-const char parsers_rcs[] = "$Id: parsers.c,v 1.3 2001/05/20 01:21:20 jongfoster Exp $";
+const char parsers_rcs[] = "$Id: parsers.c,v 1.34 2001/10/07 18:50:55 oes Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/parsers.c,v $
* `client_x_forwarded_adder', `client_xtra_adder',
* `content_type', `crumble', `destroy_list', `enlist',
* `flush_socket', `free_http_request', `get_header',
- * `list_to_text', `match', `parse_http_request', `sed',
+ * `list_to_text', `parse_http_request', `sed',
* and `server_set_cookie'.
*
* Copyright : Written by and Copyright (C) 2001 the SourceForge
*
* Revisions :
* $Log: parsers.c,v $
+ * 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
#include "config.h"
+#ifndef _WIN32
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <ctype.h>
+#endif
+
+#include <assert.h>
#include <string.h>
#ifndef _WIN32
#endif
#include "project.h"
+#include "list.h"
#include "parsers.h"
#include "encode.h"
-#include "filters.h"
-#include "loaders.h"
-#include "showargs.h"
-#include "jcc.h"
#include "ssplit.h"
#include "errlog.h"
#include "jbsockets.h"
{ "from:", 5, client_from },
{ "cookie:", 7, client_send_cookie },
{ "x-forwarded-for:", 16, client_x_forwarded },
- { "proxy-connection:", 17, crumble },
-#ifdef DENY_GZIP
- { "Accept-Encoding: gzip", 21, crumble },
-#endif /* def DENY_GZIP */
-#if defined(DETECT_MSIE_IMAGES)
+ { "Accept-Encoding:", 16, client_accept_encoding },
+ { "TE:", 3, client_te },
+#if defined(FEATURE_IMAGE_DETECT_MSIE)
{ "Accept:", 7, client_accept },
-#endif /* defined(DETECT_MSIE_IMAGES) */
-#ifdef FORCE_LOAD
+#endif /* defined(FEATURE_IMAGE_DETECT_MSIE) */
+#ifdef FEATURE_FORCE_LOAD
{ "Host:", 5, client_host },
-#endif /* def FORCE_LOAD */
+#endif /* def FEATURE_FORCE_LOAD */
/* { "if-modified-since:", 18, crumble }, */
+ { "Keep-Alive:", 11, crumble },
+ { "connection:", 11, crumble },
+ { "proxy-connection:", 17, crumble },
{ NULL, 0, NULL }
};
-const struct interceptors intercept_patterns[] = {
- { "show-proxy-args", 14, show_proxy_args },
- { "ijb-send-banner", 14, ijb_send_banner },
-#ifdef TRUST_FILES
- { "ij-untrusted-url", 15, ij_untrusted_url },
-#endif /* def TRUST_FILES */
- { NULL, 0, NULL }
-};
const struct parsers server_patterns[] = {
+ { "HTTP", 4, server_http },
{ "set-cookie:", 11, server_set_cookie },
{ "connection:", 11, crumble },
-#if defined(PCRS) || defined(KILLPOPUPS)
- { "Content-Type:", 13, content_type },
- { "Content-Length:", 15, crumble },
-#endif /* defined(PCRS) || defined(KILLPOPUPS) */
+ { "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 }
};
client_cookie_adder,
client_x_forwarded_adder,
client_xtra_adder,
+ client_accept_encoding_adder,
+ connection_close_adder,
NULL
};
void (* const add_server_headers[])(struct client_state *) = {
+ connection_close_adder,
NULL
};
-/*********************************************************************
- *
- * Function : match
- *
- * Description : Do a `strncmpic' on every pattern in pats.
- *
- * Parameters :
- * 1 : buf = a string to match to a list of patterns
- * 2 : pats = list of strings to compare against buf.
- *
- * Returns : Return the matching "struct parsers *",
- * or NULL if no pattern matches.
- *
- *********************************************************************/
-static const struct parsers *match(char *buf, const struct parsers *pats)
-{
- const struct parsers *v;
-
- if (buf == NULL)
- {
- /* hit me */
- log_error(LOG_LEVEL_ERROR, "NULL parameter to match()");
- return(NULL);
- }
-
- for (v = pats; v->str ; v++)
- {
- if (strncmpic(buf, v->str, v->len) == 0)
- {
- return(v);
- }
- }
- return(NULL);
-
-}
-
-
/*********************************************************************
*
* Function : flush_socket
}
-/*********************************************************************
- *
- * Function : enlist
- *
- * Description : Append a string into a specified string list.
- *
- * Parameters :
- * 1 : h = pointer to list 'dummy' header
- * 2 : s = string to add to the list
- *
- * Returns : N/A
- *
- *********************************************************************/
-void enlist(struct list *h, const char *s)
-{
- struct list *n = (struct list *)malloc(sizeof(*n));
- struct list *l;
-
- if (n)
- {
- n->str = strdup(s);
- n->next = NULL;
-
- if ((l = h->last))
- {
- l->next = n;
- }
- else
- {
- h->next = n;
- }
-
- h->last = n;
- }
-
-}
-
-
-/*********************************************************************
- *
- * Function : destroy_list
- *
- * Description : Destroy a string list (opposite of enlist)
- *
- * Parameters :
- * 1 : h = pointer to list 'dummy' header
- *
- * Returns : N/A
- *
- *********************************************************************/
-void destroy_list(struct list *h)
-{
- struct list *p, *n;
-
- for (p = h->next; p ; p = n)
- {
- n = p->next;
- freez(p->str);
- freez(p);
- }
-
- memset(h, '\0', sizeof(*h));
-
-}
-
-
-/*********************************************************************
- *
- * Function : list_to_text
- *
- * Description : "Flaten" a string list into 1 long \r\n delimited string.
- *
- * Parameters :
- * 1 : h = pointer to list 'dummy' header
- *
- * Returns : NULL on malloc error, else new long string.
- *
- *********************************************************************/
-static char *list_to_text(struct list *h)
-{
- struct list *p;
- char *ret = NULL;
- char *s;
- int size;
-
- size = 0;
-
- for (p = h->next; p ; p = p->next)
- {
- if (p->str)
- {
- size += strlen(p->str) + 2;
- }
- }
-
- if ((ret = (char *)malloc(size + 1)) == NULL)
- {
- return(NULL);
- }
-
- ret[size] = '\0';
-
- s = ret;
-
- for (p = h->next; p ; p = p->next)
- {
- if (p->str)
- {
- strcpy(s, p->str);
- s += strlen(s);
- *s++ = '\r'; *s++ = '\n';
- }
- }
-
- return(ret);
-
-}
-
-
/*********************************************************************
*
* Function : sed
*********************************************************************/
char *sed(const struct parsers pats[], void (* const more_headers[])(struct client_state *), struct client_state *csp)
{
- struct list *p;
+ struct list_entry *p;
const struct parsers *v;
char *hdr;
void (* const *f)();
- for (p = csp->headers->next; p ; p = p->next)
+ for (v = pats; v->str ; v++)
{
- log_error(LOG_LEVEL_HEADER, "scan: %s", p->str);
-
- if ((v = match(p->str, pats)))
+ for (p = csp->headers->first; p ; p = p->next)
{
- hdr = v->parser(v, p->str, csp);
- freez(p->str);
- p->str = hdr;
- }
+ /* 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)
+ {
+ hdr = v->parser(v, p->str, csp);
+ freez((char *)p->str); /* FIXME: Yuck! patching a list...*/
+ p->str = hdr;
+ }
+ }
}
/* place any additional headers on the csp->headers list */
(*f)(csp);
}
- /* add the blank line at the end of the header */
- enlist(csp->headers, "");
-
hdr = list_to_text(csp->headers);
return(hdr);
*********************************************************************/
void free_http_request(struct http_request *http)
{
+ assert(http);
+
freez(http->cmd);
freez(http->gpc);
freez(http->host);
+ freez(http->url);
freez(http->hostport);
freez(http->path);
freez(http->ver);
+ freez(http->host_ip_addr_str);
+ freez(http->user_agent);
}
int n;
memset(http, '\0', sizeof(*http));
-
- http->cmd = strdup(req);
+ http->cmd = strdup(req);
buf = strdup(req);
-
n = ssplit(buf, " \r\n", v, SZ(v), 1, 1);
if (n == 3)
http->ver = strdup(v[2]);
}
-#ifdef WEBDAV
-
-/* This next line is a little ugly, but it simplifies the if statement below. */
-/* Basically if using webDAV, we want the OR condition to use these too. */
-
-/*
- * by haroon
- * These are the headers as defined in RFC2518 to add webDAV support
- */
-
-#define OR_WEBDAV || \
- (0 == strcmpic(v[0], "propfind")) || \
- (0 == strcmpic(v[0], "proppatch")) || \
- (0 == strcmpic(v[0], "move")) || \
- (0 == strcmpic(v[0], "copy")) || \
- (0 == strcmpic(v[0], "mkcol")) || \
- (0 == strcmpic(v[0], "lock")) || \
- (0 == strcmpic(v[0], "unlock"))
-
-#else /* No webDAV support is enabled. Provide an empty OR_WEBDAV macro. */
-
-#define OR_WEBDAV
-
-#endif
-
- /* or it could be a GET or a POST (possibly webDAV too) */
- if ((strcmpic(v[0], "get") == 0) ||
- (strcmpic(v[0], "head") == 0) OR_WEBDAV ||
- (strcmpic(v[0], "post") == 0))
+ /* or it could be any other basic HTTP request type */
+ if ((0 == strcmpic(v[0], "get"))
+ || (0 == strcmpic(v[0], "head"))
+ || (0 == strcmpic(v[0], "post"))
+ || (0 == strcmpic(v[0], "put"))
+ || (0 == strcmpic(v[0], "delete"))
+
+ /* or a webDAV extension (RFC2518) */
+ || (0 == strcmpic(v[0], "propfind"))
+ || (0 == strcmpic(v[0], "proppatch"))
+ || (0 == strcmpic(v[0], "move"))
+ || (0 == strcmpic(v[0], "copy"))
+ || (0 == strcmpic(v[0], "mkcol"))
+ || (0 == strcmpic(v[0], "lock"))
+ || (0 == strcmpic(v[0], "unlock"))
+ )
{
- http->ssl = 0;
- http->gpc = strdup(v[0]);
- url = v[1];
- http->ver = strdup(v[2]);
+ http->ssl = 0;
+ http->gpc = strdup(v[0]);
+ http->url = strdup(v[1]);
+ http->ver = strdup(v[2]);
+ url = v[1];
if (strncmpic(url, "http://", 7) == 0)
{
url += 7;
url = NULL;
}
- if (url && (p = strchr(url, '/')))
+ if (url)
{
- http->path = strdup(p);
- *p = '\0';
- http->hostport = strdup(url);
+ if ((p = strchr(url, '/')))
+ {
+ http->path = strdup(p);
+ *p = '\0';
+ http->hostport = strdup(url);
+ }
+ /*
+ * Repair broken HTTP requests that don't contain a path
+ */
+ else
+ {
+ http->path = strdup("/");
+ http->hostport = strdup(url);
+ }
}
}
}
if (http->path == NULL)
{
- http->path = strdup("");
+ http->path = strdup("/");
}
}
* Returns : Always NULL.
*
*********************************************************************/
-char *crumble(const struct parsers *v, char *s, struct client_state *csp)
+char *crumble(const struct parsers *v, const char *s, struct client_state *csp)
{
log_error(LOG_LEVEL_HEADER, "crunch!");
return(NULL);
}
-#if defined(PCRS) || defined(KILLPOPUPS)
+/*********************************************************************
+ *
+ * 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.
+ *
+ * Parameters :
+ * 1 : v = ignored
+ * 2 : s = header string we are "considering"
+ * 3 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : A duplicate string pointer to this header (ie. pass thru)
+ *
+ *********************************************************************/
+char *server_content_type(const struct parsers *v, const char *s, struct client_state *csp)
+{
+ if (csp->content_type != CT_TABOO)
+ {
+ if (strstr(s, " text/") || strstr(s, "application/x-javascript"))
+ csp->content_type = CT_TEXT;
+ else if (strstr(s, " image/gif"))
+ csp->content_type = CT_GIF;
+ else
+ csp->content_type = 0;
+ }
+
+ return(strdup(s));
+
+}
+
/*********************************************************************
*
- * Function : content_type
+ * Function : server_transfer_coding
*
- * Description : Is this a text/* or javascript MIME Type?
+ * 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 : v = ignored
* Returns : A duplicate string pointer to this header (ie. pass thru)
*
*********************************************************************/
-char *content_type(const struct parsers *v, char *s, struct client_state *csp)
+char *server_transfer_coding(const struct parsers *v, const char *s, struct client_state *csp)
{
- if (strstr (s, " text/") || strstr (s, "application/x-javascript"))
- csp->is_text = 1;
- else
- csp->is_text = 0;
+ /*
+ * Turn off pcrs and gif filtering if body compressed
+ */
+ if (strstr(s, "gzip") || strstr(s, "compress") || strstr(s, "deflate"))
+ {
+ csp->content_type = CT_TABOO;
+ }
+
+ /*
+ * Raise flag if body chunked
+ */
+ if (strstr(s, "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)
+ {
+ return(strdup("Transfer-Encoding: identity"));
+ }
+ }
return(strdup(s));
}
-#endif /* defined(PCRS) || defined(KILLPOPUPS) */
+
+/*********************************************************************
+ *
+ * Function : server_content_encoding
+ *
+ * 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...)
+ *
+ * Returns : A duplicate string pointer to this header (ie. pass thru)
+ *
+ *********************************************************************/
+char *server_content_encoding(const struct parsers *v, const char *s, struct client_state *csp)
+{
+ /*
+ * Turn off pcrs and gif filtering if body compressed
+ */
+ if (strstr(s, "gzip") || strstr(s, "compress") || strstr(s, "deflate"))
+ {
+ csp->content_type = CT_TABOO;
+ }
+
+ return(strdup(s));
+
+}
+/*********************************************************************
+ *
+ * Function : server_content_length
+ *
+ * Description : Adjust Content-Length header if we modified
+ * the body.
+ *
+ * Parameters :
+ * 1 : v = ignored
+ * 2 : s = header string we are "considering"
+ * 3 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : A duplicate string pointer to this header (ie. pass thru)
+ *
+ *********************************************************************/
+char *server_content_length(const struct parsers *v, const char *s, struct client_state *csp)
+{
+ if (csp->content_length != 0) /* Content length has been modified */
+ {
+ char * s2 = (char *) zalloc(100);
+ sprintf(s2, "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));
+ }
+
+}
+
+
+/*********************************************************************
+ *
+ * Function : server_content_md5
+ *
+ * Description : Crumble any Content-MD5 headers if the document was
+ * 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...)
+ *
+ * Returns : A duplicate string pointer to this header (ie. pass thru)
+ *
+ *********************************************************************/
+char *server_content_md5(const struct parsers *v, const char *s, struct client_state *csp)
+{
+ if (csp->flags & CSP_FLAG_MODIFIED)
+ {
+ log_error(LOG_LEVEL_HEADER, "Crunching Content-MD5");
+ return(NULL);
+ }
+ else
+ {
+ return(strdup(s));
+ }
+
+}
+
+
+/*********************************************************************
+ *
+ * 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 : 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_accept_encoding(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 content");
+
+ if (!strcmpic(csp->http->ver, "HTTP/1.1"))
+ {
+ return(strdup("Accept-Encoding: identity;q=1.0, *;q=0"));
+ }
+ else
+ {
+ return(NULL);
+ }
+ }
+
+}
+
+
+/*********************************************************************
+ *
+ * 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);
+ }
+
+}
+
/*********************************************************************
*
* Function : client_referrer
* or modified header
*
*********************************************************************/
-char *client_referrer(const struct parsers *v, char *s, struct client_state *csp)
+char *client_referrer(const struct parsers *v, const char *s, struct client_state *csp)
{
-#ifdef FORCE_LOAD
+ 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 FORCE_LOAD */
+#endif /* def FEATURE_FORCE_LOAD */
+#ifdef FEATURE_TRUST
csp->referrer = strdup(s);
+#endif /* def FEATURE_TRUST */
- if (referrer == NULL)
+ /*
+ * Are we sending referer?
+ */
+ if ((csp->action->flags & ACTION_HIDE_REFERER) == 0)
{
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
+ return(strdup(s));
}
- if (*referrer == '.')
+ newval = csp->action->string[ACTION_STRING_REFERER];
+
+ /*
+ * Are we blocking referer?
+ */
+ if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
{
- return(strdup(s));
+ log_error(LOG_LEVEL_HEADER, "crunch!");
+ return(NULL);
}
- if (*referrer == '@')
+ /*
+ * Are we forging referer?
+ */
+ if (0 == strcmpic(newval, "forge"))
{
- if (csp->permissions & PERMIT_COOKIE_READ)
- {
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
- }
+ /*
+ * Forge a referer as http://[hostname:port of REQUEST]/
+ * to fool stupid checks for in-site links
+ */
+ 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);
}
/*
- * New option § or L: Forge a referer as http://[hostname:port of REQUEST]/
- * to fool stupid checks for in-site links
+ * Have we got a fixed referer?
*/
-
- if (*referrer == '§' || *referrer == 'L')
+ if (0 == strncmpic(newval, "http://", 7))
{
- if (csp->permissions & PERMIT_COOKIE_READ)
- {
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "crunch+forge!");
- s = strsav(NULL, "Referer: ");
- s = strsav(s, "http://");
- s = strsav(s, csp->http->hostport);
- s = strsav(s, "/");
- return(s);
- }
- }
+ /*
+ * We have a specific (fixed) referer we want to send.
+ */
+ char * s3;
- log_error(LOG_LEVEL_HEADER, "modified");
+ log_error(LOG_LEVEL_HEADER, "modified");
+
+ s3 = strsav( NULL, "Referer: " );
+ s3 = strsav( s3, newval );
+ return(s3);
+ }
- s = strsav( NULL, "Referer: " );
- s = strsav( s, referrer );
- return(s);
+ /* Should never get here! */
+ log_error(LOG_LEVEL_ERROR, "Bad parameter: +referer{%s}", newval);
+ /*
+ * Forge is probably the best default.
+ *
+ * Forge a referer as http://[hostname:port of REQUEST]/
+ * to fool stupid checks for in-site links
+ */
+ 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);
}
*
* Function : client_uagent
*
- * Description : Handle the "user-agent" config setting properly.
- * Called from `sed'.
+ * Description : Handle the "user-agent" config setting properly
+ * and remember its original value to enable browser
+ * bug workarounds. Called from `sed'.
*
* Parameters :
* 1 : v = ignored
* a malloc'ed string pointer to this header (ie. pass thru).
*
*********************************************************************/
-char *client_uagent(const struct parsers *v, char *s, struct client_state *csp)
+char *client_uagent(const struct parsers *v, const char *s, struct client_state *csp)
{
-#ifdef DETECT_MSIE_IMAGES
+ const char * newval;
+ char * s2;
+
+ /* Save the client's User-Agent: value */
+ if (strlen(s) >= 12)
+ {
+ csp->http->user_agent = strdup(s + 12);
+ }
+
+#ifdef FEATURE_IMAGE_DETECT_MSIE
if (strstr (s, "MSIE "))
{
/* This is Microsoft Internet Explorer.
*/
csp->accept_types |= ACCEPT_TYPE_IS_MSIE;
}
-#endif /* def DETECT_MSIE_IMAGES */
+#endif /* def FEATURE_IMAGE_DETECT_MSIE */
- if (uagent == NULL)
- {
- log_error(LOG_LEVEL_HEADER, "default");
- return(strdup(DEFAULT_USER_AGENT));
- }
-
- if (*uagent == '.')
+ if ((csp->action->flags & ACTION_HIDE_USER_AGENT) == 0)
{
return(strdup(s));
}
- if (*uagent == '@')
+ newval = csp->action->string[ACTION_STRING_USER_AGENT];
+ if (newval == NULL)
{
- if (csp->permissions & PERMIT_COOKIE_READ)
- {
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "default");
- return(strdup(DEFAULT_USER_AGENT));
- }
+ return(strdup(s));
}
log_error(LOG_LEVEL_HEADER, "modified");
- s = strsav( NULL, "User-Agent: " );
- s = strsav( s, uagent );
- return(s);
+ s2 = strsav( NULL, "User-Agent: " );
+ s2 = strsav( s2, newval );
+ return(s2);
}
* Returns : NULL if crunched, or a malloc'ed string to original header
*
*********************************************************************/
-char *client_ua(const struct parsers *v, char *s, struct client_state *csp)
+char *client_ua(const struct parsers *v, const char *s, struct client_state *csp)
{
- if (uagent == NULL)
- {
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
- }
-
- if (*uagent == '.')
+ if ((csp->action->flags & ACTION_HIDE_USER_AGENT) == 0)
{
return(strdup(s));
}
-
- if (*uagent == '@')
+ else
{
- if (csp->permissions & PERMIT_COOKIE_READ)
- {
- return(strdup(s));
- }
- else
- {
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
- }
+ log_error(LOG_LEVEL_HEADER, "crunch!");
+ return(NULL);
}
-
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
-
}
* modified/original header.
*
*********************************************************************/
-char *client_from(const struct parsers *v, char *s, struct client_state *csp)
+char *client_from(const struct parsers *v, const char *s, struct client_state *csp)
{
- /* if not set, zap it */
- if (from == NULL)
+ const char * newval;
+ char * s2;
+
+ if ((csp->action->flags & ACTION_HIDE_FROM) == 0)
{
- log_error(LOG_LEVEL_HEADER, "crunch!");
- return(NULL);
+ return(strdup(s));
}
- if (*from == '.')
+ newval = csp->action->string[ACTION_STRING_FROM];
+
+ /*
+ * Are we blocking referer?
+ */
+ if ((newval == NULL) || (0 == strcmpic(newval, "block")) )
{
- return(strdup(s));
+ log_error(LOG_LEVEL_HEADER, "crunch!");
+ return(NULL);
}
log_error(LOG_LEVEL_HEADER, " modified");
- s = strsav( NULL, "From: " );
- s = strsav( s, from );
- return(s);
+ s2 = strsav( NULL, "From: " );
+ s2 = strsav( s2, newval );
+ return(s2);
}
* Returns : Always NULL.
*
*********************************************************************/
-char *client_send_cookie(const struct parsers *v, char *s, struct client_state *csp)
+char *client_send_cookie(const struct parsers *v, const char *s, struct client_state *csp)
{
- if (csp->permissions & PERMIT_COOKIE_READ)
+ if ((csp->action->flags & ACTION_NO_COOKIE_READ) == 0)
{
enlist(csp->cookie_list, s + v->len + 1);
}
* Returns : Always NULL.
*
*********************************************************************/
-char *client_x_forwarded(const struct parsers *v, char *s, struct client_state *csp)
+char *client_x_forwarded(const struct parsers *v, const char *s, struct client_state *csp)
{
- if (add_forwarded)
+ if ((csp->action->flags & ACTION_HIDE_FORWARDED) == 0)
{
+ /* Save it so we can re-add it later */
csp->x_forwarded = strdup(s);
}
}
-#if defined(DETECT_MSIE_IMAGES)
+#if defined(FEATURE_IMAGE_DETECT_MSIE)
/*********************************************************************
*
* Function : client_accept
* Returns : Duplicate of argument s.
*
*********************************************************************/
-char *client_accept(const struct parsers *v, char *s, struct client_state *csp)
+char *client_accept(const struct parsers *v, const char *s, struct client_state *csp)
{
-#ifdef DETECT_MSIE_IMAGES
+#ifdef FEATURE_IMAGE_DETECT_MSIE
if (strstr (s, "image/gif"))
{
/* Client will accept HTML. If this seems counterintuitive,
{
csp->accept_types |= ACCEPT_TYPE_MSIE_IMAGE;
}
-#endif /* def DETECT_MSIE_IMAGES */
+#endif /* def FEATURE_IMAGE_DETECT_MSIE */
return(strdup(s));
}
-#endif /* defined(DETECT_MSIE_IMAGES) */
+#endif /* defined(FEATURE_IMAGE_DETECT_MSIE) */
*********************************************************************/
void client_cookie_adder(struct client_state *csp)
{
- struct list *l;
+ struct list_entry *lst;
char *tmp = NULL;
char *e;
- for (l = csp->cookie_list->next; l ; l = l->next)
+ for (lst = csp->cookie_list->first; lst ; lst = lst->next)
{
if (tmp)
{
tmp = strsav(tmp, "; ");
}
- tmp = strsav(tmp, l->str);
+ tmp = strsav(tmp, lst->str);
}
- for (l = wafer_list->next; l ; l = l->next)
+ for (lst = csp->action->multi[ACTION_MULTI_WAFER]->first; lst ; lst = lst->next)
{
if (tmp)
{
tmp = strsav(tmp, "; ");
}
- if ((e = cookie_encode(l->str)))
+ if ((e = cookie_encode(lst->str)))
{
tmp = strsav(tmp, e);
freez(e);
}
+/*********************************************************************
+ *
+ * Function : client_accept_encoding_adder
+ *
+ * Description : Add an Accept-Encoding header to the client's request
+ * that disables compression if the action applies, and
+ * the header is not already there. Called from `sed'.
+ * Note: For HTTP/1.0, the absence of the header is enough.
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+void 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);
+ }
+
+}
+
+
/*********************************************************************
*
* Function : client_xtra_adder
*********************************************************************/
void client_xtra_adder(struct client_state *csp)
{
- struct list *l;
+ struct list_entry *lst;
- for (l = xtra_list->next; l ; l = l->next)
+ for (lst = csp->action->multi[ACTION_MULTI_ADD_HEADER]->first;
+ lst ; lst = lst->next)
{
- log_error(LOG_LEVEL_HEADER, "addh: %s", l->str);
- enlist(csp->headers, l->str);
+ log_error(LOG_LEVEL_HEADER, "addh: %s", lst->str);
+ enlist(csp->headers, lst->str);
}
}
{
char *p = NULL;
- if (add_forwarded == 0) return;
+ if ((csp->action->flags & ACTION_HIDE_FORWARDED) != 0)
+ {
+ return;
+ }
if (csp->x_forwarded)
{
log_error(LOG_LEVEL_HEADER, "addh: %s", p);
enlist(csp->headers, p);
+ freez(p);
+}
+
+
+/*********************************************************************
+ *
+ * Function : connection_close_adder
+ *
+ * Description : Adds a "Connection: close" header to csp->headers
+ * as a temporary fix for the needed but missing HTTP/1.1
+ * support. Called from `sed'.
+ * FIXME: This whole function shouldn't be neccessary!
+ *
+ * Parameters :
+ * 1 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : N/A
+ *
+ *********************************************************************/
+void connection_close_adder(struct client_state *csp)
+{
+ enlist(csp->headers, "Connection: close");
+}
+
+
+/*********************************************************************
+ *
+ * Function : server_http
+ *
+ * Description : - Save the HTTP Status into csp->http->status
+ * - Set CT_TABOO to prevent filtering if the answer
+ * is a partial range (HTTP status 206)
+ * - Rewrite HTTP/1.1 answers to HTTP/1.0 if +downgrade
+ * action applies.
+ *
+ * Parameters :
+ * 1 : v = parser pattern that matched this header
+ * 2 : s = header that matched this pattern
+ * 3 : csp = Current client state (buffers, headers, etc...)
+ *
+ * Returns : Copy of changed or original answer.
+ *
+ *********************************************************************/
+char *server_http(const struct parsers *v, const char *s, struct client_state *csp)
+{
+ char *ret = strdup(s);
+
+ sscanf(ret, "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';
+ log_error(LOG_LEVEL_HEADER, "Downgraded answer to HTTP/1.0");
+ }
+ return(ret);
+
}
* Returns : `crumble' or a newly malloc'ed string.
*
*********************************************************************/
-char *server_set_cookie(const struct parsers *v, char *s, struct client_state *csp)
+char *server_set_cookie(const struct parsers *v, const char *s, struct client_state *csp)
{
-#ifdef JAR_FILES
- if (jar)
+#ifdef FEATURE_COOKIE_JAR
+ if (csp->config->jar)
{
- fprintf(jar, "%s\t%s\n", csp->http->host, (s + v->len + 1));
+ fprintf(csp->config->jar, "%s\t%s\n", csp->http->host, (s + v->len + 1));
}
-#endif /* def JAR_FILES */
+#endif /* def FEATURE_COOKIE_JAR */
- if (!(csp->permissions & PERMIT_COOKIE_SET))
+ if ((csp->action->flags & ACTION_NO_COOKIE_SET) != 0)
{
return(crumble(v, s, csp));
}
}
-#ifdef FORCE_LOAD
+#ifdef FEATURE_FORCE_LOAD
/*********************************************************************
*
* Function : client_host
* Returns : A malloc'ed pointer to the cleaned host header
*
*********************************************************************/
-char *client_host(const struct parsers *v, char *s, struct client_state *csp)
+char *client_host(const struct parsers *v, const char *s, struct client_state *csp)
{
char *cleanhost = strdup(s);
- if(csp->force)
+ if(csp->flags & CSP_FLAG_FORCED)
+ {
strclean(cleanhost, FORCE_PREFIX);
+ }
return(cleanhost);
}
-#endif /* def FORCE_LOAD */
+#endif /* def FEATURE_FORCE_LOAD */
-#ifdef FORCE_LOAD
+#ifdef FEATURE_FORCE_LOAD
/*********************************************************************
*
* Function : strclean
return(hits);
}
-#endif /* def FORCE_LOAD */
+#endif /* def FEATURE_FORCE_LOAD */
/*