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urlmatch.c
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urlmatch.c
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const char urlmatch_rcs[] = "$Id: urlmatch.c,v 1.10.2.7 2003/05/17 15:57:24 oes Exp $";
/*********************************************************************
*
* File : $Source: /cvsroot/ijbswa/current/Attic/urlmatch.c,v $
*
* Purpose : Declares functions to match URLs against URL
* patterns.
*
* Copyright : Written by and Copyright (C) 2001 the SourceForge
* Privoxy team. http://www.privoxy.org/
*
* Based on the Internet Junkbuster originally written
* by and Copyright (C) 1997 Anonymous Coders and
* Junkbusters Corporation. http://www.junkbusters.com
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public
* License for more details.
*
* The GNU General Public License should be included with
* this file. If not, you can view it at
* http://www.gnu.org/copyleft/gpl.html
* or write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Revisions :
* $Log: urlmatch.c,v $
* 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;
/*********************************************************************
*
* 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 : 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.
* Will be zeroed before use. Note that this
* function sets the http->gpc and http->ver
* members to NULL.
* 3 : csp = Current client state (buffers, headers, etc...)
*
* 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,
struct client_state *csp)
{
/*
* Zero out the results structure
*/
memset(http, '\0', sizeof(*http));
/*
* 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;
http->ssl = 0;
}
else if (strncmpic(url_noproto, "https://", 8) == 0)
{
url_noproto += 8;
http->ssl = 1;
}
else
{
http->ssl = 0;
}
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;
}
}
/*
* 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);
free(buf);
if (http->host == NULL)
{
return JB_ERR_MEMORY;
}
}
/*
* Split domain name so we can compare it against wildcards
*/
{
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 = 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
*/
return JB_ERR_PARSE;
}
/* save a copy of the pointers in dvec */
size = 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_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
* 3 : csp = Current client state (buffers, headers, etc...)
*
* 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,
struct client_state *csp)
{
char *buf;
char *v[10];
int n;
jb_err err;
int is_connect = 0;
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)
{
free(buf);
return JB_ERR_PARSE;
}
/* this could be a CONNECT request */
if (strcmpic(v[0], "connect") == 0)
{
/* Secure */
is_connect = 1;
}
/* or it could be any other basic HTTP request type */
else 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"))
|| (0 == strcmpic(v[0], "options"))
|| (0 == strcmpic(v[0], "trace"))
/* 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"))
/* Or a 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 */
|| (0 == strcmpic(v[0], "bcopy"))
|| (0 == strcmpic(v[0], "bmove"))
|| (0 == strcmpic(v[0], "bdelete"))
|| (0 == strcmpic(v[0], "bpropfind"))
|| (0 == strcmpic(v[0], "bproppatch"))
/* Or 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 */
|| (0 == strcmpic(v[0], "subscribe"))
|| (0 == strcmpic(v[0], "unsubscribe"))
|| (0 == strcmpic(v[0], "notify"))
|| (0 == strcmpic(v[0], "poll"))
)
{
/* Normal */
is_connect = 0;
}
else
{
/* Unknown HTTP method */
free(buf);
return JB_ERR_PARSE;
}
err = parse_http_url(v[1], http, csp);
if (err)
{
free(buf);
return err;
}
/*
* Copy the details into the structure
*/
http->ssl = is_connect;
http->cmd = strdup(req);
http->gpc = strdup(v[0]);
http->ver = strdup(v[2]);
if ( (http->cmd == NULL)
|| (http->gpc == NULL)
|| (http->ver == NULL) )
{
free(buf);
return JB_ERR_MEMORY;
}
free(buf);
return JB_ERR_OK;
}
/*********************************************************************
*
* 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;
}
}
/*********************************************************************
*
* 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, const char * buf)
{
char *p;
assert(url);
assert(buf);
/*
* Zero memory
*/
memset(url, '\0', sizeof(*url));
/*
* Save a copy of the orignal specification
*/
if ((url->spec = strdup(buf)) == NULL)
{
return JB_ERR_MEMORY;
}
if ((p = strchr(buf, '/')) != NULL)
{
if (NULL == (url->path = strdup(p)))
{
freez(url->spec);
return JB_ERR_MEMORY;
}
url->pathlen = strlen(url->path);
*p = '\0';
}
else
{
url->path = NULL;
url->pathlen = 0;
}
if (url->path)
{
int errcode;
char rebuf[BUFFER_SIZE];
if (NULL == (url->preg = zalloc(sizeof(*url->preg))))
{
freez(url->spec);
freez(url->path);
return JB_ERR_MEMORY;
}
sprintf(rebuf, "^(%s)", url->path);
errcode = regcomp(url->preg, rebuf,
(REG_EXTENDED|REG_NOSUB|REG_ICASE));
if (errcode)
{
size_t errlen = regerror(errcode,
url->preg, 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: %s",
url->spec, rebuf);
freez(url->spec);
freez(url->path);
regfree(url->preg);
freez(url->preg);
return JB_ERR_PARSE;
}
}
if ((p = strchr(buf, ':')) == NULL)
{
url->port = 0;
}
else
{
*p++ = '\0';
url->port = atoi(p);
}
if (buf[0] != '\0')
{
char *v[150];
size_t size;
/*
* Parse domain part
*/
if (buf[strlen(buf) - 1] == '.')
{
url->unanchored |= ANCHOR_RIGHT;
}
if (buf[0] == '.')
{
url->unanchored |= ANCHOR_LEFT;
}
/*
* Split domain into components
*/
url->dbuffer = strdup(buf);
if (NULL == url->dbuffer)
{
freez(url->spec);
freez(url->path);
regfree(url->preg);
freez(url->preg);
return JB_ERR_MEMORY;
}
/*
* Map to lower case
*/
for (p = url->dbuffer; *p ; p++)
{
*p = 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)
{
freez(url->spec);
freez(url->path);
regfree(url->preg);
freez(url->preg);
freez(url->dbuffer);
url->dcount = 0;
return JB_ERR_MEMORY;
}
else if (url->dcount != 0)
{
/*
* Save a copy of the pointers in dvec
*/
size = url->dcount * sizeof(*url->dvec);
url->dvec = (char **)malloc(size);
if (NULL == url->dvec)
{
freez(url->spec);
freez(url->path);
regfree(url->preg);
freez(url->preg);
freez(url->dbuffer);
url->dcount = 0;
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 : 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);
freez(url->dbuffer);
freez(url->dvec);
freez(url->path);
if (url->preg)
{
regfree(url->preg);
freez(url->preg);
}
}
/*********************************************************************
*
* Function : url_match
*
* Description : Compare a URL against a URL pattern.
*
* Parameters :
* 1 : pattern = a URL pattern
* 2 : url = URL to match
*
* Returns : 0 iff the URL matches the pattern, else nonzero.
*
*********************************************************************/
int url_match(const struct url_spec *pattern,
const struct http_request *url)
{
return ((pattern->port == 0) || (pattern->port == url->port))
&& ((pattern->dbuffer == NULL) || (domain_match(pattern, url) == 0))
&& ((pattern->path == NULL) ||
(regexec(pattern->preg, url->path, 0, NULL, 0) == 0)
);
}
/*
Local Variables:
tab-width: 3
end:
*/