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tor-android/external/privoxy/urlmatch.c

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adding in privoxy directly to Orbot repo
2012-05-03 18:32:18 +00:00
const char urlmatch_rcs[] = "$Id: urlmatch.c,v 1.47 2009/03/02 19:18:10 fabiankeil Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/urlmatch.c,v $
*
* Purpose : Declares functions to match URLs against URL
* patterns.
*
* Copyright : Written by and Copyright (C) 2001-2009
* the Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* The GNU General Public License should be included with
* this file. If not, you can view it at
* http://www.gnu.org/copyleft/gpl.html
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Revisions :
* $Log: urlmatch.c,v $
* Revision 1.47 2009/03/02 19:18:10 fabiankeil
* Streamline parse_http_request()'s prototype. As
* cparser pointed out it doesn't actually use csp.
*
* Revision 1.46 2009/02/11 19:31:32 fabiankeil
* Reject request lines that end with neither HTTP/1.0 nor HTTP/1.1.
*
* Revision 1.45 2008/06/21 21:19:18 fabiankeil
* Silence bogus compiler warning.
*
* Revision 1.44 2008/05/04 16:18:32 fabiankeil
* Provide parse_http_url() with a third parameter to specify
* whether or not URLs without protocol are acceptable.
*
* Revision 1.43 2008/05/04 13:30:55 fabiankeil
* Streamline parse_http_url()'s prototype.
*
* Revision 1.42 2008/05/04 13:24:16 fabiankeil
* If the method isn't CONNECT, reject URLs without protocol.
*
* Revision 1.41 2008/05/02 09:51:34 fabiankeil
* In parse_http_url(), don't muck around with values
* that are none of its business: require an initialized
* http structure and never unset http->ssl.
*
* Revision 1.40 2008/04/23 16:12:28 fabiankeil
* Free with freez().
*
* Revision 1.39 2008/04/22 16:27:42 fabiankeil
* In parse_http_request(), remove a pointless
* temporary variable and free the buffer earlier.
*
* Revision 1.38 2008/04/18 05:17:18 fabiankeil
* Mark simplematch()'s parameters as immutable.
*
* Revision 1.37 2008/04/17 14:53:29 fabiankeil
* Move simplematch() into urlmatch.c as it's only
* used to match (old-school) domain patterns.
*
* Revision 1.36 2008/04/14 18:19:48 fabiankeil
* Remove now-pointless cast in create_url_spec().
*
* Revision 1.35 2008/04/14 18:11:21 fabiankeil
* The compiler might not notice it, but the buffer passed to
* create_url_spec() is modified later on and thus shouldn't
* be declared immutable.
*
* Revision 1.34 2008/04/13 13:32:07 fabiankeil
* Factor URL pattern compilation out of create_url_spec().
*
* Revision 1.33 2008/04/12 14:03:13 fabiankeil
* Remove an obvious comment and improve another one.
*
* Revision 1.32 2008/04/12 12:38:06 fabiankeil
* Factor out duplicated code to compile host, path and tag patterns.
*
* Revision 1.31 2008/04/10 14:41:04 fabiankeil
* Ditch url_spec's path member now that it's no longer used.
*
* Revision 1.30 2008/04/10 04:24:24 fabiankeil
* Stop duplicating the plain text representation of the path regex
* (and keeping the copy around). Once the regex is compiled it's no
* longer useful.
*
* Revision 1.29 2008/04/10 04:17:56 fabiankeil
* In url_match(), check the right member for NULL when determining
* whether there's a path regex to execute. Looking for a plain-text
* representation works as well, but it looks "interesting" and that
* member will be removed soonish anyway.
*
* Revision 1.28 2008/04/08 16:07:39 fabiankeil
* Make it harder to mistake url_match()'s
* second parameter for an url_spec.
*
* Revision 1.27 2008/04/08 15:44:33 fabiankeil
* Save a bit of memory (and a few cpu cycles) by not bothering to
* compile slash-only path regexes that don't affect the result.
*
* Revision 1.26 2008/04/07 16:57:18 fabiankeil
* - Use free_url_spec() more consistently.
* - Let it reset url->dcount just in case.
*
* Revision 1.25 2008/04/06 15:18:38 fabiankeil
* Oh well, rename the --enable-pcre-host-patterns option to
* --enable-extended-host-patterns as it's not really PCRE syntax.
*
* Revision 1.24 2008/04/06 14:54:26 fabiankeil
* Use PCRE syntax in host patterns when configured
* with --enable-pcre-host-patterns.
*
* Revision 1.23 2008/04/05 12:19:20 fabiankeil
* Factor compile_host_pattern() out of create_url_spec().
*
* Revision 1.22 2008/03/30 15:02:32 fabiankeil
* SZitify unknown_method().
*
* Revision 1.21 2007/12/24 16:34:23 fabiankeil
* Band-aid (and micro-optimization) that makes it less likely to run out of
* stack space with overly-complex path patterns. Probably masks the problem
* reported by Lee in #1856679. Hohoho.
*
* Revision 1.20 2007/09/02 15:31:20 fabiankeil
* Move match_portlist() from filter.c to urlmatch.c.
* It's used for url matching, not for filtering.
*
* Revision 1.19 2007/09/02 13:42:11 fabiankeil
* - Allow port lists in url patterns.
* - Ditch unused url_spec member pathlen.
*
* Revision 1.18 2007/07/30 16:42:21 fabiankeil
* Move the method check into unknown_method()
* and loop through the known methods instead
* of using a screen-long OR chain.
*
* Revision 1.17 2007/04/15 16:39:21 fabiankeil
* Introduce tags as alternative way to specify which
* actions apply to a request. At the moment tags can be
* created based on client and server headers.
*
* Revision 1.16 2007/02/13 13:59:24 fabiankeil
* Remove redundant log message.
*
* Revision 1.15 2007/01/28 16:11:23 fabiankeil
* Accept WebDAV methods for subversion
* in parse_http_request(). Closes FR 1581425.
*
* Revision 1.14 2007/01/06 14:23:56 fabiankeil
* Fix gcc43 warnings. Mark *csp as immutable
* for parse_http_url() and url_match().
* Replace a sprintf call with snprintf.
*
* Revision 1.13 2006/12/06 19:50:54 fabiankeil
* parse_http_url() now handles intercepted
* HTTP request lines as well. Moved parts
* of parse_http_url()'s code into
* init_domain_components() so that it can
* be reused in chat().
*
* Revision 1.12 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 1.10.2.7 2003/05/17 15:57:24 oes
* - parse_http_url now checks memory allocation failure for
* duplication of "*" URL and rejects "*something" URLs
* Closes bug #736344
* - Added a comment to what might look like a bug in
* create_url_spec (see !bug #736931)
* - Comment cosmetics
*
* Revision 1.10.2.6 2003/05/07 12:39:48 oes
* Fix typo: Default port for https URLs is 443, not 143.
* Thanks to Scott Tregear for spotting this one.
*
* Revision 1.10.2.5 2003/02/28 13:09:29 oes
* Fixed a rare double free condition as per Bug #694713
*
* Revision 1.10.2.4 2003/02/28 12:57:44 oes
* Moved freeing of http request structure to its owner
* as per Dan Price's observations in Bug #694713
*
* Revision 1.10.2.3 2002/11/12 16:50:40 oes
* Fixed memory leak in parse_http_request() reported by Oliver Stoeneberg. Fixes bug #637073
*
* Revision 1.10.2.2 2002/09/25 14:53:15 oes
* Added basic support for OPTIONS and TRACE HTTP methods:
* parse_http_url now recognizes the "*" URI as well as
* the OPTIONS and TRACE method keywords.
*
* Revision 1.10.2.1 2002/06/06 19:06:44 jongfoster
* Adding support for proprietary Microsoft WebDAV extensions
*
* Revision 1.10 2002/05/12 21:40:37 jongfoster
* - Removing some unused code
*
* Revision 1.9 2002/04/04 00:36:36 gliptak
* always use pcre for matching
*
* Revision 1.8 2002/04/03 23:32:47 jongfoster
* Fixing memory leak on error
*
* Revision 1.7 2002/03/26 22:29:55 swa
* we have a new homepage!
*
* Revision 1.6 2002/03/24 13:25:43 swa
* name change related issues
*
* Revision 1.5 2002/03/13 00:27:05 jongfoster
* Killing warnings
*
* Revision 1.4 2002/03/07 03:46:17 oes
* Fixed compiler warnings
*
* Revision 1.3 2002/03/03 14:51:11 oes
* Fixed CLF logging: Added ocmd member for client's request to struct http_request
*
* Revision 1.2 2002/01/21 00:14:09 jongfoster
* Correcting comment style
* Fixing an uninitialized memory bug in create_url_spec()
*
* Revision 1.1 2002/01/17 20:53:46 jongfoster
* Moving all our URL and URL pattern parsing code to the same file - it
* was scattered around in filters.c, loaders.c and parsers.c.
*
* Providing a single, simple url_match(pattern,url) function - rather than
* the 3-line match routine which was repeated all over the place.
*
* Renaming free_url to free_url_spec, since it frees a struct url_spec.
*
* Providing parse_http_url() so that URLs can be parsed without faking a
* HTTP request line for parse_http_request() or repeating the parsing
* code (both of which were techniques that were actually in use).
*
* Standardizing that struct http_request is used to represent a URL, and
* struct url_spec is used to represent a URL pattern. (Before, URLs were
* represented as seperate variables and a partially-filled-in url_spec).
*
*
*********************************************************************/
#include "config.h"
#ifndef _WIN32
#include <stdio.h>
#include <sys/types.h>
#endif
#include <stdlib.h>
#include <ctype.h>
#include <assert.h>
#include <string.h>
#if !defined(_WIN32) && !defined(__OS2__)
#include <unistd.h>
#endif
#include "project.h"
#include "urlmatch.h"
#include "ssplit.h"
#include "miscutil.h"
#include "errlog.h"
const char urlmatch_h_rcs[] = URLMATCH_H_VERSION;
enum regex_anchoring {NO_ANCHORING, LEFT_ANCHORED, RIGHT_ANCHORED};
static jb_err compile_host_pattern(struct url_spec *url, const char *host_pattern);
/*********************************************************************
*
* Function : free_http_request
*
* Description : Freez a http_request structure
*
* Parameters :
* 1 : http = points to a http_request structure to free
*
* Returns : N/A
*
*********************************************************************/
void free_http_request(struct http_request *http)
{
assert(http);
freez(http->cmd);
freez(http->ocmd);
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->dbuffer);
freez(http->dvec);
http->dcount = 0;
}
/*********************************************************************
*
* Function : init_domain_components
*
* Description : Splits the domain name so we can compare it
* against wildcards. It used to be part of
* parse_http_url, but was separated because the
* same code is required in chat in case of
* intercepted requests.
*
* Parameters :
* 1 : http = pointer to the http structure to hold elements.
*
* Returns : JB_ERR_OK on success
* JB_ERR_MEMORY on out of memory
* JB_ERR_PARSE on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err init_domain_components(struct http_request *http)
{
char *vec[BUFFER_SIZE];
size_t size;
char *p;
http->dbuffer = strdup(http->host);
if (NULL == http->dbuffer)
{
return JB_ERR_MEMORY;
}
/* map to lower case */
for (p = http->dbuffer; *p ; p++)
{
*p = (char)tolower((int)(unsigned char)*p);
}
/* split the domain name into components */
http->dcount = ssplit(http->dbuffer, ".", vec, SZ(vec), 1, 1);
if (http->dcount <= 0)
{
/*
* Error: More than SZ(vec) components in domain
* or: no components in domain
*/
log_error(LOG_LEVEL_ERROR, "More than SZ(vec) components in domain or none at all.");
return JB_ERR_PARSE;
}
/* save a copy of the pointers in dvec */
size = (size_t)http->dcount * sizeof(*http->dvec);
http->dvec = (char **)malloc(size);
if (NULL == http->dvec)
{
return JB_ERR_MEMORY;
}
memcpy(http->dvec, vec, size);
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : parse_http_url
*
* Description : Parse out the host and port from the URL. Find the
* hostname & path, port (if ':'), and/or password (if '@')
*
* Parameters :
* 1 : url = URL (or is it URI?) to break down
* 2 : http = pointer to the http structure to hold elements.
* Must be initialized with valid values (like NULLs).
* 3 : require_protocol = Whether or not URLs without
* protocol are acceptable.
*
* Returns : JB_ERR_OK on success
* JB_ERR_MEMORY on out of memory
* JB_ERR_PARSE on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err parse_http_url(const char *url, struct http_request *http, int require_protocol)
{
int host_available = 1; /* A proxy can dream. */
/*
* Save our initial URL
*/
http->url = strdup(url);
if (http->url == NULL)
{
return JB_ERR_MEMORY;
}
/*
* Check for * URI. If found, we're done.
*/
if (*http->url == '*')
{
if ( NULL == (http->path = strdup("*"))
|| NULL == (http->hostport = strdup("")) )
{
return JB_ERR_MEMORY;
}
if (http->url[1] != '\0')
{
return JB_ERR_PARSE;
}
return JB_ERR_OK;
}
/*
* Split URL into protocol,hostport,path.
*/
{
char *buf;
char *url_noproto;
char *url_path;
buf = strdup(url);
if (buf == NULL)
{
return JB_ERR_MEMORY;
}
/* Find the start of the URL in our scratch space */
url_noproto = buf;
if (strncmpic(url_noproto, "http://", 7) == 0)
{
url_noproto += 7;
}
else if (strncmpic(url_noproto, "https://", 8) == 0)
{
/*
* Should only happen when called from cgi_show_url_info().
*/
url_noproto += 8;
http->ssl = 1;
}
else if (*url_noproto == '/')
{
/*
* Short request line without protocol and host.
* Most likely because the client's request
* was intercepted and redirected into Privoxy.
*/
http->host = NULL;
host_available = 0;
}
else if (require_protocol)
{
freez(buf);
return JB_ERR_PARSE;
}
url_path = strchr(url_noproto, '/');
if (url_path != NULL)
{
/*
* Got a path.
*
* NOTE: The following line ignores the path for HTTPS URLS.
* This means that you get consistent behaviour if you type a
* https URL in and it's parsed by the function. (When the
* URL is actually retrieved, SSL hides the path part).
*/
http->path = strdup(http->ssl ? "/" : url_path);
*url_path = '\0';
http->hostport = strdup(url_noproto);
}
else
{
/*
* Repair broken HTTP requests that don't contain a path,
* or CONNECT requests
*/
http->path = strdup("/");
http->hostport = strdup(url_noproto);
}
freez(buf);
if ( (http->path == NULL)
|| (http->hostport == NULL))
{
return JB_ERR_MEMORY;
}
}
if (!host_available)
{
/* Without host, there is nothing left to do here */
return JB_ERR_OK;
}
/*
* Split hostport into user/password (ignored), host, port.
*/
{
char *buf;
char *host;
char *port;
buf = strdup(http->hostport);
if (buf == NULL)
{
return JB_ERR_MEMORY;
}
/* check if url contains username and/or password */
host = strchr(buf, '@');
if (host != NULL)
{
/* Contains username/password, skip it and the @ sign. */
host++;
}
else
{
/* No username or password. */
host = buf;
}
/* check if url contains port */
port = strchr(host, ':');
if (port != NULL)
{
/* Contains port */
/* Terminate hostname and point to start of port string */
*port++ = '\0';
http->port = atoi(port);
}
else
{
/* No port specified. */
http->port = (http->ssl ? 443 : 80);
}
http->host = strdup(host);
freez(buf);
if (http->host == NULL)
{
return JB_ERR_MEMORY;
}
}
/*
* Split domain name so we can compare it against wildcards
*/
return init_domain_components(http);
}
/*********************************************************************
*
* Function : unknown_method
*
* Description : Checks whether a method is unknown.
*
* Parameters :
* 1 : method = points to a http method
*
* Returns : TRUE if it's unknown, FALSE otherwise.
*
*********************************************************************/
static int unknown_method(const char *method)
{
static const char *known_http_methods[] = {
/* Basic HTTP request type */
"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS", "TRACE", "CONNECT",
/* webDAV extensions (RFC2518) */
"PROPFIND", "PROPPATCH", "MOVE", "COPY", "MKCOL", "LOCK", "UNLOCK",
/*
* Microsoft webDAV extension for Exchange 2000. See:
* http://lists.w3.org/Archives/Public/w3c-dist-auth/2002JanMar/0001.html
* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
*/
"BCOPY", "BMOVE", "BDELETE", "BPROPFIND", "BPROPPATCH",
/*
* Another Microsoft webDAV extension for Exchange 2000. See:
* http://systems.cs.colorado.edu/grunwald/MobileComputing/Papers/draft-cohen-gena-p-base-00.txt
* http://lists.w3.org/Archives/Public/w3c-dist-auth/2002JanMar/0001.html
* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
*/
"SUBSCRIBE", "UNSUBSCRIBE", "NOTIFY", "POLL",
/*
* Yet another WebDAV extension, this time for
* Web Distributed Authoring and Versioning (RFC3253)
*/
"VERSION-CONTROL", "REPORT", "CHECKOUT", "CHECKIN", "UNCHECKOUT",
"MKWORKSPACE", "UPDATE", "LABEL", "MERGE", "BASELINE-CONTROL", "MKACTIVITY",
};
int i;
for (i = 0; i < SZ(known_http_methods); i++)
{
if (0 == strcmpic(method, known_http_methods[i]))
{
return FALSE;
}
}
return TRUE;
}
/*********************************************************************
*
* Function : parse_http_request
*
* Description : Parse out the host and port from the URL. Find the
* hostname & path, port (if ':'), and/or password (if '@')
*
* Parameters :
* 1 : req = HTTP request line to break down
* 2 : http = pointer to the http structure to hold elements
*
* Returns : JB_ERR_OK on success
* JB_ERR_MEMORY on out of memory
* JB_ERR_CGI_PARAMS on malformed command/URL
* or >100 domains deep.
*
*********************************************************************/
jb_err parse_http_request(const char *req, struct http_request *http)
{
char *buf;
char *v[10]; /* XXX: Why 10? We should only need three. */
int n;
jb_err err;
memset(http, '\0', sizeof(*http));
buf = strdup(req);
if (buf == NULL)
{
return JB_ERR_MEMORY;
}
n = ssplit(buf, " \r\n", v, SZ(v), 1, 1);
if (n != 3)
{
freez(buf);
return JB_ERR_PARSE;
}
/*
* Fail in case of unknown methods
* which we might not handle correctly.
*
* XXX: There should be a config option
* to forward requests with unknown methods
* anyway. Most of them don't need special
* steps.
*/
if (unknown_method(v[0]))
{
log_error(LOG_LEVEL_ERROR, "Unknown HTTP method detected: %s", v[0]);
freez(buf);
return JB_ERR_PARSE;
}
if (strcmpic(v[2], "HTTP/1.1") && strcmpic(v[2], "HTTP/1.0"))
{
log_error(LOG_LEVEL_ERROR, "The only supported HTTP "
"versions are 1.0 and 1.1. This rules out: %s", v[2]);
freez(buf);
return JB_ERR_PARSE;
}
http->ssl = !strcmpic(v[0], "CONNECT");
err = parse_http_url(v[1], http, !http->ssl);
if (err)
{
freez(buf);
return err;
}
/*
* Copy the details into the structure
*/
http->cmd = strdup(req);
http->gpc = strdup(v[0]);
http->ver = strdup(v[2]);
freez(buf);
if ( (http->cmd == NULL)
|| (http->gpc == NULL)
|| (http->ver == NULL) )
{
return JB_ERR_MEMORY;
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : compile_pattern
*
* Description : Compiles a host, domain or TAG pattern.
*
* Parameters :
* 1 : pattern = The pattern to compile.
* 2 : anchoring = How the regex should be anchored.
* Can be either one of NO_ANCHORING,
* LEFT_ANCHORED or RIGHT_ANCHORED.
* 3 : url = In case of failures, the spec member is
* logged and the structure freed.
* 4 : regex = Where the compiled regex should be stored.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_pattern(const char *pattern, enum regex_anchoring anchoring,
struct url_spec *url, regex_t **regex)
{
int errcode;
char rebuf[BUFFER_SIZE];
const char *fmt = NULL;
assert(pattern);
assert(strlen(pattern) < sizeof(rebuf) - 2);
if (pattern[0] == '\0')
{
*regex = NULL;
return JB_ERR_OK;
}
switch (anchoring)
{
case NO_ANCHORING:
fmt = "%s";
break;
case RIGHT_ANCHORED:
fmt = "%s$";
break;
case LEFT_ANCHORED:
fmt = "^%s";
break;
default:
log_error(LOG_LEVEL_FATAL,
"Invalid anchoring in compile_pattern %d", anchoring);
}
*regex = zalloc(sizeof(**regex));
if (NULL == *regex)
{
free_url_spec(url);
return JB_ERR_MEMORY;
}
snprintf(rebuf, sizeof(rebuf), fmt, pattern);
errcode = regcomp(*regex, rebuf, (REG_EXTENDED|REG_NOSUB|REG_ICASE));
if (errcode)
{
size_t errlen = regerror(errcode, *regex, rebuf, sizeof(rebuf));
if (errlen > (sizeof(rebuf) - (size_t)1))
{
errlen = sizeof(rebuf) - (size_t)1;
}
rebuf[errlen] = '\0';
log_error(LOG_LEVEL_ERROR, "error compiling %s from %s: %s",
pattern, url->spec, rebuf);
free_url_spec(url);
return JB_ERR_PARSE;
}
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : compile_url_pattern
*
* Description : Compiles the three parts of an URL pattern.
*
* Parameters :
* 1 : url = Target url_spec to be filled in.
* 2 : buf = The url pattern to compile. Will be messed up.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_url_pattern(struct url_spec *url, char *buf)
{
char *p;
p = strchr(buf, '/');
if (NULL != p)
{
/*
* Only compile the regex if it consists of more than
* a single slash, otherwise it wouldn't affect the result.
*/
if (p[1] != '\0')
{
/*
* XXX: does it make sense to compile the slash at the beginning?
*/
jb_err err = compile_pattern(p, LEFT_ANCHORED, url, &url->preg);
if (JB_ERR_OK != err)
{
return err;
}
}
*p = '\0';
}
p = strchr(buf, ':');
if (NULL != p)
{
*p++ = '\0';
url->port_list = strdup(p);
if (NULL == url->port_list)
{
return JB_ERR_MEMORY;
}
}
else
{
url->port_list = NULL;
}
if (buf[0] != '\0')
{
return compile_host_pattern(url, buf);
}
return JB_ERR_OK;
}
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
/*********************************************************************
*
* Function : compile_host_pattern
*
* Description : Parses and compiles a host pattern..
*
* Parameters :
* 1 : url = Target url_spec to be filled in.
* 2 : host_pattern = Host pattern to compile.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_host_pattern(struct url_spec *url, const char *host_pattern)
{
return compile_pattern(host_pattern, RIGHT_ANCHORED, url, &url->host_regex);
}
#else
/*********************************************************************
*
* Function : compile_host_pattern
*
* Description : Parses and "compiles" an old-school host pattern.
*
* Parameters :
* 1 : url = Target url_spec to be filled in.
* 2 : host_pattern = Host pattern to parse.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex
*
*********************************************************************/
static jb_err compile_host_pattern(struct url_spec *url, const char *host_pattern)
{
char *v[150];
size_t size;
char *p;
/*
* Parse domain part
*/
if (host_pattern[strlen(host_pattern) - 1] == '.')
{
url->unanchored |= ANCHOR_RIGHT;
}
if (host_pattern[0] == '.')
{
url->unanchored |= ANCHOR_LEFT;
}
/*
* Split domain into components
*/
url->dbuffer = strdup(host_pattern);
if (NULL == url->dbuffer)
{
free_url_spec(url);
return JB_ERR_MEMORY;
}
/*
* Map to lower case
*/
for (p = url->dbuffer; *p ; p++)
{
*p = (char)tolower((int)(unsigned char)*p);
}
/*
* Split the domain name into components
*/
url->dcount = ssplit(url->dbuffer, ".", v, SZ(v), 1, 1);
if (url->dcount < 0)
{
free_url_spec(url);
return JB_ERR_MEMORY;
}
else if (url->dcount != 0)
{
/*
* Save a copy of the pointers in dvec
*/
size = (size_t)url->dcount * sizeof(*url->dvec);
url->dvec = (char **)malloc(size);
if (NULL == url->dvec)
{
free_url_spec(url);
return JB_ERR_MEMORY;
}
memcpy(url->dvec, v, size);
}
/*
* else dcount == 0 in which case we needn't do anything,
* since dvec will never be accessed and the pattern will
* match all domains.
*/
return JB_ERR_OK;
}
/*********************************************************************
*
* Function : simplematch
*
* Description : String matching, with a (greedy) '*' wildcard that
* stands for zero or more arbitrary characters and
* character classes in [], which take both enumerations
* and ranges.
*
* Parameters :
* 1 : pattern = pattern for matching
* 2 : text = text to be matched
*
* Returns : 0 if match, else nonzero
*
*********************************************************************/
static int simplematch(const char *pattern, const char *text)
{
const unsigned char *pat = (const unsigned char *)pattern;
const unsigned char *txt = (const unsigned char *)text;
const unsigned char *fallback = pat;
int wildcard = 0;
unsigned char lastchar = 'a';
unsigned i;
unsigned char charmap[32];
while (*txt)
{
/* EOF pattern but !EOF text? */
if (*pat == '\0')
{
if (wildcard)
{
pat = fallback;
}
else
{
return 1;
}
}
/* '*' in the pattern? */
if (*pat == '*')
{
/* The pattern ends afterwards? Speed up the return. */
if (*++pat == '\0')
{
return 0;
}
/* Else, set wildcard mode and remember position after '*' */
wildcard = 1;
fallback = pat;
}
/* Character range specification? */
if (*pat == '[')
{
memset(charmap, '\0', sizeof(charmap));
while (*++pat != ']')
{
if (!*pat)
{
return 1;
}
else if (*pat == '-')
{
if ((*++pat == ']') || *pat == '\0')
{
return(1);
}
for (i = lastchar; i <= *pat; i++)
{
charmap[i / 8] |= (unsigned char)(1 << (i % 8));
}
}
else
{
charmap[*pat / 8] |= (unsigned char)(1 << (*pat % 8));
lastchar = *pat;
}
}
} /* -END- if Character range specification */
/*
* Char match, or char range match?
*/
if ( (*pat == *txt)
|| (*pat == '?')
|| ((*pat == ']') && (charmap[*txt / 8] & (1 << (*txt % 8)))) )
{
/*
* Sucess: Go ahead
*/
pat++;
}
else if (!wildcard)
{
/*
* No match && no wildcard: No luck
*/
return 1;
}
else if (pat != fallback)
{
/*
* Increment text pointer if in char range matching
*/
if (*pat == ']')
{
txt++;
}
/*
* Wildcard mode && nonmatch beyond fallback: Rewind pattern
*/
pat = fallback;
/*
* Restart matching from current text pointer
*/
continue;
}
txt++;
}
/* Cut off extra '*'s */
if(*pat == '*') pat++;
/* If this is the pattern's end, fine! */
return(*pat);
}
/*********************************************************************
*
* Function : simple_domaincmp
*
* Description : Domain-wise Compare fqdn's. The comparison is
* both left- and right-anchored. The individual
* domain names are compared with simplematch().
* This is only used by domain_match.
*
* Parameters :
* 1 : pv = array of patterns to compare
* 2 : fv = array of domain components to compare
* 3 : len = length of the arrays (both arrays are the
* same length - if they weren't, it couldn't
* possibly be a match).
*
* Returns : 0 => domains are equivalent, else no match.
*
*********************************************************************/
static int simple_domaincmp(char **pv, char **fv, int len)
{
int n;
for (n = 0; n < len; n++)
{
if (simplematch(pv[n], fv[n]))
{
return 1;
}
}
return 0;
}
/*********************************************************************
*
* Function : domain_match
*
* Description : Domain-wise Compare fqdn's. Governed by the bimap in
* pattern->unachored, the comparison is un-, left-,
* right-anchored, or both.
* The individual domain names are compared with
* simplematch().
*
* Parameters :
* 1 : pattern = a domain that may contain a '*' as a wildcard.
* 2 : fqdn = domain name against which the patterns are compared.
*
* Returns : 0 => domains are equivalent, else no match.
*
*********************************************************************/
static int domain_match(const struct url_spec *pattern, const struct http_request *fqdn)
{
char **pv, **fv; /* vectors */
int plen, flen;
int unanchored = pattern->unanchored & (ANCHOR_RIGHT | ANCHOR_LEFT);
plen = pattern->dcount;
flen = fqdn->dcount;
if (flen < plen)
{
/* fqdn is too short to match this pattern */
return 1;
}
pv = pattern->dvec;
fv = fqdn->dvec;
if (unanchored == ANCHOR_LEFT)
{
/*
* Right anchored.
*
* Convert this into a fully anchored pattern with
* the fqdn and pattern the same length
*/
fv += (flen - plen); /* flen - plen >= 0 due to check above */
return simple_domaincmp(pv, fv, plen);
}
else if (unanchored == 0)
{
/* Fully anchored, check length */
if (flen != plen)
{
return 1;
}
return simple_domaincmp(pv, fv, plen);
}
else if (unanchored == ANCHOR_RIGHT)
{
/* Left anchored, ignore all extra in fqdn */
return simple_domaincmp(pv, fv, plen);
}
else
{
/* Unanchored */
int n;
int maxn = flen - plen;
for (n = 0; n <= maxn; n++)
{
if (!simple_domaincmp(pv, fv, plen))
{
return 0;
}
/*
* Doesn't match from start of fqdn
* Try skipping first part of fqdn
*/
fv++;
}
return 1;
}
}
#endif /* def FEATURE_EXTENDED_HOST_PATTERNS */
/*********************************************************************
*
* Function : create_url_spec
*
* Description : Creates a "url_spec" structure from a string.
* When finished, free with free_url_spec().
*
* Parameters :
* 1 : url = Target url_spec to be filled in. Will be
* zeroed before use.
* 2 : buf = Source pattern, null terminated. NOTE: The
* contents of this buffer are destroyed by this
* function. If this function succeeds, the
* buffer is copied to url->spec. If this
* function fails, the contents of the buffer
* are lost forever.
*
* Returns : JB_ERR_OK - Success
* JB_ERR_MEMORY - Out of memory
* JB_ERR_PARSE - Cannot parse regex (Detailed message
* written to system log)
*
*********************************************************************/
jb_err create_url_spec(struct url_spec *url, char *buf)
{
assert(url);
assert(buf);
memset(url, '\0', sizeof(*url));
/* Remember the original specification for the CGI pages. */
url->spec = strdup(buf);
if (NULL == url->spec)
{
return JB_ERR_MEMORY;
}
/* Is it tag pattern? */
if (0 == strncmpic("TAG:", url->spec, 4))
{
/* The pattern starts with the first character after "TAG:" */
const char *tag_pattern = buf + 4;
return compile_pattern(tag_pattern, NO_ANCHORING, url, &url->tag_regex);
}
/* If it isn't a tag pattern it must be a URL pattern. */
return compile_url_pattern(url, buf);
}
/*********************************************************************
*
* Function : free_url_spec
*
* Description : Called from the "unloaders". Freez the url
* structure elements.
*
* Parameters :
* 1 : url = pointer to a url_spec structure.
*
* Returns : N/A
*
*********************************************************************/
void free_url_spec(struct url_spec *url)
{
if (url == NULL) return;
freez(url->spec);
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
if (url->host_regex)
{
regfree(url->host_regex);
freez(url->host_regex);
}
#else
freez(url->dbuffer);
freez(url->dvec);
url->dcount = 0;
#endif /* ndef FEATURE_EXTENDED_HOST_PATTERNS */
freez(url->port_list);
if (url->preg)
{
regfree(url->preg);
freez(url->preg);
}
if (url->tag_regex)
{
regfree(url->tag_regex);
freez(url->tag_regex);
}
}
/*********************************************************************
*
* Function : url_match
*
* Description : Compare a URL against a URL pattern.
*
* Parameters :
* 1 : pattern = a URL pattern
* 2 : url = URL to match
*
* Returns : Nonzero if the URL matches the pattern, else 0.
*
*********************************************************************/
int url_match(const struct url_spec *pattern,
const struct http_request *http)
{
/* XXX: these should probably be functions. */
#define PORT_MATCHES ((NULL == pattern->port_list) || match_portlist(pattern->port_list, http->port))
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
#define DOMAIN_MATCHES ((NULL == pattern->host_regex) || (0 == regexec(pattern->host_regex, http->host, 0, NULL, 0)))
#else
#define DOMAIN_MATCHES ((NULL == pattern->dbuffer) || (0 == domain_match(pattern, http)))
#endif
#define PATH_MATCHES ((NULL == pattern->preg) || (0 == regexec(pattern->preg, http->path, 0, NULL, 0)))
if (pattern->tag_regex != NULL)
{
/* It's a tag pattern and shouldn't be matched against URLs */
return 0;
}
return (PORT_MATCHES && DOMAIN_MATCHES && PATH_MATCHES);
}
/*********************************************************************
*
* Function : match_portlist
*
* Description : Check if a given number is covered by a comma
* separated list of numbers and ranges (a,b-c,d,..)
*
* Parameters :
* 1 : portlist = String with list
* 2 : port = port to check
*
* Returns : 0 => no match
* 1 => match
*
*********************************************************************/
int match_portlist(const char *portlist, int port)
{
char *min, *max, *next, *portlist_copy;
min = next = portlist_copy = strdup(portlist);
/*
* Zero-terminate first item and remember offset for next
*/
if (NULL != (next = strchr(portlist_copy, (int) ',')))
{
*next++ = '\0';
}
/*
* Loop through all items, checking for match
*/
while(min)
{
if (NULL == (max = strchr(min, (int) '-')))
{
/*
* No dash, check for equality
*/
if (port == atoi(min))
{
freez(portlist_copy);
return(1);
}
}
else
{
/*
* This is a range, so check if between min and max,
* or, if max was omitted, between min and 65K
*/
*max++ = '\0';
if(port >= atoi(min) && port <= (atoi(max) ? atoi(max) : 65535))
{
freez(portlist_copy);
return(1);
}
}
/*
* Jump to next item
*/
min = next;
/*
* Zero-terminate next item and remember offset for n+1
*/
if ((NULL != next) && (NULL != (next = strchr(next, (int) ','))))
{
*next++ = '\0';
}
}
freez(portlist_copy);
return 0;
}
/*
Local Variables:
tab-width: 3
end:
*/