERR_OK;
+ }
+
if ( !csp->http->hostport || !*(csp->http->hostport))
{
+ /* XXX: When does this happen and why is it OK? */
+ log_error(LOG_LEVEL_INFO, "Weirdness in client_host_adder detected and ignored.");
return JB_ERR_OK;
}
p = csp->http->hostport;
}
+ /* XXX: Just add it, we already made sure that it will be unique */
log_error(LOG_LEVEL_HEADER, "addh-unique: Host: %s", p);
err = enlist_unique_header(csp->headers, "Host", p);
return err;
}
-/*********************************************************************
- *
- * Function : client_cookie_adder
- *
- * Description : Used in the add_client_headers list. Called from `sed'.
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : JB_ERR_OK on success, or
- * JB_ERR_MEMORY on out-of-memory error.
- *
- *********************************************************************/
-jb_err client_cookie_adder(struct client_state *csp)
-{
- struct list_entry *lst;
- char *tmp;
- struct list_entry *list1 = csp->cookie_list->first;
- struct list_entry *list2 = csp->action->multi[ACTION_MULTI_WAFER]->first;
- int first_cookie = 1;
- jb_err err;
-
- if ((list1 == NULL) && (list2 == NULL))
- {
- /* Nothing to do */
- return JB_ERR_OK;
- }
-
- tmp = strdup("Cookie: ");
-
- for (lst = list1; lst ; lst = lst->next)
- {
- if (first_cookie)
- {
- first_cookie = 0;
- }
- else
- {
- string_append(&tmp, "; ");
- }
- string_append(&tmp, lst->str);
- }
-
- for (lst = list2; lst ; lst = lst->next)
- {
- if (first_cookie)
- {
- first_cookie = 0;
- }
- else
- {
- string_append(&tmp, "; ");
- }
- string_join(&tmp, cookie_encode(lst->str));
- }
-
- if (tmp == NULL)
- {
- return JB_ERR_MEMORY;
- }
-
- log_error(LOG_LEVEL_HEADER, "addh: %s", tmp);
- err = enlist(csp->headers, tmp);
- free(tmp);
- return err;
-}
-
-
+#if 0
/*********************************************************************
*
* Function : client_accept_encoding_adder
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_accept_encoding_adder(struct client_state *csp)
+static jb_err client_accept_encoding_adder(struct client_state *csp)
{
if ( ((csp->action->flags & ACTION_NO_COMPRESSION) != 0)
&& (!strcmpic(csp->http->ver, "HTTP/1.1")) )
return JB_ERR_OK;
}
+#endif
/*********************************************************************
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_xtra_adder(struct client_state *csp)
+static jb_err client_xtra_adder(struct client_state *csp)
{
struct list_entry *lst;
jb_err err;
/*********************************************************************
*
- * Function : client_x_forwarded_adder
+ * Function : client_x_forwarded_for_adder
*
* Description : Used in the add_client_headers list. Called from `sed'.
*
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err client_x_forwarded_adder(struct client_state *csp)
+static jb_err client_x_forwarded_for_adder(struct client_state *csp)
{
- char *p = NULL;
+ char *header = NULL;
jb_err err;
- if ((csp->action->flags & ACTION_HIDE_FORWARDED) != 0)
+ if (!((csp->action->flags & ACTION_CHANGE_X_FORWARDED_FOR)
+ && (0 == strcmpic(csp->action->string[ACTION_STRING_CHANGE_X_FORWARDED_FOR], "add")))
+ || (csp->flags & CSP_FLAG_X_FORWARDED_FOR_APPENDED))
{
+ /*
+ * If we aren't adding X-Forwarded-For headers,
+ * or we already appended an existing X-Forwarded-For
+ * header, there's nothing left to do here.
+ */
return JB_ERR_OK;
}
- if (csp->x_forwarded)
+ header = strdup("X-Forwarded-For: ");
+ string_append(&header, csp->ip_addr_str);
+
+ if (header == NULL)
{
- p = strdup(csp->x_forwarded);
- string_append(&p, ", ");
+ return JB_ERR_MEMORY;
}
- else
+
+ log_error(LOG_LEVEL_HEADER, "addh: %s", header);
+ err = enlist(csp->headers, header);
+ freez(header);
+
+ return err;
+}
+
+
+/*********************************************************************
+ *
+ * Function : server_connection_adder
+ *
+ * Description : Adds an appropiate "Connection:" header to csp->headers
+ * unless the header was already present. Called from `sed'.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+static jb_err server_connection_adder(struct client_state *csp)
+{
+ const unsigned int flags = csp->flags;
+ const char *response_status_line = csp->headers->first->str;
+ const char *wanted_header = get_appropiate_connection_header(csp);
+
+ if ((flags & CSP_FLAG_CLIENT_HEADER_PARSING_DONE)
+ && (flags & CSP_FLAG_SERVER_CONNECTION_HEADER_SET))
{
- p = strdup("X-Forwarded-For: ");
+ return JB_ERR_OK;
}
- string_append(&p, csp->ip_addr_str);
- if (p == NULL)
+ /*
+ * XXX: if we downgraded the response, this check will fail.
+ */
+ if ((csp->config->feature_flags &
+ RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
+ && (NULL != response_status_line)
+ && !strncmpic(response_status_line, "HTTP/1.1", 8))
{
- return JB_ERR_MEMORY;
+ log_error(LOG_LEVEL_HEADER, "A HTTP/1.1 response "
+ "without Connection header implies keep-alive.");
+ csp->flags |= CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
}
- log_error(LOG_LEVEL_HEADER, "addh: %s", p);
- err = enlist(csp->headers, p);
- free(p);
+ log_error(LOG_LEVEL_HEADER, "Adding: %s", wanted_header);
+
+ return enlist(csp->headers, wanted_header);
+}
+
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+/*********************************************************************
+ *
+ * Function : server_proxy_connection_adder
+ *
+ * Description : Adds a "Proxy-Connection: keep-alive" header to
+ * csp->headers if the client asked for keep-alive.
+ * XXX: We should reuse existant ones.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
+ *
+ *********************************************************************/
+static jb_err server_proxy_connection_adder(struct client_state *csp)
+{
+ static const char proxy_connection_header[] = "Proxy-Connection: keep-alive";
+ jb_err err = JB_ERR_OK;
+
+ if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
+ {
+ log_error(LOG_LEVEL_HEADER, "Adding: %s", proxy_connection_header);
+ err = enlist(csp->headers, proxy_connection_header);
+ }
return err;
}
+#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
/*********************************************************************
*
- * Function : connection_close_adder
+ * Function : client_connection_header_adder
*
- * Description : Adds a "Connection: close" header to csp->headers
- * as a temporary fix for the needed but missing HTTP/1.1
- * support. Called from `sed'.
- * FIXME: This whole function shouldn't be neccessary!
+ * Description : Adds a proper "Connection:" header to csp->headers
+ * unless the header was already present. Called from `sed'.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err connection_close_adder(struct client_state *csp)
+static jb_err client_connection_header_adder(struct client_state *csp)
{
- log_error(LOG_LEVEL_HEADER, "Adding: Connection: close");
- return enlist(csp->headers, "Connection: close");
+ const char *wanted_header = get_appropiate_connection_header(csp);
+
+ if (!(csp->flags & CSP_FLAG_CLIENT_HEADER_PARSING_DONE)
+ && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_HEADER_SET))
+ {
+ return JB_ERR_OK;
+ }
+
+#ifdef FEATURE_CONNECTION_KEEP_ALIVE
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
+ && (csp->http->ssl == 0))
+ {
+ csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
+ }
+#endif /* FEATURE_CONNECTION_KEEP_ALIVE */
+
+ log_error(LOG_LEVEL_HEADER, "Adding: %s", wanted_header);
+
+ return enlist(csp->headers, wanted_header);
}
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_http(struct client_state *csp, char **header)
+static jb_err server_http(struct client_state *csp, char **header)
{
sscanf(*header, "HTTP/%*d.%*d %d", &(csp->http->status));
if (csp->http->status == 206)
if ((csp->action->flags & ACTION_DOWNGRADE) != 0)
{
- (*header)[7] = '0';
- log_error(LOG_LEVEL_HEADER, "Downgraded answer to HTTP/1.0");
+ /* XXX: Should we do a real validity check here? */
+ if (strlen(*header) > 8)
+ {
+ (*header)[7] = '0';
+ log_error(LOG_LEVEL_HEADER, "Downgraded answer to HTTP/1.0");
+ }
+ else
+ {
+ /*
+ * XXX: Should we block the request or
+ * enlist a valid status code line here?
+ */
+ log_error(LOG_LEVEL_INFO, "Malformed server response detected. "
+ "Downgrading to HTTP/1.0 impossible.");
+ }
}
return JB_ERR_OK;
* Function : server_set_cookie
*
* Description : Handle the server "cookie" header properly.
- * Log cookie to the jar file. Then "crunch" it,
- * or accept it. Called from `sed'.
+ * Log cookie to the jar file. Then "crunch",
+ * accept or rewrite it to a session cookie.
+ * Called from `sed'.
+ *
+ * TODO: Allow the user to specify a new expiration
+ * time to cause the cookie to expire even before the
+ * browser is closed.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
* JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-jb_err server_set_cookie(struct client_state *csp, char **header)
+static jb_err server_set_cookie(struct client_state *csp, char **header)
{
-#ifdef FEATURE_COOKIE_JAR
- if (csp->config->jar)
- {
- /*
- * Write timestamp into outbuf.
- *
- * Complex because not all OSs have tm_gmtoff or
- * the %z field in strftime()
- */
- char tempbuf[ BUFFER_SIZE ];
- time_t now;
- struct tm tm_now;
- time (&now);
-#ifdef HAVE_LOCALTIME_R
- tm_now = *localtime_r(&now, &tm_now);
-#elif FEATURE_PTHREAD
- pthread_mutex_lock(&localtime_mutex);
- tm_now = *localtime (&now);
- pthread_mutex_unlock(&localtime_mutex);
-#else
- tm_now = *localtime (&now);
-#endif
- strftime(tempbuf, BUFFER_SIZE-6, "%b %d %H:%M:%S ", &tm_now);
+ time_t now;
+ time_t cookie_time;
- /* strlen("set-cookie: ") = 12 */
- fprintf(csp->config->jar, "%s %s\t%s\n", tempbuf, csp->http->host, *header + 12);
- }
-#endif /* def FEATURE_COOKIE_JAR */
+ time(&now);
if ((csp->action->flags & ACTION_NO_COOKIE_SET) != 0)
{
- log_error(LOG_LEVEL_HEADER, "Crunched incoming cookie -- yum!");
- return crumble(csp, header);
+ log_error(LOG_LEVEL_HEADER, "Crunching incoming cookie: %s", *header);
+ freez(*header);
}
else if ((csp->action->flags & ACTION_NO_COOKIE_KEEP) != 0)
{
next_tag = cur_tag + strlen(cur_tag);
}
- /* Is this the "Expires" tag? */
- if (strncmpic(cur_tag, "expires=", 8) == 0)
+ /*
+ * Check the expiration date to see
+ * if the cookie is still valid, if yes,
+ * rewrite it to a session cookie.
+ */
+ if ((strncmpic(cur_tag, "expires=", 8) == 0) && *(cur_tag + 8))
{
- /* Delete the tag by copying the rest of the string over it.
- * (Note that we cannot just use "strcpy(cur_tag, next_tag)",
- * since the behaviour of strcpy is undefined for overlapping
- * strings.)
- */
- memmove(cur_tag, next_tag, strlen(next_tag) + 1);
+ char *expiration_date = cur_tag + 8; /* Skip "[Ee]xpires=" */
- /* That changed the header, need to issue a log message */
- changed = 1;
+ /* Did we detect the date properly? */
+ if (JB_ERR_OK != parse_header_time(expiration_date, &cookie_time))
+ {
+ /*
+ * Nope, treat it as if it was still valid.
+ *
+ * XXX: Should we remove the whole cookie instead?
+ */
+ log_error(LOG_LEVEL_ERROR,
+ "Can't parse \'%s\', send by %s. Unsupported time format?", cur_tag, csp->http->url);
+ string_move(cur_tag, next_tag);
+ changed = 1;
+ }
+ else
+ {
+ /*
+ * Yes. Check if the cookie is still valid.
+ *
+ * If the cookie is already expired it's probably
+ * a delete cookie and even if it isn't, the browser
+ * will discard it anyway.
+ */
+
+ /*
+ * XXX: timegm() isn't available on some AmigaOS
+ * versions and our replacement doesn't work.
+ *
+ * Our options are to either:
+ *
+ * - disable session-cookies-only completely if timegm
+ * is missing,
+ *
+ * - to simply remove all expired tags, like it has
+ * been done until Privoxy 3.0.6 and to live with
+ * the consequence that it can cause login/logout
+ * problems on servers that don't validate their
+ * input properly, or
+ *
+ * - to replace it with mktime in which
+ * case there is a slight chance of valid cookies
+ * passing as already expired.
+ *
+ * This is the way it's currently done and it's not
+ * as bad as it sounds. If the missing GMT offset is
+ * enough to change the result of the expiration check
+ * the cookie will be only valid for a few hours
+ * anyway, which in many cases will be shorter
+ * than a browser session.
+ */
+ if (cookie_time - now < 0)
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Cookie \'%s\' is already expired and can pass unmodified.", *header);
+ /* Just in case some clown sets more then one expiration date */
+ cur_tag = next_tag;
+ }
+ else
+ {
+ /*
+ * Still valid, delete expiration date by copying
+ * the rest of the string over it.
+ */
+ string_move(cur_tag, next_tag);
+
+ /* That changed the header, need to issue a log message */
+ changed = 1;
+
+ /*
+ * Note that the next tag has now been moved to *cur_tag,
+ * so we do not need to update the cur_tag pointer.
+ */
+ }
+ }
- /* Note that the next tag has now been moved to *cur_tag,
- * so we do not need to update the cur_tag pointer.
- */
}
else
{
if (changed)
{
- log_error(LOG_LEVEL_HEADER, "Changed cookie to a temporary one.");
+ assert(NULL != *header);
+ log_error(LOG_LEVEL_HEADER, "Cookie rewritten to a temporary one: %s",
+ *header);
}
}
* Returns : Number of eliminations
*
*********************************************************************/
-int strclean(const char *string, const char *substring)
+int strclean(char *string, const char *substring)
{
int hits = 0;
size_t len;
}
#endif /* def FEATURE_FORCE_LOAD */
+
/*********************************************************************
*
* Function : parse_header_time
*
- * Description : Transforms time inside a HTTP header into
- * the usual time format.
+ * Description : Parses time formats used in HTTP header strings
+ * to get the numerical respresentation.
*
* Parameters :
- * 1 : header = header to parse
- * 2 : tm = storage for the resulting time in seconds
+ * 1 : header_time = HTTP header time as string.
+ * 2 : result = storage for header_time in seconds
*
- * Returns : Time struct containing the header time, or
- * NULL in case of a parsing problems.
+ * Returns : JB_ERR_OK if the time format was recognized, or
+ * JB_ERR_PARSE otherwise.
*
*********************************************************************/
-struct tm *parse_header_time(char *header, time_t *tm) {
-
- char * timestring;
+static jb_err parse_header_time(const char *header_time, time_t *result)
+{
struct tm gmt;
- struct tm * timeptr;
/*
- * Initializing gmt to prevent time zone offsets.
+ * Zero out gmt to prevent time zone offsets.
*
* While this is only necessary on some platforms
* (mingw32 for example), I don't know how to
* detect these automatically and doing it everywhere
* shouldn't hurt.
*/
- time(tm);
-#ifdef HAVE_LOCALTIME_R
- gmt = *localtime_r(tm, &gmt);
-#elif FEATURE_PTHREAD
- pthread_mutex_lock(&localtime_mutex);
- gmt = *localtime(tm);
- pthread_mutex_unlock(&localtime_mutex);
-#else
- gmt = *localtime(tm);
-#endif
-
- /* Skipping header name */
- timestring = strstr(header, ": ");
- if (strptime(timestring, ": %a, %d %b %Y %H:%M:%S", &gmt) == NULL)
- {
- timeptr = NULL;
- }
- else
+ memset(&gmt, 0, sizeof(gmt));
+
+ /* Tue, 02 Jun 2037 20:00:00 */
+ if ((NULL == strptime(header_time, "%a, %d %b %Y %H:%M:%S", &gmt))
+ /* Tue, 02-Jun-2037 20:00:00 */
+ && (NULL == strptime(header_time, "%a, %d-%b-%Y %H:%M:%S", &gmt))
+ /* Tue, 02-Jun-37 20:00:00 */
+ && (NULL == strptime(header_time, "%a, %d-%b-%y %H:%M:%S", &gmt))
+ /* Tuesday, 02-Jun-2037 20:00:00 */
+ && (NULL == strptime(header_time, "%A, %d-%b-%Y %H:%M:%S", &gmt))
+ /* Tuesday Jun 02 20:00:00 2037 */
+ && (NULL == strptime(header_time, "%A %b %d %H:%M:%S %Y", &gmt)))
{
- *tm = timegm(&gmt);
- timeptr = &gmt;
+ return JB_ERR_PARSE;
}
- return(timeptr);
+
+ *result = timegm(&gmt);
+
+ return JB_ERR_OK;
}
+
/*********************************************************************
*
* Function : get_destination_from_headers
}
+/*********************************************************************
+ *
+ * Function : create_forged_referrer
+ *
+ * Description : Helper for client_referrer to forge a referer as
+ * 'http://[hostname:port/' to fool stupid
+ * checks for in-site links
+ *
+ * Parameters :
+ * 1 : header = Pointer to header pointer
+ * 2 : hostport = Host and optionally port as string
+ *
+ * Returns : JB_ERR_OK in case of success, or
+ * JB_ERR_MEMORY in case of memory problems.
+ *
+ *********************************************************************/
+static jb_err create_forged_referrer(char **header, const char *hostport)
+{
+ assert(NULL == *header);
+
+ *header = strdup("Referer: http://");
+ string_append(header, hostport);
+ string_append(header, "/");
+
+ if (NULL == *header)
+ {
+ return JB_ERR_MEMORY;
+ }
+
+ log_error(LOG_LEVEL_HEADER, "Referer forged to: %s", *header);
+
+ return JB_ERR_OK;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : create_fake_referrer
+ *
+ * Description : Helper for client_referrer to create a fake referrer
+ * based on a string supplied by the user.
+ *
+ * Parameters :
+ * 1 : header = Pointer to header pointer
+ * 2 : hosthost = Referrer to fake
+ *
+ * Returns : JB_ERR_OK in case of success, or
+ * JB_ERR_MEMORY in case of memory problems.
+ *
+ *********************************************************************/
+static jb_err create_fake_referrer(char **header, const char *fake_referrer)
+{
+ assert(NULL == *header);
+
+ if ((0 != strncmpic(fake_referrer, "http://", 7)) && (0 != strncmpic(fake_referrer, "https://", 8)))
+ {
+ log_error(LOG_LEVEL_HEADER,
+ "Parameter: +hide-referrer{%s} is a bad idea, but I don't care.", fake_referrer);
+ }
+ *header = strdup("Referer: ");
+ string_append(header, fake_referrer);
+
+ if (NULL == *header)
+ {
+ return JB_ERR_MEMORY;
+ }
+
+ log_error(LOG_LEVEL_HEADER, "Referer replaced with: %s", *header);
+
+ return JB_ERR_OK;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : handle_conditional_hide_referrer_parameter
+ *
+ * Description : Helper for client_referrer to crunch or forge
+ * the referrer header if the host has changed.
+ *
+ * Parameters :
+ * 1 : header = Pointer to header pointer
+ * 2 : host = The target host (may include the port)
+ * 3 : parameter_conditional_block = Boolean to signal
+ * if we're in conditional-block mode. If not set,
+ * we're in conditional-forge mode.
+ *
+ * Returns : JB_ERR_OK in case of success, or
+ * JB_ERR_MEMORY in case of memory problems.
+ *
+ *********************************************************************/
+static jb_err handle_conditional_hide_referrer_parameter(char **header,
+ const char *host, const int parameter_conditional_block)
+{
+ char *referer = strdup(*header);
+ const size_t hostlenght = strlen(host);
+ const char *referer_url = NULL;
+
+ if (NULL == referer)
+ {
+ freez(*header);
+ return JB_ERR_MEMORY;
+ }
+
+ /* referer begins with 'Referer: http[s]://' */
+ if ((hostlenght+17) < strlen(referer))
+ {
+ /*
+ * Shorten referer to make sure the referer is blocked
+ * if www.example.org/www.example.com-shall-see-the-referer/
+ * links to www.example.com/
+ */
+ referer[hostlenght+17] = '\0';
+ }
+ referer_url = strstr(referer, "http://");
+ if ((NULL == referer_url) || (NULL == strstr(referer_url, host)))
+ {
+ /* Host has changed, Referer is invalid or a https URL. */
+ if (parameter_conditional_block)
+ {
+ log_error(LOG_LEVEL_HEADER, "New host is: %s. Crunching %s!", host, *header);
+ freez(*header);
+ }
+ else
+ {
+ freez(*header);
+ freez(referer);
+ return create_forged_referrer(header, host);
+ }
+ }
+ freez(referer);
+
+ return JB_ERR_OK;
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : get_appropiate_connection_header
+ *
+ * Description : Returns an appropiate Connection header
+ * depending on whether or not we try to keep
+ * the connection to the server alive.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : Pointer to statically allocated header buffer.
+ *
+ *********************************************************************/
+static const char *get_appropiate_connection_header(const struct client_state *csp)
+{
+ static const char connection_keep_alive[] = "Connection: keep-alive";
+ static const char connection_close[] = "Connection: close";
+
+ if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
+ && (csp->http->ssl == 0))
+ {
+ return connection_keep_alive;
+ }
+ return connection_close;
+}
+
+
+/*********************************************************************
+ *
+ * Function : create_content_length_header
+ *
+ * Description : Creates a Content-Length header.
+ *
+ * Parameters :
+ * 1 : content_length = The content length to be used in the header.
+ * 2 : header = Allocated space to safe the header.
+ * 3 : buffer_length = The length of the allocated space.
+ *
+ * Returns : void
+ *
+ *********************************************************************/
+static void create_content_length_header(unsigned long long content_length,
+ char *header, size_t buffer_length)
+{
+ snprintf(header, buffer_length, "Content-Length: %llu", content_length);
+}
+
+
/*
Local Variables:
tab-width: 3