1463 lines
38 KiB
C
1463 lines
38 KiB
C
const char urlmatch_rcs[] = "$Id: urlmatch.c,v 1.65 2011/11/06 11:41:34 fabiankeil Exp $";
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/*********************************************************************
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*
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* File : $Source: /cvsroot/ijbswa/current/urlmatch.c,v $
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*
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* Purpose : Declares functions to match URLs against URL
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* patterns.
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*
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* Copyright : Written by and Copyright (C) 2001-2011
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* the Privoxy team. http://www.privoxy.org/
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*
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* Based on the Internet Junkbuster originally written
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* by and Copyright (C) 1997 Anonymous Coders and
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* Junkbusters Corporation. http://www.junkbusters.com
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will
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* be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU General Public
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* License for more details.
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*
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* The GNU General Public License should be included with
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* this file. If not, you can view it at
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* http://www.gnu.org/copyleft/gpl.html
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* or write to the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*********************************************************************/
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#include "config.h"
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#ifndef _WIN32
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#include <stdio.h>
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#include <sys/types.h>
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#endif
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#include <stdlib.h>
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#include <ctype.h>
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#include <assert.h>
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#include <string.h>
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#if !defined(_WIN32) && !defined(__OS2__)
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#include <unistd.h>
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#endif
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#include "project.h"
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#include "urlmatch.h"
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#include "ssplit.h"
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#include "miscutil.h"
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#include "errlog.h"
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const char urlmatch_h_rcs[] = URLMATCH_H_VERSION;
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enum regex_anchoring
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{
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NO_ANCHORING,
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LEFT_ANCHORED,
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RIGHT_ANCHORED,
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RIGHT_ANCHORED_HOST
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};
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static jb_err compile_host_pattern(struct url_spec *url, const char *host_pattern);
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/*********************************************************************
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*
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* Function : free_http_request
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*
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* Description : Freez a http_request structure
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*
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* Parameters :
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* 1 : http = points to a http_request structure to free
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*
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* Returns : N/A
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*
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*********************************************************************/
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void free_http_request(struct http_request *http)
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{
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assert(http);
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freez(http->cmd);
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freez(http->ocmd);
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freez(http->gpc);
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freez(http->host);
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freez(http->url);
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freez(http->hostport);
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freez(http->path);
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freez(http->ver);
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freez(http->host_ip_addr_str);
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#ifndef FEATURE_EXTENDED_HOST_PATTERNS
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freez(http->dbuffer);
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freez(http->dvec);
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http->dcount = 0;
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#endif
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}
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#ifndef FEATURE_EXTENDED_HOST_PATTERNS
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/*********************************************************************
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*
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* Function : init_domain_components
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*
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* Description : Splits the domain name so we can compare it
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* against wildcards. It used to be part of
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* parse_http_url, but was separated because the
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* same code is required in chat in case of
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* intercepted requests.
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*
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* Parameters :
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* 1 : http = pointer to the http structure to hold elements.
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*
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* Returns : JB_ERR_OK on success
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* JB_ERR_MEMORY on out of memory
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* JB_ERR_PARSE on malformed command/URL
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* or >100 domains deep.
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*
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*********************************************************************/
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jb_err init_domain_components(struct http_request *http)
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{
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char *vec[BUFFER_SIZE];
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size_t size;
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char *p;
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http->dbuffer = strdup(http->host);
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if (NULL == http->dbuffer)
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{
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return JB_ERR_MEMORY;
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}
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/* map to lower case */
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for (p = http->dbuffer; *p ; p++)
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{
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*p = (char)tolower((int)(unsigned char)*p);
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}
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/* split the domain name into components */
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http->dcount = ssplit(http->dbuffer, ".", vec, SZ(vec), 1, 1);
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if (http->dcount <= 0)
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{
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/*
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* Error: More than SZ(vec) components in domain
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* or: no components in domain
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*/
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log_error(LOG_LEVEL_ERROR, "More than SZ(vec) components in domain or none at all.");
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return JB_ERR_PARSE;
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}
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/* save a copy of the pointers in dvec */
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size = (size_t)http->dcount * sizeof(*http->dvec);
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http->dvec = (char **)malloc(size);
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if (NULL == http->dvec)
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{
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return JB_ERR_MEMORY;
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}
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memcpy(http->dvec, vec, size);
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return JB_ERR_OK;
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}
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#endif /* ndef FEATURE_EXTENDED_HOST_PATTERNS */
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/*********************************************************************
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*
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* Function : url_requires_percent_encoding
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*
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* Description : Checks if an URL contains invalid characters
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* according to RFC 3986 that should be percent-encoded.
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* Does not verify whether or not the passed string
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* actually is a valid URL.
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*
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* Parameters :
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* 1 : url = URL to check
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*
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* Returns : True in case of valid URLs, false otherwise
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*
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*********************************************************************/
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int url_requires_percent_encoding(const char *url)
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{
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static const char allowed_characters[128] = {
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'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
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'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
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'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
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'\0', '\0', '\0', '!', '\0', '#', '$', '%', '&', '\'',
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'(', ')', '*', '+', ',', '-', '.', '/', '0', '1',
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'2', '3', '4', '5', '6', '7', '8', '9', ':', ';',
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'\0', '=', '\0', '?', '@', 'A', 'B', 'C', 'D', 'E',
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'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y',
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'Z', '[', '\0', ']', '\0', '_', '\0', 'a', 'b', 'c',
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'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
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'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
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'x', 'y', 'z', '\0', '\0', '\0', '~', '\0'
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};
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while (*url != '\0')
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{
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const unsigned int i = (unsigned char)*url++;
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if (i >= sizeof(allowed_characters) || '\0' == allowed_characters[i])
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{
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return TRUE;
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}
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}
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return FALSE;
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}
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/*********************************************************************
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*
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* Function : parse_http_url
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*
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* Description : Parse out the host and port from the URL. Find the
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* hostname & path, port (if ':'), and/or password (if '@')
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*
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* Parameters :
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* 1 : url = URL (or is it URI?) to break down
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* 2 : http = pointer to the http structure to hold elements.
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* Must be initialized with valid values (like NULLs).
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* 3 : require_protocol = Whether or not URLs without
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* protocol are acceptable.
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*
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* Returns : JB_ERR_OK on success
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* JB_ERR_MEMORY on out of memory
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* JB_ERR_PARSE on malformed command/URL
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* or >100 domains deep.
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*
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*********************************************************************/
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jb_err parse_http_url(const char *url, struct http_request *http, int require_protocol)
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{
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int host_available = 1; /* A proxy can dream. */
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/*
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* Save our initial URL
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*/
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http->url = strdup(url);
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if (http->url == NULL)
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{
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return JB_ERR_MEMORY;
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}
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/*
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* Check for * URI. If found, we're done.
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*/
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if (*http->url == '*')
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{
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if ( NULL == (http->path = strdup("*"))
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|| NULL == (http->hostport = strdup("")) )
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{
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return JB_ERR_MEMORY;
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}
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if (http->url[1] != '\0')
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{
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return JB_ERR_PARSE;
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}
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return JB_ERR_OK;
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}
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/*
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* Split URL into protocol,hostport,path.
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*/
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{
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char *buf;
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char *url_noproto;
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char *url_path;
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buf = strdup(url);
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if (buf == NULL)
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{
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return JB_ERR_MEMORY;
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}
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/* Find the start of the URL in our scratch space */
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url_noproto = buf;
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if (strncmpic(url_noproto, "http://", 7) == 0)
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{
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url_noproto += 7;
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}
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else if (strncmpic(url_noproto, "https://", 8) == 0)
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{
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/*
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* Should only happen when called from cgi_show_url_info().
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*/
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url_noproto += 8;
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http->ssl = 1;
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}
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else if (*url_noproto == '/')
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{
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/*
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* Short request line without protocol and host.
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* Most likely because the client's request
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* was intercepted and redirected into Privoxy.
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*/
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http->host = NULL;
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host_available = 0;
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}
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else if (require_protocol)
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{
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freez(buf);
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return JB_ERR_PARSE;
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}
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url_path = strchr(url_noproto, '/');
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if (url_path != NULL)
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{
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/*
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* Got a path.
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*
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* NOTE: The following line ignores the path for HTTPS URLS.
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* This means that you get consistent behaviour if you type a
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* https URL in and it's parsed by the function. (When the
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* URL is actually retrieved, SSL hides the path part).
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*/
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http->path = strdup(http->ssl ? "/" : url_path);
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*url_path = '\0';
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http->hostport = strdup(url_noproto);
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}
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else
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{
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/*
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* Repair broken HTTP requests that don't contain a path,
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* or CONNECT requests
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*/
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http->path = strdup("/");
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http->hostport = strdup(url_noproto);
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}
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freez(buf);
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if ( (http->path == NULL)
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|| (http->hostport == NULL))
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{
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return JB_ERR_MEMORY;
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}
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}
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if (!host_available)
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{
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/* Without host, there is nothing left to do here */
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return JB_ERR_OK;
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}
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/*
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* Split hostport into user/password (ignored), host, port.
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*/
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{
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char *buf;
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char *host;
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char *port;
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buf = strdup(http->hostport);
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if (buf == NULL)
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{
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return JB_ERR_MEMORY;
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}
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/* check if url contains username and/or password */
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host = strchr(buf, '@');
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if (host != NULL)
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{
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/* Contains username/password, skip it and the @ sign. */
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host++;
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}
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else
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{
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/* No username or password. */
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host = buf;
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}
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/* Move after hostname before port number */
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if (*host == '[')
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{
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/* Numeric IPv6 address delimited by brackets */
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host++;
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port = strchr(host, ']');
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if (port == NULL)
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{
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/* Missing closing bracket */
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freez(buf);
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return JB_ERR_PARSE;
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}
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*port++ = '\0';
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if (*port == '\0')
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{
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port = NULL;
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}
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else if (*port != ':')
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{
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/* Garbage after closing bracket */
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freez(buf);
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return JB_ERR_PARSE;
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}
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}
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else
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{
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/* Plain non-escaped hostname */
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port = strchr(host, ':');
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}
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/* check if url contains port */
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if (port != NULL)
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{
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/* Contains port */
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/* Terminate hostname and point to start of port string */
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*port++ = '\0';
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http->port = atoi(port);
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}
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else
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{
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/* No port specified. */
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http->port = (http->ssl ? 443 : 80);
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}
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http->host = strdup(host);
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freez(buf);
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if (http->host == NULL)
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{
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return JB_ERR_MEMORY;
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}
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}
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#ifdef FEATURE_EXTENDED_HOST_PATTERNS
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return JB_ERR_OK;
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#else
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/* Split domain name so we can compare it against wildcards */
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return init_domain_components(http);
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#endif /* def FEATURE_EXTENDED_HOST_PATTERNS */
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}
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/*********************************************************************
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*
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* Function : unknown_method
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*
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* Description : Checks whether a method is unknown.
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*
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* Parameters :
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* 1 : method = points to a http method
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*
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* Returns : TRUE if it's unknown, FALSE otherwise.
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*
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*********************************************************************/
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static int unknown_method(const char *method)
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{
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static const char * const known_http_methods[] = {
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/* Basic HTTP request type */
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"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS", "TRACE", "CONNECT",
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/* webDAV extensions (RFC2518) */
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"PROPFIND", "PROPPATCH", "MOVE", "COPY", "MKCOL", "LOCK", "UNLOCK",
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/*
|
|
* Microsoft webDAV extension for Exchange 2000. See:
|
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* http://lists.w3.org/Archives/Public/w3c-dist-auth/2002JanMar/0001.html
|
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* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
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*/
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"BCOPY", "BMOVE", "BDELETE", "BPROPFIND", "BPROPPATCH",
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/*
|
|
* Another Microsoft webDAV extension for Exchange 2000. See:
|
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* 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
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* http://msdn.microsoft.com/library/en-us/wss/wss/_webdav_methods.asp
|
|
*/
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|
"SUBSCRIBE", "UNSUBSCRIBE", "NOTIFY", "POLL",
|
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/*
|
|
* Yet another WebDAV extension, this time for
|
|
* Web Distributed Authoring and Versioning (RFC3253)
|
|
*/
|
|
"VERSION-CONTROL", "REPORT", "CHECKOUT", "CHECKIN", "UNCHECKOUT",
|
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"MKWORKSPACE", "UPDATE", "LABEL", "MERGE", "BASELINE-CONTROL", "MKACTIVITY",
|
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};
|
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int i;
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|
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for (i = 0; i < SZ(known_http_methods); i++)
|
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{
|
|
if (0 == strcmpic(method, known_http_methods[i]))
|
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{
|
|
return FALSE;
|
|
}
|
|
}
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|
|
|
return TRUE;
|
|
|
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}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* 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;
|
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|
|
memset(http, '\0', sizeof(*http));
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|
|
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 modified
|
|
* before compilation. Can be either
|
|
* one of NO_ANCHORING, LEFT_ANCHORED,
|
|
* RIGHT_ANCHORED or RIGHT_ANCHORED_HOST.
|
|
* 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 RIGHT_ANCHORED_HOST:
|
|
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';
|
|
}
|
|
|
|
/*
|
|
* IPv6 numeric hostnames can contain colons, thus we need
|
|
* to delimit the hostname before the real port separator.
|
|
* As brackets are already used in the hostname pattern,
|
|
* we use angle brackets ('<', '>') instead.
|
|
*/
|
|
if ((buf[0] == '<') && (NULL != (p = strchr(buf + 1, '>'))))
|
|
{
|
|
*p++ = '\0';
|
|
buf++;
|
|
|
|
if (*p == '\0')
|
|
{
|
|
/* IPv6 address without port number */
|
|
p = NULL;
|
|
}
|
|
else if (*p != ':')
|
|
{
|
|
/* Garbage after address delimiter */
|
|
return JB_ERR_PARSE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
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_HOST, 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)))) )
|
|
{
|
|
/*
|
|
* Success: 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 a tag pattern? */
|
|
if (0 == strncmpic(url->spec, "TAG:", 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 an 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 : port_matches
|
|
*
|
|
* Description : Compares a port against a port list.
|
|
*
|
|
* Parameters :
|
|
* 1 : port = The port to check.
|
|
* 2 : port_list = The list of port to compare with.
|
|
*
|
|
* Returns : TRUE for yes, FALSE otherwise.
|
|
*
|
|
*********************************************************************/
|
|
static int port_matches(const int port, const char *port_list)
|
|
{
|
|
return ((NULL == port_list) || match_portlist(port_list, port));
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : host_matches
|
|
*
|
|
* Description : Compares a host against a host pattern.
|
|
*
|
|
* Parameters :
|
|
* 1 : url = The URL to match
|
|
* 2 : pattern = The URL pattern
|
|
*
|
|
* Returns : TRUE for yes, FALSE otherwise.
|
|
*
|
|
*********************************************************************/
|
|
static int host_matches(const struct http_request *http,
|
|
const struct url_spec *pattern)
|
|
{
|
|
#ifdef FEATURE_EXTENDED_HOST_PATTERNS
|
|
return ((NULL == pattern->host_regex)
|
|
|| (0 == regexec(pattern->host_regex, http->host, 0, NULL, 0)));
|
|
#else
|
|
return ((NULL == pattern->dbuffer) || (0 == domain_match(pattern, http)));
|
|
#endif
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : path_matches
|
|
*
|
|
* Description : Compares a path against a path pattern.
|
|
*
|
|
* Parameters :
|
|
* 1 : path = The path to match
|
|
* 2 : pattern = The URL pattern
|
|
*
|
|
* Returns : TRUE for yes, FALSE otherwise.
|
|
*
|
|
*********************************************************************/
|
|
static int path_matches(const char *path, const struct url_spec *pattern)
|
|
{
|
|
return ((NULL == pattern->preg)
|
|
|| (0 == regexec(pattern->preg, path, 0, NULL, 0)));
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* 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)
|
|
{
|
|
if (pattern->tag_regex != NULL)
|
|
{
|
|
/* It's a tag pattern and shouldn't be matched against URLs */
|
|
return 0;
|
|
}
|
|
|
|
return (port_matches(http->port, pattern->port_list)
|
|
&& host_matches(http, pattern) && path_matches(http->path, pattern));
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* 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 = 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 (NULL != 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;
|
|
|
|
}
|
|
|
|
|
|
/*********************************************************************
|
|
*
|
|
* Function : parse_forwarder_address
|
|
*
|
|
* Description : Parse out the host and port from a forwarder address.
|
|
*
|
|
* Parameters :
|
|
* 1 : address = The forwarder address to parse.
|
|
* 2 : hostname = Used to return the hostname. NULL on error.
|
|
* 3 : port = Used to return the port. Untouched if no port
|
|
* is specified.
|
|
*
|
|
* Returns : JB_ERR_OK on success
|
|
* JB_ERR_MEMORY on out of memory
|
|
* JB_ERR_PARSE on malformed address.
|
|
*
|
|
*********************************************************************/
|
|
jb_err parse_forwarder_address(char *address, char **hostname, int *port)
|
|
{
|
|
char *p = address;
|
|
|
|
if ((*address == '[') && (NULL == strchr(address, ']')))
|
|
{
|
|
/* XXX: Should do some more validity checks here. */
|
|
return JB_ERR_PARSE;
|
|
}
|
|
|
|
*hostname = strdup(address);
|
|
if (NULL == *hostname)
|
|
{
|
|
return JB_ERR_MEMORY;
|
|
}
|
|
|
|
if ((**hostname == '[') && (NULL != (p = strchr(*hostname, ']'))))
|
|
{
|
|
*p++ = '\0';
|
|
memmove(*hostname, (*hostname + 1), (size_t)(p - *hostname));
|
|
if (*p == ':')
|
|
{
|
|
*port = (int)strtol(++p, NULL, 0);
|
|
}
|
|
}
|
|
else if (NULL != (p = strchr(*hostname, ':')))
|
|
{
|
|
*p++ = '\0';
|
|
*port = (int)strtol(p, NULL, 0);
|
|
}
|
|
|
|
return JB_ERR_OK;
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
Local Variables:
|
|
tab-width: 3
|
|
end:
|
|
*/
|