-const char parsers_rcs[] = "$Id: parsers.c,v 1.45 2002/01/09 14:33:03 oes Exp $";
+const char parsers_rcs[] = "$Id: parsers.c,v 1.78 2006/12/26 17:19:20 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/parsers.c,v $
* `client_uagent', `client_x_forwarded',
* `client_x_forwarded_adder', `client_xtra_adder',
* `content_type', `crumble', `destroy_list', `enlist',
- * `flush_socket', ``get_header', `sed',
- * and `server_set_cookie'.
+ * `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 the SourceForge
- * IJBSWA team. http://ijbswa.sourceforge.net
+ * Copyright : Written by and Copyright (C) 2001-2006 the SourceForge
+ * Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
*
* Revisions :
* $Log: parsers.c,v $
+ * Revision 1.78 2006/12/26 17:19:20 fabiankeil
+ * Bringing back the "useless" localtime() call
+ * I removed in revision 1.67. On some platforms
+ * it's necessary to prevent time zone offsets.
+ *
+ * Revision 1.77 2006/12/07 18:44:26 fabiankeil
+ * Rebuild request URL in get_destination_from_headers()
+ * to make sure redirect{pcrs command} works as expected
+ * for intercepted requests.
+ *
+ * Revision 1.76 2006/12/06 19:52:25 fabiankeil
+ * Added get_destination_from_headers().
+ *
+ * Revision 1.75 2006/11/13 19:05:51 fabiankeil
+ * Make pthread mutex locking more generic. Instead of
+ * checking for OSX and OpenBSD, check for FEATURE_PTHREAD
+ * and use mutex locking unless there is an _r function
+ * available. Better safe than sorry.
+ *
+ * Fixes "./configure --disable-pthread" and should result
+ * in less threading-related problems on pthread-using platforms,
+ * but it still doesn't fix BR#1122404.
+ *
+ * Revision 1.74 2006/10/02 16:59:12 fabiankeil
+ * The special header "X-Filter: No" now disables
+ * header filtering as well.
+ *
+ * Revision 1.73 2006/09/23 13:26:38 roro
+ * Replace TABs by spaces in source code.
+ *
+ * Revision 1.72 2006/09/23 12:37:21 fabiankeil
+ * Don't print a log message every time filter_headers is
+ * entered or left. It only creates noise without any real
+ * information.
+ *
+ * Revision 1.71 2006/09/21 19:55:17 fabiankeil
+ * Fix +hide-if-modified-since{-n}.
+ *
+ * Revision 1.70 2006/09/08 12:06:34 fabiankeil
+ * Have hide-if-modified-since interpret the random
+ * range value as minutes instead of hours. Allows
+ * more fine-grained configuration.
+ *
+ * Revision 1.69 2006/09/06 16:25:51 fabiankeil
+ * Always have parse_header_time return a pointer
+ * that actual makes sense, even though we currently
+ * only need it to detect problems.
+ *
+ * Revision 1.68 2006/09/06 10:43:32 fabiankeil
+ * Added config option enable-remote-http-toggle
+ * to specify if Privoxy should recognize special
+ * headers (currently only X-Filter) to change its
+ * behaviour. Disabled by default.
+ *
+ * Revision 1.67 2006/09/04 11:01:26 fabiankeil
+ * After filtering de-chunked instances, remove
+ * "Transfer-Encoding" header entirely instead of changing
+ * it to "Transfer-Encoding: identity", which is invalid.
+ * Thanks Michael Shields <shields@msrl.com>. Fixes PR 1318658.
+ *
+ * Don't use localtime in parse_header_time. An empty time struct
+ * is good enough, it gets overwritten by strptime anyway.
+ *
+ * Revision 1.66 2006/09/03 19:38:28 fabiankeil
+ * Use gmtime_r if available, fallback to gmtime with mutex
+ * protection for MacOSX and use vanilla gmtime for the rest.
+ *
+ * Revision 1.65 2006/08/22 10:55:56 fabiankeil
+ * Changed client_referrer to use the right type (size_t) for
+ * hostlenght and to shorten the temporary referrer string with
+ * '\0' instead of adding a useless line break.
+ *
+ * Revision 1.64 2006/08/17 17:15:10 fabiankeil
+ * - Back to timegm() using GnuPG's replacement if necessary.
+ * Using mktime() and localtime() could add a on hour offset if
+ * the randomize factor was big enough to lead to a summer/wintertime
+ * switch.
+ *
+ * - Removed now-useless Privoxy 3.0.3 compatibility glue.
+ *
+ * - Moved randomization code into pick_from_range().
+ *
+ * - Changed parse_header_time definition.
+ * time_t isn't guaranteed to be signed and
+ * if it isn't, -1 isn't available as error code.
+ * Changed some variable types in client_if_modified_since()
+ * because of the same reason.
+ *
+ * Revision 1.63 2006/08/14 13:18:08 david__schmidt
+ * OS/2 compilation compatibility fixups
+ *
+ * Revision 1.62 2006/08/14 08:58:42 fabiankeil
+ * Changed include from strptime.c to strptime.h
+ *
+ * Revision 1.61 2006/08/14 08:25:19 fabiankeil
+ * Split filter-headers{} into filter-client-headers{}
+ * and filter-server-headers{}.
+ * Added parse_header_time() to share some code.
+ * Replaced timegm() with mktime().
+ *
+ * Revision 1.60 2006/08/12 03:54:37 david__schmidt
+ * Windows service integration
+ *
+ * Revision 1.59 2006/08/03 02:46:41 david__schmidt
+ * Incorporate Fabian Keil's patch work:\rhttp://www.fabiankeil.de/sourcecode/privoxy/
+ *
+ * Revision 1.58 2006/07/18 14:48:47 david__schmidt
+ * Reorganizing the repository: swapping out what was HEAD (the old 3.1 branch)
+ * with what was really the latest development (the v_3_0_branch branch)
+ *
+ * Revision 1.56.2.10 2006/01/21 16:16:08 david__schmidt
+ * Thanks to Edward Carrel for his patch to modernize OSX's\rpthreads support. See bug #1409623.
+ *
+ * Revision 1.56.2.9 2004/10/03 12:53:45 david__schmidt
+ * Add the ability to check jpeg images for invalid
+ * lengths of comment blocks. Defensive strategy
+ * against the exploit:
+ * Microsoft Security Bulletin MS04-028
+ * Buffer Overrun in JPEG Processing (GDI+) Could
+ * Allow Code Execution (833987)
+ * Enabled with +inspect-jpegs in actions files.
+ *
+ * Revision 1.56.2.8 2003/07/11 13:21:25 oes
+ * Excluded text/plain objects from filtering. This fixes a
+ * couple of client-crashing, download corruption and
+ * Privoxy performance issues, whose root cause lies in
+ * web servers labelling content of unknown type as text/plain.
+ *
+ * Revision 1.56.2.7 2003/05/06 12:07:26 oes
+ * Fixed bug #729900: Suspicious HOST: headers are now killed and regenerated if necessary
+ *
+ * Revision 1.56.2.6 2003/04/14 21:28:30 oes
+ * Completing the previous change
+ *
+ * Revision 1.56.2.5 2003/04/14 12:08:16 oes
+ * Added temporary workaround for bug in PHP < 4.2.3
+ *
+ * Revision 1.56.2.4 2003/03/07 03:41:05 david__schmidt
+ * Wrapping all *_r functions (the non-_r versions of them) with mutex semaphores for OSX. Hopefully this will take care of all of those pesky crash reports.
+ *
+ * Revision 1.56.2.3 2002/11/10 04:20:02 hal9
+ * Fix typo: supressed -> suppressed
+ *
+ * Revision 1.56.2.2 2002/09/25 14:59:53 oes
+ * Improved cookie logging
+ *
+ * Revision 1.56.2.1 2002/09/25 14:52:45 oes
+ * Added basic support for OPTIONS and TRACE HTTP methods:
+ * - New parser function client_max_forwards which decrements
+ * the Max-Forwards HTTP header field of OPTIONS and TRACE
+ * requests by one before forwarding
+ * - New parser function client_host which extracts the host
+ * and port information from the HTTP header field if the
+ * request URI was not absolute
+ * - Don't crumble and re-add the Host: header, but only generate
+ * and append if missing
+ *
+ * Revision 1.56 2002/05/12 15:34:22 jongfoster
+ * Fixing typo in a comment
+ *
+ * Revision 1.55 2002/05/08 16:01:07 oes
+ * Optimized add_to_iob:
+ * - Use realloc instead of malloc(), memcpy(), free()
+ * - Expand to powers of two if possible, to get
+ * O(log n) reallocs instead of O(n).
+ * - Moved check for buffer limit here from chat
+ * - Report failure via returncode
+ *
+ * Revision 1.54 2002/04/02 15:03:16 oes
+ * Tiny code cosmetics
+ *
+ * Revision 1.53 2002/03/26 22:29:55 swa
+ * we have a new homepage!
+ *
+ * Revision 1.52 2002/03/24 13:25:43 swa
+ * name change related issues
+ *
+ * Revision 1.51 2002/03/13 00:27:05 jongfoster
+ * Killing warnings
+ *
+ * Revision 1.50 2002/03/12 01:45:35 oes
+ * More verbose logging
+ *
+ * Revision 1.49 2002/03/09 20:03:52 jongfoster
+ * - Making various functions return int rather than size_t.
+ * (Undoing a recent change). Since size_t is unsigned on
+ * Windows, functions like read_socket that return -1 on
+ * error cannot return a size_t.
+ *
+ * THIS WAS A MAJOR BUG - it caused frequent, unpredictable
+ * crashes, and also frequently caused JB to jump to 100%
+ * CPU and stay there. (Because it thought it had just
+ * read ((unsigned)-1) == 4Gb of data...)
+ *
+ * - The signature of write_socket has changed, it now simply
+ * returns success=0/failure=nonzero.
+ *
+ * - Trying to get rid of a few warnings --with-debug on
+ * Windows, I've introduced a new type "jb_socket". This is
+ * used for the socket file descriptors. On Windows, this
+ * is SOCKET (a typedef for unsigned). Everywhere else, it's
+ * an int. The error value can't be -1 any more, so it's
+ * now JB_INVALID_SOCKET (which is -1 on UNIX, and in
+ * Windows it maps to the #define INVALID_SOCKET.)
+ *
+ * - The signature of bind_port has changed.
+ *
+ * Revision 1.48 2002/03/07 03:46:53 oes
+ * Fixed compiler warnings etc
+ *
+ * Revision 1.47 2002/02/20 23:15:13 jongfoster
+ * Parsing functions now handle out-of-memory gracefully by returning
+ * an error code.
+ *
+ * Revision 1.46 2002/01/17 21:03:47 jongfoster
+ * Moving all our URL and URL pattern parsing code to urlmatch.c.
+ *
* Revision 1.45 2002/01/09 14:33:03 oes
* Added support for localtime_r.
*
#include <ctype.h>
#include <assert.h>
#include <string.h>
+#include <time.h>
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#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 "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
const struct parsers client_patterns[] = {
- { "referer:", 8, client_referrer },
+ { "referer:", 8, client_referrer },
{ "user-agent:", 11, client_uagent },
- { "ua-", 3, client_ua },
- { "from:", 5, client_from },
- { "cookie:", 7, client_send_cookie },
+ { "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, crumble },
-/* { "if-modified-since:", 18, crumble }, */
+ { "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 },
- { NULL, 0, NULL }
+ { "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-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 },
+ { "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 },
+ { "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 },
+ { NULL, 0, NULL }
+};
-void (* const add_client_headers[])(struct client_state *) = {
+const add_header_func_ptr add_client_headers[] = {
client_host_adder,
client_cookie_adder,
client_x_forwarded_adder,
client_xtra_adder,
- client_accept_encoding_adder,
+ /* Temporarily disabled: client_accept_encoding_adder, */
connection_close_adder,
NULL
};
-void (* const add_server_headers[])(struct client_state *) = {
+const add_header_func_ptr add_server_headers[] = {
connection_close_adder,
NULL
};
-
/*********************************************************************
*
* Function : flush_socket
* file, the results are not portable.
*
*********************************************************************/
-int flush_socket(int fd, struct client_state *csp)
+int flush_socket(jb_socket fd, struct client_state *csp)
{
struct iob *iob = csp->iob;
- int n = iob->eod - iob->cur;
+ int len = iob->eod - iob->cur;
- if (n <= 0)
+ if (len <= 0)
{
return(0);
}
- n = write_socket(fd, iob->cur, n);
+ if (write_socket(fd, iob->cur, (size_t)len))
+ {
+ return(-1);
+ }
iob->eod = iob->cur = iob->buf;
- return(n);
+ return(len);
}
*
* Function : add_to_iob
*
- * Description : Add content to the buffered page.
+ * 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 : Number of bytes in the content buffer.
+ * Returns : JB_ERR_OK on success, JB_ERR_MEMORY if out-of-memory
+ * or buffer limit reached.
*
*********************************************************************/
-int add_to_iob(struct client_state *csp, char *buf, int n)
+jb_err add_to_iob(struct client_state *csp, char *buf, size_t n)
{
struct iob *iob = csp->iob;
- int have, need;
+ size_t used, offset, need, want;
char *p;
- have = iob->eod - iob->cur;
-
- if (n <= 0)
- {
- return(have);
- }
+ if (n <= 0) return JB_ERR_OK;
- need = have + n;
+ used = (size_t)(iob->eod - iob->buf);
+ offset = (size_t)(iob->cur - iob->buf);
+ need = used + n + 1;
- if ((p = (char *)malloc(need + 1)) == NULL)
+ /*
+ * 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, "malloc() iob failed: %E");
- return(-1);
+ log_error(LOG_LEVEL_ERROR, "Buffer limit reached while extending the buffer (iob)");
+ return JB_ERR_MEMORY;
}
- if (have)
+ if (need > iob->size)
{
- /* there is something in the buffer - save it */
- memcpy(p, iob->cur, have);
-
- /* replace the buffer with the new space */
- freez(iob->buf);
- iob->buf = p;
+ 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;
+ }
- /* point to the end of the data */
- p += have;
- }
- else
- {
- /* the buffer is empty, free it and reinitialize */
- freez(iob->buf);
+ /* Update the iob pointers */
+ iob->cur = p + offset;
+ iob->eod = p + used;
iob->buf = p;
}
/* copy the new data into the iob buffer */
- memcpy(p, buf, n);
+ memcpy(iob->eod, buf, (size_t)n);
/* point to the end of the data */
- p += n;
+ iob->eod += n;
/* null terminate == cheap insurance */
- *p = '\0';
+ *iob->eod = '\0';
- /* set the pointers to the new values */
- iob->cur = iob->buf;
- iob->eod = p;
-
- return(need);
+ return JB_ERR_OK;
}
*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'))) *q = '\0';
+ if ((q = strchr(ret, '\r')) != NULL) *q = '\0';
- /* is this a blank linke (i.e. the end of the header) ? */
+ /* is this a blank line (i.e. the end of the header) ? */
if (*ret == '\0')
{
freez(ret);
* on out-of-memory error.
*
*********************************************************************/
-char *sed(const struct parsers pats[], void (* const more_headers[])(struct client_state *), struct client_state *csp)
+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;
- char *hdr;
- void (* const *f)();
+ 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;
- for (v = pats; v->str ; v++)
+ if (first_run) /* Parse and print */
{
- for (p = csp->headers->first; p ; p = p->next)
+ for (v = pats; (err == JB_ERR_OK) && (v->str != NULL) ; v++)
{
- /* Header crunch()ed in previous run? -> ignore */
- if (p->str == NULL) continue;
+ 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 (v == pats) log_error(LOG_LEVEL_HEADER, "scan: %s", p->str);
- if (strncmpic(p->str, v->str, v->len) == 0)
+ /* 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++)
{
- hdr = v->parser(v, p->str, csp);
- freez(p->str); /* FIXME: Yuck! patching a list...*/
- p->str = hdr;
+ 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));
+ }
+ }
}
}
}
- /* place any additional headers on the csp->headers list */
- for (f = more_headers; *f ; f++)
+ if (err != JB_ERR_OK)
{
- (*f)(csp);
+ return NULL;
}
- hdr = list_to_text(csp->headers);
+ return list_to_text(csp->headers);
+}
+
- return hdr;
+/* 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;
-/* here begins the family of parser functions that reformat header lines */
+ 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))
+ break;
+ /*
+ * 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;
+ }
+ }
+ }
+ }
+
+ if ( 0 == size )
+ {
+ log_error(LOG_LEVEL_HEADER, "Removing empty header %s", *header);
+ freez(*header);
+ }
+
+ return(JB_ERR_OK);
+}
/*********************************************************************
* Description : This is called if a header matches a pattern to "crunch"
*
* Parameters :
- * 1 : v = Pointer to parsers structure, which basically holds
- * headers (client or server) that we want to "crunch"
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : Always NULL.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *crumble(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err crumble(struct client_state *csp, char **header)
{
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
-
+ 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/.*,
* 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 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A duplicate string pointer to this header (ie. pass thru)
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_content_type(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_content_type(struct client_state *csp, char **header)
{
+ const char *newval;
+
+ newval = csp->action->string[ACTION_STRING_CONTENT_TYPE];
+
if (csp->content_type != CT_TABOO)
{
- if (strstr(s, " text/") || strstr(s, "application/x-javascript"))
+ if ((strstr(*header, " text/") && !strstr(*header, "plain"))
+ || strstr(*header, "xml")
+ || strstr(*header, "application/x-javascript"))
csp->content_type = CT_TEXT;
- else if (strstr(s, " image/gif"))
+ 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;
}
-
- return(strdup(s));
-
+ /*
+ * 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, newval);
+
+ if (header == NULL)
+ {
+ log_error(LOG_LEVEL_HEADER, "Insufficient memory. Conten-Type crunched without replacement!");
+ return JB_ERR_MEMORY;
+ }
+ log_error(LOG_LEVEL_HEADER, "Modified: %s!", *header);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_HEADER, "%s not replaced. It doesn't look like text. "
+ "Enable force-text-mode if you know what you're doing.", *header);
+ }
+ }
+ return JB_ERR_OK;
}
*
* 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.
+ * - Remove header if body was chunked but has been
+ * de-chunked for filtering.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A duplicate string pointer to this header (ie. pass thru)
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_transfer_coding(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_transfer_coding(struct client_state *csp, char **header)
{
/*
* Turn off pcrs and gif filtering if body compressed
*/
- if (strstr(s, "gzip") || strstr(s, "compress") || strstr(s, "deflate"))
+ if (strstr(*header, "gzip") || strstr(*header, "compress") || strstr(*header, "deflate"))
{
csp->content_type = CT_TABOO;
}
/*
* Raise flag if body chunked
*/
- if (strstr(s, "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 the body was modified, it has been de-chunked first
+ * and the header must be removed.
*/
if (csp->flags & CSP_FLAG_MODIFIED)
{
- return(strdup("Transfer-Encoding: identity"));
+ log_error(LOG_LEVEL_HEADER, "Removing: %s", *header);
+ freez(*header);
}
}
- return(strdup(s));
-
+ return JB_ERR_OK;
}
* Description : Prohibit filtering (CT_TABOO) if content encoding compresses
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A duplicate string pointer to this header (ie. pass thru)
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_content_encoding(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_content_encoding(struct client_state *csp, char **header)
{
/*
* Turn off pcrs and gif filtering if body compressed
*/
- if (strstr(s, "gzip") || strstr(s, "compress") || strstr(s, "deflate"))
+ if (strstr(*header, "gzip") || strstr(*header, "compress") || strstr(*header, "deflate"))
{
csp->content_type = CT_TABOO;
}
- return(strdup(s));
+ return JB_ERR_OK;
}
* the body.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A duplicate string pointer to this header (ie. pass thru)
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_content_length(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_content_length(struct client_state *csp, char **header)
{
- if (csp->content_length != 0) /* Content length has been modified */
+ if (csp->content_length != 0) /* Content length could have been modified */
{
- char * s2 = (char *) zalloc(100);
- sprintf(s2, "Content-Length: %d", (int) csp->content_length);
+ /*
+ * XXX: Shouldn't we check if csp->content_length
+ * is different than the original value?
+ */
+ 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(s2);
- }
- else
- {
- return(strdup(s));
}
+ return JB_ERR_OK;
}
* modified. FIXME: Should we re-compute instead?
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A duplicate string pointer to this header (ie. pass thru)
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_content_md5(const struct parsers *v, const char *s, struct client_state *csp)
+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");
- return(NULL);
- }
- else
- {
- return(strdup(s));
+ freez(*header);
}
+ return JB_ERR_OK;
}
-
/*********************************************************************
*
- * Function : client_accept_encoding
+ * Function : server_content_disposition
*
- * 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.
+ * Description : If enabled, blocks or modifies the "content-disposition" header.
+ * Called from `sed'.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A copy of the client's original or the modified header.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_accept_encoding(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_content_disposition(struct client_state *csp, char **header)
{
- if ((csp->action->flags & ACTION_NO_COMPRESSION) == 0)
+ const char *newval;
+
+ /*
+ * Are we messing with the content-disposition header?
+ */
+ if ((csp->action->flags & ACTION_HIDE_CONTENT_DISPOSITION) == 0)
{
- return(strdup(s));
+ /*Me tinks not*/
+ return JB_ERR_OK;
}
- else
+
+ newval = csp->action->string[ACTION_STRING_CONTENT_DISPOSITION];
+
+ if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
{
- log_error(LOG_LEVEL_HEADER, "Supressed offer to compress content");
+ /*
+ * 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 (!strcmpic(csp->http->ver, "HTTP/1.1"))
+ if (*header == NULL)
{
- return(strdup("Accept-Encoding: identity;q=1.0, *;q=0"));
+ log_error(LOG_LEVEL_HEADER, "Insufficent memory. content-disposition header not fully replaced.");
}
else
{
- return(NULL);
+ log_error(LOG_LEVEL_HEADER, "content-disposition header crunched and replaced with: %s", *header);
}
}
-
-}
-
-
-/*********************************************************************
- *
- * Function : client_te
- *
- * Description : Rewrite the client's TE header so that
- * if doesn't allow compression, if the action applies.
- *
- * Parameters :
- * 1 : v = ignored
- * 2 : s = header string we are "considering"
- * 3 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : A copy of the client's original or the modified header.
- *
- *********************************************************************/
-char *client_te(const struct parsers *v, const char *s, struct client_state *csp)
-{
- if ((csp->action->flags & ACTION_NO_COMPRESSION) == 0)
- {
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "Supressed offer to compress transfer");
- return(NULL);
- }
-
+ return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
/*********************************************************************
*
- * Function : client_referrer
+ * Function : server_last_modified
*
- * Description : Handle the "referer" config setting properly.
+ * Description : Changes Last-Modified header to the actual date
+ * to help hide-if-modified-since.
* Called from `sed'.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : NULL if crunched, or a malloc'ed string with the original
- * or modified header
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_referrer(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_last_modified(struct client_state *csp, char **header)
{
- const char * newval;
- char * s2;
-#ifdef FEATURE_FORCE_LOAD
- /* Since the referrer can include the prefix even
- * even if the request itself is non-forced, we must
- * clean it unconditionally
- */
- strclean(s, FORCE_PREFIX);
-#endif /* def FEATURE_FORCE_LOAD */
+ 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 sending referer?
+ * Are we messing with the Last-Modified header?
*/
- if ((csp->action->flags & ACTION_HIDE_REFERER) == 0)
+ if ((csp->action->flags & ACTION_OVERWRITE_LAST_MODIFIED) == 0)
{
- return(strdup(s));
+ /*Nope*/
+ return JB_ERR_OK;
}
- newval = csp->action->string[ACTION_STRING_REFERER];
-
- /*
- * Are we blocking referer?
- */
- if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
- {
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
- }
+ newval = csp->action->string[ACTION_STRING_LAST_MODIFIED];
- /*
- * Are we forging referer?
- */
- if (0 == strcmpic(newval, "forge"))
+ if (0 == strcmpic(newval, "block") )
{
/*
- * Forge a referer as http://[hostname:port of REQUEST]/
- * to fool stupid checks for in-site links
+ * Blocking Last-Modified header. Useless but why not.
*/
- log_error(LOG_LEVEL_HEADER, "crunch+forge!");
- s2 = strsav(NULL, "Referer: ");
- s2 = strsav(s2, "http://");
- s2 = strsav(s2, csp->http->hostport);
- s2 = strsav(s2, "/");
- return(s2);
+ log_error(LOG_LEVEL_HEADER, "Crunching %s!", *header);
+ freez(*header);
+ return JB_ERR_OK;
}
-
- /*
- * Have we got a fixed referer?
- */
- if (0 == strncmpic(newval, "http://", 7))
- {
+ else if (0 == strcmpic(newval, "reset-to-request-time"))
+ {
/*
- * We have a specific (fixed) referer we want to send.
+ * Setting Last-Modified Header to now.
*/
- char * s3;
-
- log_error(LOG_LEVEL_HEADER, "modified");
+ get_http_time(0, buf);
+ freez(*header);
+ *header = strdup("Last-Modified: ");
+ string_append(header, buf);
- s3 = strsav( NULL, "Referer: " );
- s3 = strsav( s3, newval );
- return(s3);
+ 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;
+ * }
+ * }
+ *
+ */
}
- /* Should never get here! */
- log_error(LOG_LEVEL_ERROR, "Bad parameter: +referer{%s}", newval);
+ 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 */
/*
- * Forge is probably the best default.
- *
- * Forge a referer as http://[hostname:port of REQUEST]/
- * to fool stupid checks for in-site links
+ * 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?
*/
- log_error(LOG_LEVEL_HEADER, "crunch+forge!");
- s2 = strsav(NULL, "Referer: ");
- s2 = strsav(s2, "http://");
- s2 = strsav(s2, csp->http->hostport);
- s2 = strsav(s2, "/");
- return(s2);
+ 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;
}
* bug workarounds. Called from `sed'.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : A malloc'ed pointer to the default agent, or
- * a malloc'ed string pointer to this header (ie. pass thru).
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_uagent(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err client_uagent(struct client_state *csp, char **header)
{
- const char * newval;
- char * s2;
+ const char *newval;
if ((csp->action->flags & ACTION_HIDE_USER_AGENT) == 0)
{
- return(strdup(s));
+ return JB_ERR_OK;
}
newval = csp->action->string[ACTION_STRING_USER_AGENT];
if (newval == NULL)
{
- return(strdup(s));
+ return JB_ERR_OK;
}
- log_error(LOG_LEVEL_HEADER, "modified");
+ freez(*header);
+ *header = strdup("User-Agent: ");
+ string_append(header, newval);
- s2 = strsav( NULL, "User-Agent: " );
- s2 = strsav( s2, newval );
- return(s2);
+ 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 : v = ignored
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : NULL if crunched, or a malloc'ed string to original header
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_ua(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err client_ua(struct client_state *csp, char **header)
{
- if ((csp->action->flags & ACTION_HIDE_USER_AGENT) == 0)
+ if ((csp->action->flags & ACTION_HIDE_USER_AGENT) != 0)
{
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
+ log_error(LOG_LEVEL_HEADER, "crunched User-Agent!");
+ freez(*header);
}
+
+ return JB_ERR_OK;
}
* Called from `sed'.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : NULL if crunched, or a malloc'ed string to
- * modified/original header.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_from(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err client_from(struct client_state *csp, char **header)
{
- const char * newval;
- char * s2;
+ const char *newval;
if ((csp->action->flags & ACTION_HIDE_FROM) == 0)
{
- return(strdup(s));
+ return JB_ERR_OK;
}
+ freez(*header);
+
newval = csp->action->string[ACTION_STRING_FROM];
/*
- * Are we blocking referer?
+ * Are we blocking the e-mail address?
*/
if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
{
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
+ log_error(LOG_LEVEL_HEADER, "crunched From!");
+ return JB_ERR_OK;
}
log_error(LOG_LEVEL_HEADER, " modified");
- s2 = strsav( NULL, "From: " );
- s2 = strsav( s2, newval );
- return(s2);
+ *header = strdup("From: ");
+ string_append(header, newval);
+ return (*header == NULL) ? JB_ERR_MEMORY : JB_ERR_OK;
}
* else we crunch it. Mmmmmmmmmmm ... cookie ......
*
* Parameters :
- * 1 : v = pattern of cookie `sed' found matching
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : Always NULL.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_send_cookie(const struct parsers *v, const char *s, struct client_state *csp)
+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)
{
- enlist(csp->cookie_list, s + v->len + 1);
+ /* strlen("cookie: ") == 8 */
+ result = enlist(csp->cookie_list, *header + 8);
}
else
{
- log_error(LOG_LEVEL_HEADER, " crunch!");
+ log_error(LOG_LEVEL_HEADER, "Crunched outgoing cookie -- yum!");
}
/*
- * Always return NULL here. The cookie header
+ * Always remove the cookie here. The cookie header
* will be sent at the end of the header.
*/
- return(NULL);
+ freez(*header);
+ return result;
}
* also used in the add_client_headers list. Called from `sed'.
*
* Parameters :
- * 1 : v = ignored
- * 2 : s = header (from sed) to "crunch"
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : Always NULL.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *client_x_forwarded(const struct parsers *v, const char *s, struct client_state *csp)
+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 */
- csp->x_forwarded = strdup(s);
+ 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)
+{
+ unsigned int max_forwards;
+
+ if ((0 == strcmpic(csp->http->gpc, "trace"))
+ || (0 == strcmpic(csp->http->gpc, "options")))
+ {
+ if (1 == sscanf(*header, "Max-Forwards: %u", &max_forwards))
+ {
+ if (max_forwards-- >= 1)
+ {
+ sprintf(*header, "Max-Forwards: %u", max_forwards);
+ log_error(LOG_LEVEL_HEADER, "Max forwards of %s request now %d", csp->http->gpc, max_forwards);
+ }
+ else
+ {
+ log_error(LOG_LEVEL_ERROR, "Non-intercepted %s request with Max-Forwards zero!", csp->http->gpc);
+ }
+ }
}
+ 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;
+
/*
- * Always return NULL, since this information
- * will be sent at the end of the header.
+ * 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;
+ }
- return(NULL);
+ 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 : (re)adds the host header. Called from `sed'.
+ * Description : Adds the Host: header field if it is missing.
+ * Called from `sed'.
*
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void client_host_adder(struct client_state *csp)
+jb_err client_host_adder(struct client_state *csp)
{
- char *p = NULL,
- *pos = NULL;
+ char *p;
+ jb_err err;
+
+ if ( !csp->http->hostport || !*(csp->http->hostport))
+ {
+ return JB_ERR_OK;
+ }
- if ( !csp->http->hostport || !*(csp->http->hostport)) return;
- p = strsav(p, "Host: ");
/*
- ** remove 'user:pass@' from 'proto://user:pass@host'
- */
- if ( (pos = strchr( csp->http->hostport, '@')) != NULL )
+ * remove 'user:pass@' from 'proto://user:pass@host'
+ */
+ if ( (p = strchr( csp->http->hostport, '@')) != NULL )
{
- p = strsav(p, pos+1);
+ p++;
}
else
{
- p = strsav(p, csp->http->hostport);
+ p = csp->http->hostport;
}
- log_error(LOG_LEVEL_HEADER, "addh: %s", p);
- enlist(csp->headers, p);
- freez(p);
+ log_error(LOG_LEVEL_HEADER, "addh-unique: Host: %s", p);
+ err = enlist_unique_header(csp->headers, "Host", p);
+ return err;
+
}
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void client_cookie_adder(struct client_state *csp)
+jb_err client_cookie_adder(struct client_state *csp)
{
struct list_entry *lst;
- char *tmp = NULL;
- char *e;
+ 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 = csp->cookie_list->first; lst ; lst = lst->next)
+ for (lst = list1; lst ; lst = lst->next)
{
- if (tmp)
+ if (first_cookie)
{
- tmp = strsav(tmp, "; ");
+ first_cookie = 0;
}
- tmp = strsav(tmp, lst->str);
+ else
+ {
+ string_append(&tmp, "; ");
+ }
+ string_append(&tmp, lst->str);
}
- for (lst = csp->action->multi[ACTION_MULTI_WAFER]->first; lst ; lst = lst->next)
+ for (lst = list2; lst ; lst = lst->next)
{
- if (tmp)
+ if (first_cookie)
{
- tmp = strsav(tmp, "; ");
+ first_cookie = 0;
}
-
- if ((e = cookie_encode(lst->str)))
+ else
{
- tmp = strsav(tmp, e);
- freez(e);
+ string_append(&tmp, "; ");
}
+ string_join(&tmp, cookie_encode(lst->str));
}
- if (tmp)
+ if (tmp == NULL)
{
- char *ret;
-
- ret = strdup("Cookie: ");
- ret = strsav(ret, tmp);
- log_error(LOG_LEVEL_HEADER, "addh: %s", ret);
- enlist(csp->headers, ret);
- freez(tmp);
- freez(ret);
+ return JB_ERR_MEMORY;
}
+ log_error(LOG_LEVEL_HEADER, "addh: %s", tmp);
+ err = enlist(csp->headers, tmp);
+ free(tmp);
+ return err;
}
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void client_accept_encoding_adder(struct client_state *csp)
+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")) )
{
- enlist_unique(csp->headers, "Accept-Encoding: identity;q=1.0, *;q=0", 16);
+ return enlist_unique(csp->headers, "Accept-Encoding: identity;q=1.0, *;q=0", 16);
}
+ return JB_ERR_OK;
}
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void client_xtra_adder(struct client_state *csp)
+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);
- enlist(csp->headers, lst->str);
+ err = enlist(csp->headers, lst->str);
+ if (err)
+ {
+ return err;
+ }
+
}
+ return JB_ERR_OK;
}
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void client_x_forwarded_adder(struct client_state *csp)
+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;
+ return JB_ERR_OK;
}
if (csp->x_forwarded)
{
- p = strsav(p, csp->x_forwarded);
- p = strsav(p, ", ");
- p = strsav(p, csp->ip_addr_str);
+ p = strdup(csp->x_forwarded);
+ string_append(&p, ", ");
}
else
{
- p = strsav(p, "X-Forwarded-For: ");
- p = strsav(p, csp->ip_addr_str);
+ 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);
- enlist(csp->headers, p);
+ err = enlist(csp->headers, p);
+ free(p);
- freez(p);
+ return err;
}
* Parameters :
* 1 : csp = Current client state (buffers, headers, etc...)
*
- * Returns : N/A
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-void connection_close_adder(struct client_state *csp)
+jb_err connection_close_adder(struct client_state *csp)
{
- enlist(csp->headers, "Connection: close");
+ log_error(LOG_LEVEL_HEADER, "Adding: Connection: close");
+ return enlist(csp->headers, "Connection: close");
}
* action applies.
*
* Parameters :
- * 1 : v = parser pattern that matched this header
- * 2 : s = header that matched this pattern
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : Copy of changed or original answer.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_http(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_http(struct client_state *csp, char **header)
{
- char *ret = strdup(s);
-
- sscanf(ret, "HTTP/%*d.%*d %d", &(csp->http->status));
+ 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)
{
- ret[7] = '0';
+ (*header)[7] = '0';
log_error(LOG_LEVEL_HEADER, "Downgraded answer to HTTP/1.0");
}
- return(ret);
+ return JB_ERR_OK;
}
* or accept it. Called from `sed'.
*
* Parameters :
- * 1 : v = parser pattern that matched this header
- * 2 : s = header that matched this pattern
- * 3 : csp = Current client state (buffers, headers, etc...)
+ * 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 : `crumble' or a newly malloc'ed string.
+ * Returns : JB_ERR_OK on success, or
+ * JB_ERR_MEMORY on out-of-memory error.
*
*********************************************************************/
-char *server_set_cookie(const struct parsers *v, const char *s, struct client_state *csp)
+jb_err server_set_cookie(struct client_state *csp, char **header)
{
#ifdef FEATURE_COOKIE_JAR
if (csp->config->jar)
struct tm tm_now;
time (&now);
#ifdef HAVE_LOCALTIME_R
- tm_now = *localtime_r(&now, &tm_now);
+ 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);
+ tm_now = *localtime (&now);
#endif
strftime(tempbuf, BUFFER_SIZE-6, "%b %d %H:%M:%S ", &tm_now);
- fprintf(csp->config->jar, "%s %s\t%s\n", tempbuf, csp->http->host, (s + v->len + 1));
+ /* 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)
{
- return(crumble(v, s, csp));
+ log_error(LOG_LEVEL_HEADER, "Crunched incoming cookie -- yum!");
+ return crumble(csp, header);
}
else if ((csp->action->flags & ACTION_NO_COOKIE_KEEP) != 0)
{
int changed = 0;
/* A variable to store the tag we're working on */
- char * cur_tag;
-
- /* Make a copy of the header we can write to */
- char * result = strdup(s);
- if (result == NULL)
- {
- /* FIXME: This error handling is incorrect */
- return NULL;
- }
+ char *cur_tag;
/* Skip "Set-Cookie:" (11 characters) in header */
- cur_tag = result + 11;
+ cur_tag = *header + 11;
/* skip whitespace between "Set-Cookie:" and value */
while (*cur_tag && ijb_isspace(*cur_tag))
while (*cur_tag)
{
/* Find next tag */
- char * next_tag = strchr(cur_tag, ';');
+ char *next_tag = strchr(cur_tag, ';');
if (next_tag != NULL)
{
/* Skip the ';' character itself */
{
log_error(LOG_LEVEL_HEADER, "Changed cookie to a temporary one.");
}
-
- return result;
}
- return(strdup(s));
+ return JB_ERR_OK;
}
*********************************************************************/
int strclean(const char *string, const char *substring)
{
- int hits = 0, len = strlen(substring);
+ int hits = 0;
+ size_t len;
char *pos, *p;
- while((pos = strstr(string, substring)))
+ len = strlen(substring);
+
+ while((pos = strstr(string, substring)) != NULL)
{
p = pos + len;
do
}
#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:
projects / privoxy.git / blobdiff