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parsers.c
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const char parsers_rcs[] = "$Id: parsers.c,v 1.56.2.8 2003/07/11 13:21:25 oes Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/Attic/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',
* and `server_set_cookie'.
*
* Copyright : Written by and Copyright (C) 2001 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 1.56.2.8 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 <stdio.h>
#include <sys/types.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <string.h>
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif
#ifdef OSX_DARWIN
#include <pthread.h>
#include "jcc.h"
/* jcc.h is for mutex semapores only */
#endif /* def OSX_DARWIN */
#include "project.h"
#include "list.h"
#include "parsers.h"
#include "encode.h"
#include "ssplit.h"
#include "errlog.h"
#include "jbsockets.h"
#include "miscutil.h"
#include "list.h"
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, crumble }, */
{ "Keep-Alive:", 11, crumble },
{ "connection:", 11, crumble },
{ "proxy-connection:", 17, crumble },
{ "max-forwards:", 13, client_max_forwards },
{ 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-Length:", 15, server_content_length },
{ "Content-MD5:", 12, server_content_md5 },
{ "Content-Encoding:", 17, server_content_encoding },
{ "Transfer-Encoding:", 18, server_transfer_coding },
{ "Keep-Alive:", 11, crumble },
{ 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 = iob->eod - iob->buf;
offset = iob->cur - iob->buf;
need = used + 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;
}
/*********************************************************************
*
* 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;
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);
if (strncmpic(p->str, v->str, v->len) == 0)
{
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);
}
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 : 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, "crunch!");
freez(*header);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : server_content_type
*
* Description : Set the content-type for filterable types (text/.*,
* javascript and image/gif) unless filtering has been
* 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)
{
if (csp->content_type != CT_TABOO)
{
if ((strstr(*header, " text/") && !strstr(*header, "plain"))
|| strstr(*header, "application/x-javascript"))
csp->content_type = CT_TEXT;
else if (strstr(*header, " image/gif"))
csp->content_type = CT_GIF;
else
csp->content_type = 0;
}
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"
* - Change from "chunked" to "identity" 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"))
{
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, so adjust the header:
*/
if (csp->flags & CSP_FLAG_MODIFIED)
{
freez(*header);
*header = strdup("Transfer-Encoding: identity");
return (header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : server_content_encoding
*
* Description : Prohibit filtering (CT_TABOO) if content encoding compresses
*
* 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)
{
/*
* Turn off pcrs and gif filtering if body compressed
*/
if (strstr(*header, "gzip") || strstr(*header, "compress") || strstr(*header, "deflate"))
{
csp->content_type = CT_TABOO;
}
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)
{
if (csp->content_length != 0) /* Content length has been modified */
{
freez(*header);
*header = (char *) zalloc(100);
if (*header == NULL)
{
return JB_ERR_MEMORY;
}
sprintf(*header, "Content-Length: %d", (int) csp->content_length);
log_error(LOG_LEVEL_HEADER, "Adjust 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.