const char parsers_rcs[] = "$Id: parsers.c,v 1.90 2007/02/08 19:12:35 fabiankeil Exp $"; /********************************************************************* * * File : $Source: /cvsroot/ijbswa/current/parsers.c,v $ * * Purpose : Declares functions to parse/crunch headers and pages. * Functions declared include: * `add_to_iob', `client_cookie_adder', `client_from', * `client_referrer', `client_send_cookie', `client_ua', * `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', * `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'. * * Copyright : Written by and Copyright (C) 2001-2007 the SourceForge * Privoxy team. http://www.privoxy.org/ * * Based on the Internet Junkbuster originally written * by and Copyright (C) 1997 Anonymous Coders and * Junkbusters Corporation. http://www.junkbusters.com * * This program is free software; you can redistribute it * and/or modify it under the terms of the GNU General * Public License as published by the Free Software * Foundation; either version 2 of the License, or (at * your option) any later version. * * This program is distributed in the hope that it will * be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A * PARTICULAR PURPOSE. See the GNU General Public * License for more details. * * The GNU General Public License should be included with * this file. If not, you can view it at * http://www.gnu.org/copyleft/gpl.html * or write to the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * Revisions : * $Log: parsers.c,v $ * Revision 1.90 2007/02/08 19:12:35 fabiankeil * Don't run server_content_length() the first time * sed() parses server headers; only adjust the * Content-Length header if the page was modified. * * Revision 1.89 2007/02/07 16:52:11 fabiankeil * Fix log messages regarding the cookie time format * (cookie and request URL were mixed up). * * Revision 1.88 2007/02/07 11:27:12 fabiankeil * - Let decompress_iob() * - not corrupt the content if decompression fails * early. (the first byte(s) were lost). * - use pointer arithmetics with defined outcome for * a change. * - Use a different kludge to remember a failed decompression. * * Revision 1.87 2007/01/31 16:21:38 fabiankeil * Search for Max-Forwards headers case-insensitive, * don't generate the "501 unsupported" message for invalid * Max-Forwards values and don't increase negative ones. * * Revision 1.86 2007/01/30 13:05:26 fabiankeil * - Let server_set_cookie() check the expiration date * of cookies and don't touch the ones that are already * expired. Fixes problems with low quality web applications * as described in BR 932612. * * - Adjust comment in client_max_forwards to reality; * remove invalid Max-Forwards headers. * * Revision 1.85 2007/01/26 15:33:46 fabiankeil * Stop filter_header() from unintentionally removing * empty header lines that were enlisted by the continue * hack. * * Revision 1.84 2007/01/24 12:56:52 fabiankeil * - Repeat the request URL before logging any headers. * Makes reading the log easier in case of simultaneous requests. * - If there are more than one Content-Type headers in one request, * use the first one and remove the others. * - Remove "newval" variable in server_content_type(). * It's only used once. * * Revision 1.83 2007/01/12 15:03:02 fabiankeil * Correct a cast, check inflateEnd() exit code * to see if we have to, replace sprintf calls * with snprintf. * * Revision 1.82 2007/01/01 19:36:37 fabiankeil * Integrate a modified version of Wil Mahan's * zlib patch (PR #895531). * * Revision 1.81 2006/12/31 22:21:33 fabiankeil * Skip empty filter files in filter_header() * but don't ignore the ones that come afterwards. * Fixes BR 1619208, this time for real. * * Revision 1.80 2006/12/29 19:08:22 fabiankeil * Reverted parts of my last commit * to keep error handling working. * * Revision 1.79 2006/12/29 18:04:40 fabiankeil * Fixed gcc43 conversion warnings. * * Revision 1.78 2006/12/26 17:19:20 fabiankeil * Bringing back the "useless" localtime() call * I removed in revision 1.67. On some platforms * it's necessary to prevent time zone offsets. * * Revision 1.77 2006/12/07 18:44:26 fabiankeil * Rebuild request URL in get_destination_from_headers() * to make sure redirect{pcrs command} works as expected * for intercepted requests. * * Revision 1.76 2006/12/06 19:52:25 fabiankeil * Added get_destination_from_headers(). * * Revision 1.75 2006/11/13 19:05:51 fabiankeil * Make pthread mutex locking more generic. Instead of * checking for OSX and OpenBSD, check for FEATURE_PTHREAD * and use mutex locking unless there is an _r function * available. Better safe than sorry. * * Fixes "./configure --disable-pthread" and should result * in less threading-related problems on pthread-using platforms, * but it still doesn't fix BR#1122404. * * Revision 1.74 2006/10/02 16:59:12 fabiankeil * The special header "X-Filter: No" now disables * header filtering as well. * * Revision 1.73 2006/09/23 13:26:38 roro * Replace TABs by spaces in source code. * * Revision 1.72 2006/09/23 12:37:21 fabiankeil * Don't print a log message every time filter_headers is * entered or left. It only creates noise without any real * information. * * Revision 1.71 2006/09/21 19:55:17 fabiankeil * Fix +hide-if-modified-since{-n}. * * Revision 1.70 2006/09/08 12:06:34 fabiankeil * Have hide-if-modified-since interpret the random * range value as minutes instead of hours. Allows * more fine-grained configuration. * * Revision 1.69 2006/09/06 16:25:51 fabiankeil * Always have parse_header_time return a pointer * that actual makes sense, even though we currently * only need it to detect problems. * * Revision 1.68 2006/09/06 10:43:32 fabiankeil * Added config option enable-remote-http-toggle * to specify if Privoxy should recognize special * headers (currently only X-Filter) to change its * behaviour. Disabled by default. * * Revision 1.67 2006/09/04 11:01:26 fabiankeil * After filtering de-chunked instances, remove * "Transfer-Encoding" header entirely instead of changing * it to "Transfer-Encoding: identity", which is invalid. * Thanks Michael Shields . 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: http://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 pthreads 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 * * *********************************************************************/ #include "config.h" #ifndef _WIN32 #include #include #endif #include #include #include #include #include #ifdef FEATURE_ZLIB #include #endif #if !defined(_WIN32) && !defined(__OS2__) #include #endif #include "project.h" #ifdef FEATURE_PTHREAD #include "jcc.h" /* jcc.h is for mutex semapores only */ #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" #ifndef HAVE_STRPTIME #include "strptime.h" #endif const char parsers_h_rcs[] = PARSERS_H_VERSION; /* 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 * 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". * * Why did they write a character function that can't take a simple * "char" argument? Doh! */ #define ijb_isupper(__X) isupper((int)(unsigned char)(__X)) #define ijb_tolower(__X) tolower((int)(unsigned char)(__X)) const struct parsers client_patterns[] = { { "referer:", 8, client_referrer }, { "user-agent:", 11, client_uagent }, { "ua-", 3, client_ua }, { "from:", 5, client_from }, { "cookie:", 7, client_send_cookie }, { "x-forwarded-for:", 16, client_x_forwarded }, { "Accept-Encoding:", 16, client_accept_encoding }, { "TE:", 3, client_te }, { "Host:", 5, client_host }, { "if-modified-since:", 18, client_if_modified_since }, { "Keep-Alive:", 11, crumble }, { "connection:", 11, crumble }, { "proxy-connection:", 17, crumble }, { "max-forwards:", 13, client_max_forwards }, { "Accept-Language:", 16, client_accept_language }, { "if-none-match:", 14, client_if_none_match }, { "X-Filter:", 9, client_x_filter }, { "*", 0, crunch_client_header }, { "*", 0, filter_client_header }, { NULL, 0, NULL } }; const struct parsers server_patterns[] = { { "HTTP", 4, server_http }, { "set-cookie:", 11, server_set_cookie }, { "connection:", 11, crumble }, { "Content-Type:", 13, server_content_type }, { "Content-MD5:", 12, server_content_md5 }, { "Content-Encoding:", 17, server_content_encoding }, { "Transfer-Encoding:", 18, server_transfer_coding }, { "Keep-Alive:", 11, crumble }, { "content-disposition:", 20, server_content_disposition }, { "Last-Modified:", 14, server_last_modified }, { "*", 0, crunch_server_header }, { "*", 0, filter_server_header }, { NULL, 0, NULL } }; const struct parsers server_patterns_light[] = { { "Content-Length:", 15, server_content_length }, { "Transfer-Encoding:", 18, server_transfer_coding }, #ifdef FEATURE_ZLIB { "Content-Encoding:", 17, server_content_encoding }, #endif /* def FEATURE_ZLIB */ { NULL, 0, NULL } }; const add_header_func_ptr add_client_headers[] = { client_host_adder, client_cookie_adder, client_x_forwarded_adder, client_xtra_adder, /* Temporarily disabled: client_accept_encoding_adder, */ connection_close_adder, NULL }; const add_header_func_ptr add_server_headers[] = { connection_close_adder, NULL }; /********************************************************************* * * Function : flush_socket * * Description : Write any pending "buffered" content. * * Parameters : * 1 : fd = file descriptor of the socket to read * 2 : csp = Current client state (buffers, headers, etc...) * * Returns : On success, the number of bytes written are returned (zero * indicates nothing was written). On error, -1 is returned, * and errno is set appropriately. If count is zero and the * file descriptor refers to a regular file, 0 will be * returned without causing any other effect. For a special * file, the results are not portable. * *********************************************************************/ int flush_socket(jb_socket fd, struct client_state *csp) { struct iob *iob = csp->iob; int len = iob->eod - iob->cur; if (len <= 0) { return(0); } if (write_socket(fd, iob->cur, (size_t)len)) { return(-1); } iob->eod = iob->cur = iob->buf; return(len); } /********************************************************************* * * Function : add_to_iob * * Description : Add content to the buffered page, expanding the * buffer if necessary. * * Parameters : * 1 : csp = Current client state (buffers, headers, etc...) * 2 : buf = holds the content to be added to the page * 3 : n = number of bytes to be added * * Returns : JB_ERR_OK on success, JB_ERR_MEMORY if out-of-memory * or buffer limit reached. * *********************************************************************/ jb_err add_to_iob(struct client_state *csp, char *buf, int n) { struct iob *iob = csp->iob; size_t used, offset, need, want; char *p; if (n <= 0) return JB_ERR_OK; used = (size_t)(iob->eod - iob->buf); offset = (size_t)(iob->cur - iob->buf); need = used + (size_t)n + 1; /* * If the buffer can't hold the new data, extend it first. * Use the next power of two if possible, else use the actual need. */ if (need > csp->config->buffer_limit) { log_error(LOG_LEVEL_ERROR, "Buffer limit reached while extending the buffer (iob)"); return JB_ERR_MEMORY; } if (need > iob->size) { for (want = csp->iob->size ? csp->iob->size : 512; want <= need;) want *= 2; if (want <= csp->config->buffer_limit && NULL != (p = (char *)realloc(iob->buf, want))) { iob->size = want; } else if (NULL != (p = (char *)realloc(iob->buf, need))) { iob->size = need; } else { log_error(LOG_LEVEL_ERROR, "Extending the buffer (iob) failed: %E"); return JB_ERR_MEMORY; } /* Update the iob pointers */ iob->cur = p + offset; iob->eod = p + used; iob->buf = p; } /* copy the new data into the iob buffer */ memcpy(iob->eod, buf, (size_t)n); /* point to the end of the data */ iob->eod += n; /* null terminate == cheap insurance */ *iob->eod = '\0'; return JB_ERR_OK; } #ifdef FEATURE_ZLIB /********************************************************************* * * Function : decompress_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 : JB_ERR_OK on success, * JB_ERR_MEMORY if out-of-memory limit reached, and * JB_ERR_COMPRESS if error decompressing buffer. * *********************************************************************/ jb_err decompress_iob(struct client_state *csp) { 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 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 */ bufsize = csp->iob->size; skip_size = (size_t)(csp->iob->cur - csp->iob->buf); cur = csp->iob->cur; if (bufsize < 10) { /* * 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; } 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. */ /* * Strip off the gzip header. Please see RFC 1952 for more * explanation of the appropriate fields. */ if ((*cur++ != (char)0x1f) || (*cur++ != (char)0x8b) || (*cur++ != Z_DEFLATED)) { log_error (LOG_LEVEL_ERROR, "Invalid gzip header when decompressing"); return JB_ERR_COMPRESS; } else { int flags = *cur++; /* * XXX: These magic numbers should be replaced * with macros to give a better idea what they do. */ if (flags & 0xe0) { /* The gzip header has reserved bits set; bail out. */ log_error (LOG_LEVEL_ERROR, "Invalid gzip header flags when decompressing"); return JB_ERR_COMPRESS; } cur += 6; /* Skip extra fields if necessary. */ if (flags & 0x04) { /* * Skip a given number of bytes, specified * as a 16-bit little-endian value. */ /* * XXX: This code used to be: * * csp->iob->cur += *csp->iob->cur++ + (*csp->iob->cur++ << 8); * * which I had to change into: * * cur += *cur++ + (*cur++ << 8); * * at which point gcc43 finally noticed that the value * of cur is undefined (it depends on which of the * summands is evaluated first). * * I haven't come across a site where this * code is actually executed yet, but I hope * it works anyway. */ int skip_bytes; skip_bytes = *cur++; skip_bytes = *cur++ << 8; assert(skip_bytes == *csp->iob->cur-2 + ((*csp->iob->cur-1) << 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 & 0x08) { /* A null-terminated string follows. */ while (*cur++); } /* Skip the comment if necessary. */ if (flags & 0x10) { while (*cur++); } /* Skip the CRC if necessary. */ if (flags & 0x02) { cur += 2; } } } 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; } /* 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; /* * 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; } /* * 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. */ 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; /* Try to decompress the whole stream in one shot. */ while (Z_BUF_ERROR == (status = inflate(&zstr, Z_FINISH))) { /* We need to allocate more memory for the output buffer. */ char *tmpbuf; /* used for realloc'ing the buffer */ size_t oldbufsize = bufsize; /* keep track of the old bufsize */ /* * If zlib wants more data then there's a problem, because * the complete compressed file should have been buffered. */ if (0 == zstr.avail_in) { log_error(LOG_LEVEL_ERROR, "Unexpected end of compressed iob"); return JB_ERR_COMPRESS; } /* * If we tried the limit and still didn't have enough * memory, just give up. */ if (bufsize == csp->config->buffer_limit) { log_error(LOG_LEVEL_ERROR, "Buffer limit reached while decompressing iob"); return JB_ERR_MEMORY; } /* 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 > 0); buf = tmpbuf; } } if (Z_STREAM_ERROR == inflateEnd(&zstr)) { 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. */ } if (status != Z_STREAM_END) { /* We failed to decompress the stream. */ log_error(LOG_LEVEL_ERROR, "Error in 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)) { char t = csp->iob->cur[100]; csp->iob->cur[100] = '\0'; /* * XXX: The debug level should be lowered * before the next stable release. */ log_error(LOG_LEVEL_INFO, "Sucessfully decompressed: %s", csp->iob->cur); csp->iob->cur[100] = t; return JB_ERR_OK; } 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; } } #endif /* defined(FEATURE_ZLIB) */ /********************************************************************* * * Function : get_header * * Description : This (odd) routine will parse the csp->iob * * 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. * *********************************************************************/ char *get_header(struct client_state *csp) { struct iob *iob; char *p, *q, *ret; iob = csp->iob; 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()"); } 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 = (char *) (cur_entry->str + length); while (*ret && ijb_isspace(*ret)) ret++; return(ret); } } } /* * Not found */ return 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; /* * If filtering is enabled, sed is run twice, * but most of the work needs to be done only once. */ first_run = (more_headers != NULL ) ? 1 : 0; if (first_run) /* Parse and print */ { log_error(LOG_LEVEL_HEADER, "scanning headers for: %s", csp->http->url); 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; if (v == pats) log_error(LOG_LEVEL_HEADER, "scan: %s", p->str); /* 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++) { err = (*f)(csp); } } else /* Parse only */ { /* * The second run is only needed if the body was modified * and the content-lenght has changed. */ if (strncmpic(csp->http->cmd, "HEAD", 4)) { /*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; /* Does the current parser handle this header? */ if (strncmpic(p->str, v->str, v->len) == 0) { err = v->parser(csp, (char **)&(p->str)); } } } } } if (err != JB_ERR_OK) { return NULL; } return list_to_text(csp->headers); } /* here begins the family of parser functions that reformat header lines */ /********************************************************************* * * Function : filter_server_header * * Description : Checks if server header filtering is enabled. * If it is, filter_header is called to do the work. * * 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 * *********************************************************************/ jb_err filter_server_header(struct client_state *csp, char **header) { if (csp->action->flags & ACTION_FILTER_SERVER_HEADERS) { filter_header(csp, header); } return(JB_ERR_OK); } /********************************************************************* * * Function : filter_client_header * * Description : Checks if client header filtering is enabled. * If it is, filter_header is called to do the work. * * 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 * *********************************************************************/ jb_err filter_client_header(struct client_state *csp, char **header) { if (csp->action->flags & ACTION_FILTER_CLIENT_HEADERS) { filter_header(csp, header); } return(JB_ERR_OK); } /********************************************************************* * * Function : filter_header * * Description : Executes all text substitutions from all applying * +filter actions on the header. * Most of the code was copied from pcrs_filter_response, * including the rather short variable names * * 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 * *********************************************************************/ jb_err filter_header(struct client_state *csp, char **header) { int hits=0; int matches; size_t size = strlen(*header); char *newheader = NULL; pcrs_job *job; struct file_list *fl; struct re_filterfile_spec *b; struct list_entry *filtername; int i, found_filters = 0; /* * Need to check the set of re_filterfiles... */ 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, "Unable to get current state of regexp filtering."); 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 applying +filter actions, look if a filter by that * name exists and if yes, execute its pcrs_joblist on the * buffer. */ for (b = fl->f; b; b = b->next) { for (filtername = csp->action->multi[ACTION_MULTI_FILTER]->first; filtername ; filtername = filtername->next) { if (strcmp(b->name, filtername->str) == 0) { int current_hits = 0; if ( NULL == b->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...", *header, size, b->name); /* Apply all jobs from the joblist */ for (job = b->joblist; NULL != job; job = job->next) { matches = pcrs_execute(job, *header, size, &newheader, &size); if ( 0 < matches ) { current_hits += matches; log_error(LOG_LEVEL_HEADER, "Transforming \"%s\" to \"%s\"", *header, newheader); freez(*header); *header = newheader; } else if ( 0 == matches ) { /* Filter doesn't change header */ freez(newheader); } else { /* 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) { 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); hits += current_hits; } } } } /* * 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 : crumble * * Description : This is called if a header matches a pattern to "crunch" * * 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. * *********************************************************************/ jb_err crumble(struct client_state *csp, char **header) { log_error(LOG_LEVEL_HEADER, "crumble crunched: %s!", *header); freez(*header); return JB_ERR_OK; } /********************************************************************* * * Function : crunch_server_header * * Description : Crunch server header if it matches a string supplied by the * user. Called from `sed'. * * 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 * *********************************************************************/ jb_err crunch_server_header(struct client_state *csp, char **header) { const char *crunch_pattern; /*Is there a header to crunch*/ if ((csp->action->flags & ACTION_CRUNCH_SERVER_HEADER)) { crunch_pattern = csp->action->string[ACTION_STRING_SERVER_HEADER]; /*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); freez(*header); } } return JB_ERR_OK; } /********************************************************************* * * Function : server_content_type * * Description : Set the content-type for filterable types (text/.*, * .*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 * set CT_TEXT for it. * * 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. * *********************************************************************/ jb_err server_content_type(struct client_state *csp, char **header) { /* Remove header if it isn't the first Content-Type header */ if(csp->content_type && (csp->content_type != CT_TABOO)) { /* * 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; } 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; } } /* * Are we enabling text mode by force? */ if (csp->action->flags & ACTION_FORCE_TEXT_MODE) { /* * Do we really have to? */ if (csp->content_type & CT_TEXT) { log_error(LOG_LEVEL_HEADER, "Text mode is already enabled."); } else { csp->content_type |= CT_TEXT; log_error(LOG_LEVEL_HEADER, "Text mode enabled by force. Take cover!"); } } /* * 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, 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 text. " "Enable force-text-mode if you know what you're doing.", *header); } } return JB_ERR_OK; } /********************************************************************* * * Function : server_transfer_coding * * Description : - Prohibit filtering (CT_TABOO) if transfer coding compresses * - Raise the CSP_FLAG_CHUNKED flag if coding is "chunked" * - Remove header if body was chunked but has been * de-chunked for filtering. * * 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. * *********************************************************************/ 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; } /* * Raise flag if body chunked */ if (strstr(*header, "chunked")) { csp->flags |= CSP_FLAG_CHUNKED; /* * If the body was modified, it has been de-chunked first * 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) { log_error(LOG_LEVEL_HEADER, "Removing: %s", *header); freez(*header); } } return JB_ERR_OK; } /********************************************************************* * * Function : server_content_encoding * * 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...) * 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. * *********************************************************************/ jb_err server_content_encoding(struct client_state *csp, char **header) { #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")) { /* * Body is compressed, turn off pcrs and gif filtering. */ csp->content_type |= CT_TABOO; } #endif /* !defined(FEATURE_ZLIB) */ return JB_ERR_OK; } /********************************************************************* * * Function : server_content_length * * Description : Adjust Content-Length header if we modified * the body. * * 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. * *********************************************************************/ jb_err server_content_length(struct client_state *csp, char **header) { const size_t max_header_length = 80; /* Regenerate header if the content was modified. */ if (csp->flags & CSP_FLAG_MODIFIED) { freez(*header); *header = (char *) zalloc(max_header_length); if (*header == NULL) { return JB_ERR_MEMORY; } snprintf(*header, max_header_length, "Content-Length: %d", (int)csp->content_length); log_error(LOG_LEVEL_HEADER, "Adjusted Content-Length to %d", (int)csp->content_length); } return JB_ERR_OK; } /********************************************************************* * * Function : server_content_md5 * * Description : Crumble any Content-MD5 headers if the document was * modified. FIXME: Should we re-compute instead? * * 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. * *********************************************************************/ jb_err server_content_md5(struct client_state *csp, char **header) { if (csp->flags & CSP_FLAG_MODIFIED) { log_error(LOG_LEVEL_HEADER, "Crunching Content-MD5"); freez(*header); } return JB_ERR_OK; } /********************************************************************* * * Function : server_content_disposition * * Description : If enabled, blocks or modifies the "content-disposition" header. * Called from `sed'. * * 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. * *********************************************************************/ jb_err server_content_disposition(struct client_state *csp, char **header) { const char *newval; /* * Are we messing with the content-disposition header? */ if ((csp->action->flags & ACTION_HIDE_CONTENT_DISPOSITION) == 0) { /*Me tinks not*/ return JB_ERR_OK; } newval = csp->action->string[ACTION_STRING_CONTENT_DISPOSITION]; if ((newval == NULL) || (0 == strcmpic(newval, "block")) ) { /* * Blocking content-disposition header */ log_error(LOG_LEVEL_HEADER, "Crunching %s!", *header); freez(*header); return JB_ERR_OK; } else { /* * Replacing content-disposition header */ freez(*header); *header = strdup("content-disposition: "); string_append(header, newval); 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); } } return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK; } /********************************************************************* * * Function : server_last_modified * * Description : Changes Last-Modified header to the actual date * to help hide-if-modified-since. * Called from `sed'. * * 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. * *********************************************************************/ jb_err server_last_modified(struct client_state *csp, char **header) { const char *newval; char buf[BUFFER_SIZE]; char newheader[50]; #ifdef HAVE_GMTIME_R struct tm gmt; #endif struct tm *timeptr = NULL; time_t now, last_modified; long int rtime; long int days, hours, minutes, seconds; /* * Are we messing with the Last-Modified header? */ if ((csp->action->flags & ACTION_OVERWRITE_LAST_MODIFIED) == 0) { /*Nope*/ return JB_ERR_OK; } newval = csp->action->string[ACTION_STRING_LAST_MODIFIED]; if (0 == strcmpic(newval, "block") ) { /* * Blocking Last-Modified header. Useless but why not. */ log_error(LOG_LEVEL_HEADER, "Crunching %s!", *header); freez(*header); return JB_ERR_OK; } else if (0 == strcmpic(newval, "reset-to-request-time")) { /* * Setting Last-Modified Header to now. */ get_http_time(0, 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."); } else { log_error(LOG_LEVEL_HEADER, "Reset to present time: %s", *header); } } else if (0 == strcmpic(newval, "randomize")) { 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); #else timeptr = gmtime(&now); #endif if ((timeptr = parse_header_time(*header, &last_modified)) == NULL) { log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s (crunching!)", *header); freez(*header); } else { rtime = (long int)difftime(now, last_modified); if (rtime) { rtime = pick_from_range(rtime); last_modified += rtime; #ifdef HAVE_GMTIME_R timeptr = gmtime_r(&last_modified, &gmt); #elif FEATURE_PTHREAD pthread_mutex_lock(&gmtime_mutex); timeptr = gmtime(&last_modified); pthread_mutex_unlock(&gmtime_mutex); #else timeptr = gmtime(&last_modified); #endif strftime(newheader, sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr); freez(*header); *header = strdup("Last-Modified: "); string_append(header, newheader); if (*header == NULL) { log_error(LOG_LEVEL_ERROR, "Insufficent 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)"); } } else { log_error(LOG_LEVEL_HEADER, "Randomized ... or not. No time difference to work with."); } } } return JB_ERR_OK; } /********************************************************************* * * Function : client_accept_encoding * * Description : Rewrite the client's Accept-Encoding header so that * if doesn't allow compression, if the action applies. * Note: For HTTP/1.0 the absence of the header is enough. * * 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. * *********************************************************************/ jb_err client_accept_encoding(struct client_state *csp, char **header) { if ((csp->action->flags & ACTION_NO_COMPRESSION) != 0) { log_error(LOG_LEVEL_HEADER, "Suppressed offer to compress content"); freez(*header); /* Temporarily disable the correct behaviour to * work around a PHP bug. * * if (!strcmpic(csp->http->ver, "HTTP/1.1")) * { * *header = strdup("Accept-Encoding: identity;q=1.0, *;q=0"); * if (*header == NULL) * { * return JB_ERR_MEMORY; * } * } * */ } return JB_ERR_OK; } /********************************************************************* * * Function : client_te * * Description : Rewrite the client's TE header so that * if doesn't allow compression, if the action applies. * * 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. * *********************************************************************/ jb_err client_te(struct client_state *csp, char **header) { if ((csp->action->flags & ACTION_NO_COMPRESSION) != 0) { freez(*header); log_error(LOG_LEVEL_HEADER, "Suppressed offer to compress transfer"); } return JB_ERR_OK; } /********************************************************************* * * Function : client_referrer * * Description : Handle the "referer" config setting properly. * Called from `sed'. * * 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. * *********************************************************************/ jb_err client_referrer(struct client_state *csp, char **header) { const char *newval; const char *host; char *referer; size_t hostlenght; #ifdef FEATURE_FORCE_LOAD /* Since the referrer can include the prefix even * if the request itself is non-forced, we must * clean it unconditionally */ strclean(*header, FORCE_PREFIX); #endif /* def FEATURE_FORCE_LOAD */ /* * Are we sending referer? */ if ((csp->action->flags & ACTION_HIDE_REFERER) == 0) { return JB_ERR_OK; } newval = csp->action->string[ACTION_STRING_REFERER]; if ((0 != strcmpic(newval, "conditional-block"))) { freez(*header); } if ((newval == NULL) || (0 == strcmpic(newval, "block")) ) { /* * Blocking referer */ log_error(LOG_LEVEL_HEADER, "Referer crunched!"); return JB_ERR_OK; } else if (0 == strcmpic(newval, "conditional-block")) { /* * 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; } else if (0 != strcmpic(newval, "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; } 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; } } /********************************************************************* * * Function : client_accept_language * * Description : Handle the "Accept-Language" config setting properly. * Called from `sed'. * * 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. * *********************************************************************/ jb_err client_accept_language(struct client_state *csp, char **header) { const char *newval; /* * Are we messing with the Accept-Language? */ if ((csp->action->flags & ACTION_HIDE_ACCEPT_LANGUAGE) == 0) { /*I don't think so*/ return JB_ERR_OK; } newval = csp->action->string[ACTION_STRING_LANGUAGE]; if ((newval == NULL) || (0 == strcmpic(newval, "block")) ) { /* * Blocking Accept-Language header */ log_error(LOG_LEVEL_HEADER, "Crunching Accept-Language!"); freez(*header); return JB_ERR_OK; } else { /* * Replacing Accept-Language header */ freez(*header); *header = strdup("Accept-Language: "); string_append(header, newval); if (*header == NULL) { log_error(LOG_LEVEL_ERROR, "Insufficent memory. Accept-Language header crunched without replacement."); } else { 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 * * Description : Crunch client header if it matches a string supplied by the * user. Called from `sed'. * * 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 * *********************************************************************/ jb_err crunch_client_header(struct client_state *csp, char **header) { const char *crunch_pattern; /*Is there a header to crunch*/ if ((csp->action->flags & ACTION_CRUNCH_CLIENT_HEADER)) { crunch_pattern = csp->action->string[ACTION_STRING_CLIENT_HEADER]; /*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); freez(*header); } } return JB_ERR_OK; } /********************************************************************* * * Function : client_uagent * * Description : Handle the "user-agent" config setting properly * and remember its original value to enable browser * bug workarounds. Called from `sed'. * * 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. * *********************************************************************/ jb_err client_uagent(struct client_state *csp, char **header) { const char *newval; if ((csp->action->flags & ACTION_HIDE_USER_AGENT) == 0) { return JB_ERR_OK; } newval = csp->action->string[ACTION_STRING_USER_AGENT]; if (newval == NULL) { return JB_ERR_OK; } freez(*header); *header = strdup("User-Agent: "); string_append(header, newval); log_error(LOG_LEVEL_HEADER, "Modified: %s", *header); return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK; } /********************************************************************* * * Function : client_ua * * Description : Handle "ua-" headers properly. Called from `sed'. * * 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. * *********************************************************************/ jb_err client_ua(struct client_state *csp, char **header) { if ((csp->action->flags & ACTION_HIDE_USER_AGENT) != 0) { log_error(LOG_LEVEL_HEADER, "crunched User-Agent!"); freez(*header); } return JB_ERR_OK; } /********************************************************************* * * Function : client_from * * Description : Handle the "from" config setting properly. * Called from `sed'. * * 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. * *********************************************************************/ jb_err client_from(struct client_state *csp, char **header) { const char *newval; if ((csp->action->flags & ACTION_HIDE_FROM) == 0) { return JB_ERR_OK; } freez(*header); newval = csp->action->string[ACTION_STRING_FROM]; /* * Are we blocking the e-mail address? */ if ((newval == NULL) || (0 == strcmpic(newval, "block")) ) { log_error(LOG_LEVEL_HEADER, "crunched From!"); return JB_ERR_OK; } log_error(LOG_LEVEL_HEADER, " modified"); *header = strdup("From: "); string_append(header, newval); return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK; } /********************************************************************* * * 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 ...... * * 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. * *********************************************************************/ 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 { log_error(LOG_LEVEL_HEADER, "Crunched outgoing cookie -- yum!"); } /* * Always remove the cookie here. The cookie header * will be sent at the end of the header. */ freez(*header); return result; } /********************************************************************* * * Function : client_x_forwarded * * Description : Handle the "x-forwarded-for" config setting properly, * also used in the add_client_headers list. Called from `sed'. * * 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. * *********************************************************************/ jb_err client_x_forwarded(struct client_state *csp, char **header) { if ((csp->action->flags & ACTION_HIDE_FORWARDED) == 0) { /* Save it so we can re-add it later */ freez(csp->x_forwarded); csp->x_forwarded = *header; /* * 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!"); } return JB_ERR_OK; } /********************************************************************* * * Function : client_max_forwards * * Description : If the HTTP method is OPTIONS or TRACE, subtract one * from the value of the Max-Forwards header field. * * 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. * *********************************************************************/ jb_err client_max_forwards(struct client_state *csp, char **header) { int max_forwards; if ((0 == strcmpic(csp->http->gpc, "trace")) || (0 == strcmpic(csp->http->gpc, "options"))) { assert(*(*header+12) == ':'); if (1 == sscanf(*header+12, ": %u", &max_forwards)) { if (max_forwards > 0) { snprintf(*header, strlen(*header)+1, "Max-Forwards: %u", --max_forwards); log_error(LOG_LEVEL_HEADER, "Max-Forwards value for %s request reduced to %u.", csp->http->gpc, max_forwards); } else if (max_forwards < 0) { log_error(LOG_LEVEL_ERROR, "Crunching invalid header: %s", *header); freez(*header); } else { /* * Not supposed to be reached. direct_response() which * was already called earlier in chat() should have * intercepted the request. */ log_error(LOG_LEVEL_ERROR, "Non-intercepted %s request with Max-Forwards zero!", csp->http->gpc); assert(max_forwards != 0); } } else { log_error(LOG_LEVEL_ERROR, "Crunching invalid header: %s", *header); freez(*header); } } return JB_ERR_OK; } /********************************************************************* * * Function : client_host * * Description : If the request URI did not contain host and * port information, parse and evaluate the Host * header field. * * Also, kill ill-formed HOST: headers as sent by * Apple's iTunes software when used with a proxy. * * 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. * *********************************************************************/ jb_err client_host(struct client_state *csp, char **header) { char *p, *q; /* * If the header field name is all upper-case, chances are that it's * an ill-formed one from iTunes. BTW, killing innocent headers here is * not a problem -- they are regenerated later. */ if ((*header)[1] == 'O') { log_error(LOG_LEVEL_HEADER, "Killed all-caps Host header line: %s", *header); freez(*header); return JB_ERR_OK; } if (!csp->http->hostport || (*csp->http->hostport == '*') || *csp->http->hostport == ' ' || *csp->http->hostport == '\0') { if (NULL == (p = strdup((*header)+6))) { return JB_ERR_MEMORY; } chomp(p); if (NULL == (q = strdup(p))) { freez(p); return JB_ERR_MEMORY; } freez(csp->http->hostport); csp->http->hostport = p; freez(csp->http->host); csp->http->host = q; q = strchr(csp->http->host, ':'); if (q != NULL) { /* Terminate hostname and evaluate port string */ *q++ = '\0'; csp->http->port = atoi(q); } else { csp->http->port = csp->http->ssl ? 443 : 80; } log_error(LOG_LEVEL_HEADER, "New host and port from Host field: %s = %s:%d", csp->http->hostport, csp->http->host, csp->http->port); } return JB_ERR_OK; } /********************************************************************* * * Function : client_if_modified_since * * Description : Remove or modify the If-Modified-Since header. * * 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. * *********************************************************************/ jb_err client_if_modified_since(struct client_state *csp, char **header) { char newheader[50]; #ifdef HAVE_GMTIME_R struct tm gmt; #endif 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")) { /* * The client got an error message because of a temporary problem, * the problem is gone and the client now tries to revalidate our * error message on the real server. The revalidation would always * end with the transmission of the whole document and there is * no need to expose the bogus If-Modified-Since header. */ log_error(LOG_LEVEL_HEADER, "Crunching useless If-Modified-Since header."); freez(*header); } else if (csp->action->flags & ACTION_HIDE_IF_MODIFIED_SINCE) { newval = csp->action->string[ACTION_STRING_IF_MODIFIED_SINCE]; if ((0 == strcmpic(newval, "block"))) { log_error(LOG_LEVEL_HEADER, "Crunching %s", *header); freez(*header); } else /* add random value */ { if ((timeptr = parse_header_time(*header, &tm)) == NULL) { log_error(LOG_LEVEL_HEADER, "Couldn't parse: %s (crunching!)", *header); freez(*header); } else { rtime = strtol(newval, &endptr, 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) { rtime *= -1; negative = 1; } rtime *= 60; rtime = pick_from_range(rtime); } else { log_error(LOG_LEVEL_ERROR, "Random range is 0. Assuming time transformation test.", *header); } tm += rtime * (negative ? -1 : 1); #ifdef HAVE_GMTIME_R timeptr = gmtime_r(&tm, &gmt); #elif FEATURE_PTHREAD pthread_mutex_lock(&gmtime_mutex); timeptr = gmtime(&tm); pthread_mutex_unlock(&gmtime_mutex); #else timeptr = gmtime(&tm); #endif strftime(newheader, sizeof(newheader), "%a, %d %b %Y %H:%M:%S GMT", timeptr); freez(*header); *header = strdup("If-Modified-Since: "); string_append(header, newheader); if (*header == NULL) { log_error(LOG_LEVEL_HEADER, "Insufficent 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; 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)"); } } } } return JB_ERR_OK; } /********************************************************************* * * Function : client_if_none_match * * Description : Remove the If-None-Match header. * * 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. * *********************************************************************/ jb_err client_if_none_match(struct client_state *csp, char **header) { if (csp->action->flags & ACTION_CRUNCH_IF_NONE_MATCH) { log_error(LOG_LEVEL_HEADER, "Crunching %s", *header); freez(*header); } return JB_ERR_OK; } /********************************************************************* * * Function : client_x_filter * * Description : Disables filtering if the client set "X-Filter: No". * Called from `sed'. * * 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 * *********************************************************************/ jb_err client_x_filter(struct client_state *csp, char **header) { if ( 0 == strcmpic(*header, "X-Filter: No")) { if (!(csp->config->feature_flags & RUNTIME_FEATURE_HTTP_TOGGLE)) { log_error(LOG_LEVEL_INFO, "Ignored the client's request to fetch without filtering."); } else { 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!"); } else { csp->content_type = CT_TABOO; csp->action->flags &= ~ACTION_FILTER_SERVER_HEADERS; csp->action->flags &= ~ACTION_FILTER_CLIENT_HEADERS; log_error(LOG_LEVEL_HEADER, "Accepted the client's request to fetch without filtering."); } log_error(LOG_LEVEL_HEADER, "Crunching %s", *header); freez(*header); } } return JB_ERR_OK; } /* the following functions add headers directly to the header list */ /********************************************************************* * * Function : client_host_adder * * Description : Adds the Host: header field if it is missing. * 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_host_adder(struct client_state *csp) { char *p; jb_err err; if ( !csp->http->hostport || !*(csp->http->hostport)) { return JB_ERR_OK; } /* * remove 'user:pass@' from 'proto://user:pass@host' */ if ( (p = strchr( csp->http->hostport, '@')) != NULL ) { p++; } else { p = csp->http->hostport; } 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; } /********************************************************************* * * Function : client_accept_encoding_adder * * Description : Add an Accept-Encoding header to the client's request * that disables compression if the action applies, and * the header is not already there. Called from `sed'. * Note: For HTTP/1.0, the absence of the header is enough. * * 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_accept_encoding_adder(struct client_state *csp) { if ( ((csp->action->flags & ACTION_NO_COMPRESSION) != 0) && (!strcmpic(csp->http->ver, "HTTP/1.1")) ) { return enlist_unique(csp->headers, "Accept-Encoding: identity;q=1.0, *;q=0", 16); } return JB_ERR_OK; } /********************************************************************* * * Function : client_xtra_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_xtra_adder(struct client_state *csp) { struct list_entry *lst; jb_err err; for (lst = csp->action->multi[ACTION_MULTI_ADD_HEADER]->first; lst ; lst = lst->next) { log_error(LOG_LEVEL_HEADER, "addh: %s", lst->str); err = enlist(csp->headers, lst->str); if (err) { return err; } } return JB_ERR_OK; } /********************************************************************* * * Function : client_x_forwarded_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_x_forwarded_adder(struct client_state *csp) { char *p = NULL; jb_err err; if ((csp->action->flags & ACTION_HIDE_FORWARDED) != 0) { return JB_ERR_OK; } if (csp->x_forwarded) { p = strdup(csp->x_forwarded); string_append(&p, ", "); } else { p = strdup("X-Forwarded-For: "); } string_append(&p, csp->ip_addr_str); if (p == NULL) { return JB_ERR_MEMORY; } log_error(LOG_LEVEL_HEADER, "addh: %s", p); err = enlist(csp->headers, p); free(p); return err; } /********************************************************************* * * Function : connection_close_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! * * 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 connection_close_adder(struct client_state *csp) { log_error(LOG_LEVEL_HEADER, "Adding: Connection: close"); return enlist(csp->headers, "Connection: close"); } /********************************************************************* * * Function : server_http * * Description : - Save the HTTP Status into csp->http->status * - Set CT_TABOO to prevent filtering if the answer * is a partial range (HTTP status 206) * - Rewrite HTTP/1.1 answers to HTTP/1.0 if +downgrade * action applies. * * 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. * *********************************************************************/ jb_err server_http(struct client_state *csp, char **header) { sscanf(*header, "HTTP/%*d.%*d %d", &(csp->http->status)); if (csp->http->status == 206) { csp->content_type = CT_TABOO; } if ((csp->action->flags & ACTION_DOWNGRADE) != 0) { (*header)[7] = '0'; log_error(LOG_LEVEL_HEADER, "Downgraded answer to HTTP/1.0"); } return JB_ERR_OK; } /********************************************************************* * * Function : server_set_cookie * * Description : Handle the server "cookie" header properly. * 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...) * 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. * *********************************************************************/ jb_err server_set_cookie(struct client_state *csp, char **header) { time_t now; time_t cookie_time; struct tm tm_now; struct tm tm_cookie; time(&now); #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 ]; #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); /* strlen("set-cookie: ") = 12 */ fprintf(csp->config->jar, "%s %s\t%s\n", tempbuf, csp->http->host, *header + 12); } #endif /* def FEATURE_COOKIE_JAR */ if ((csp->action->flags & ACTION_NO_COOKIE_SET) != 0) { log_error(LOG_LEVEL_HEADER, "Crunched incoming cookie -- yum!"); return crumble(csp, header); } else if ((csp->action->flags & ACTION_NO_COOKIE_KEEP) != 0) { /* Flag whether or not to log a message */ int changed = 0; /* A variable to store the tag we're working on */ char *cur_tag; /* Skip "Set-Cookie:" (11 characters) in header */ cur_tag = *header + 11; /* skip whitespace between "Set-Cookie:" and value */ while (*cur_tag && ijb_isspace(*cur_tag)) { cur_tag++; } /* Loop through each tag in the cookie */ while (*cur_tag) { /* Find next tag */ char *next_tag = strchr(cur_tag, ';'); if (next_tag != NULL) { /* Skip the ';' character itself */ next_tag++; /* skip whitespace ";" and start of tag */ while (*next_tag && ijb_isspace(*next_tag)) { next_tag++; } } else { /* "Next tag" is the end of the string */ next_tag = cur_tag + strlen(cur_tag); } /* * 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)) { char *match; const char *expiration_date = cur_tag + 8; /* Skip "[Ee]xpires=" */ /* * Try the valid time formats we know about. * * XXX: This should be factored out into a separate function. * * XXX: Maybe the log messages should be removed * for the next stable release. They just exist to * see which time format gets the most hits and * should be checked for first. */ if (NULL != (match = strptime(expiration_date, "%a, %e-%b-%y %H:%M:%S ", &tm_cookie))) { /* 22-Feb-2008 12:01:18 GMT */ log_error(LOG_LEVEL_HEADER, "cookie \'%s\' send by %s appears to be using time format 1.", *header, csp->http->url); } else if (NULL != (match = strptime(expiration_date, "%A, %e-%b-%Y %H:%M:%S ", &tm_cookie))) { /* Tue, 02-Jun-2037 20:00:00 GMT */ log_error(LOG_LEVEL_HEADER, "cookie \'%s\' send by %s appears to be using time format 2.", *header, csp->http->url); } else if (NULL != (match = strptime(expiration_date, "%a, %e-%b-%Y %H:%M:%S ", &tm_cookie))) { /* Tuesday, 02-Jun-2037 20:00:00 GMT */ /* * On FreeBSD this is never reached because it's handled * by "format 2" as well. I am, however, not sure if all * strptime() implementations behave that way. */ log_error(LOG_LEVEL_HEADER, "cookie \'%s\' send by %s appears to be using time format 3.", *header, csp->http->url); } else if (NULL != (match = strptime(expiration_date, "%a, %e %b %Y %H:%M:%S ", &tm_cookie))) { /* Fri, 22 Feb 2008 19:20:05 GMT */ log_error(LOG_LEVEL_HEADER, "cookie \'%s\' send by %s appears to be using time format 4.", *header, csp->http->url); } /* Did any of them match? */ if (NULL == match) { /* * 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); memmove(cur_tag, next_tag, strlen(next_tag) + 1); 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. */ cookie_time = timegm(&tm_cookie); 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 { log_error(LOG_LEVEL_HEADER, "Cookie \'%s\' is still valid and has to be rewritten.", *header); /* * 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); /* 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. */ } } } else { /* Move on to next cookie tag */ cur_tag = next_tag; } } if (changed) { assert(NULL != *header); log_error(LOG_LEVEL_HEADER, "Cookie rewritten to a temporary one: %s", *header); } } return JB_ERR_OK; } #ifdef FEATURE_FORCE_LOAD /********************************************************************* * * Function : strclean * * Description : In-Situ-Eliminate all occurances of substring in * string * * Parameters : * 1 : string = string to clean * 2 : substring = substring to eliminate * * Returns : Number of eliminations * *********************************************************************/ int strclean(const char *string, const char *substring) { int hits = 0; size_t len; char *pos, *p; len = strlen(substring); while((pos = strstr(string, substring)) != NULL) { p = pos + len; do { *(p - len) = *p; } while (*p++ != '\0'); hits++; } return(hits); } #endif /* def FEATURE_FORCE_LOAD */ /********************************************************************* * * Function : parse_header_time * * Description : Transforms time inside a HTTP header into * the usual time format. * * Parameters : * 1 : header = header to parse * 2 : tm = storage for the resulting time in seconds * * Returns : Time struct containing the header time, or * NULL in case of a parsing problems. * *********************************************************************/ struct tm *parse_header_time(char *header, time_t *tm) { char * timestring; struct tm gmt; struct tm * timeptr; /* * Initializing 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 { *tm = timegm(&gmt); timeptr = &gmt; } return(timeptr); } /********************************************************************* * * Function : get_destination_from_headers * * Description : Parse the "Host:" header to get the request's destination. * Only needed if the client's request was forcefully * redirected into Privoxy. * * Code mainly copied from client_host() which is currently * run too late for this purpose. * * Parameters : * 1 : headers = List of headers (one of them hopefully being * the "Host:" header) * 2 : http = storage for the result (host, port and hostport). * * Returns : JB_ERR_MEMORY in case of memory problems, * JB_ERR_PARSE if the host header couldn't be found, * JB_ERR_OK otherwise. * *********************************************************************/ jb_err get_destination_from_headers(const struct list *headers, struct http_request *http) { char *q; char *p; char *host; host = get_header_value(headers, "Host:"); if (NULL == host) { log_error(LOG_LEVEL_ERROR, "No \"Host:\" header found."); return JB_ERR_PARSE; } if (NULL == (p = strdup((host)))) { log_error(LOG_LEVEL_ERROR, "Out of memory while parsing \"Host:\" header"); return JB_ERR_MEMORY; } chomp(p); if (NULL == (q = strdup(p))) { freez(p); log_error(LOG_LEVEL_ERROR, "Out of memory while parsing \"Host:\" header"); return JB_ERR_MEMORY; } freez(http->hostport); http->hostport = p; freez(http->host); http->host = q; q = strchr(http->host, ':'); if (q != NULL) { /* Terminate hostname and evaluate port string */ *q++ = '\0'; http->port = atoi(q); } else { http->port = http->ssl ? 443 : 80; } /* Rebuild request URL */ freez(http->url); http->url = strdup(http->ssl ? "https://" : "http://"); string_append(&http->url, http->hostport); string_append(&http->url, http->path); if (http->url == NULL) { return JB_ERR_MEMORY; } log_error(LOG_LEVEL_HEADER, "Destination extracted from \"Host:\" header. New request URL: %s", http->url); return JB_ERR_OK; } /* Local Variables: tab-width: 3 end: */