+++ /dev/null
-const char filters_rcs[] = "$Id: filters.c,v 1.3 2001/05/20 16:44:47 jongfoster Exp $";
-/*********************************************************************
- *
- * File : $Source: /cvsroot/ijbswa/current/filters.c,v $
- *
- * Purpose : Declares functions to parse/crunch headers and pages.
- * Functions declared include:
- * `acl_addr', `add_stats', `block_acl', `block_imageurl',
- * `block_url', `url_permissions', `domaincmp', `dsplit',
- * `filter_popups', `forward_url', 'redirect_url',
- * `ij_untrusted_url', `intercept_url', `re_process_buffer',
- * `show_proxy_args', 'ijb_send_banner', and `trust_url'
- *
- * Copyright : Written by and Copyright (C) 2001 the SourceForge
- * IJBSWA team. http://ijbswa.sourceforge.net
- *
- * 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: filters.c,v $
- * Revision 1.3 2001/05/20 16:44:47 jongfoster
- * Removing last hardcoded JunkBusters.com URLs.
- *
- * Revision 1.2 2001/05/20 01:21:20 jongfoster
- * Version 2.9.4 checkin.
- * - Merged popupfile and cookiefile, and added control over PCRS
- * filtering, in new "permissionsfile".
- * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
- * file error you now get a message box (in the Win32 GUI) rather
- * than the program exiting with no explanation.
- * - Made killpopup use the PCRS MIME-type checking and HTTP-header
- * skipping.
- * - Removed tabs from "config"
- * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
- * - Bumped up version number.
- *
- * Revision 1.1.1.1 2001/05/15 13:58:52 oes
- * Initial import of version 2.9.3 source tree
- *
- *
- *********************************************************************/
-\f
-
-#include "config.h"
-
-#include <stdio.h>
-#include <sys/types.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <string.h>
-
-#ifndef _WIN32
-#include <unistd.h>
-#include <netinet/in.h>
-#else
-#include <winsock2.h>
-#endif
-
-#include "project.h"
-#include "filters.h"
-#include "encode.h"
-#include "jcc.h"
-#include "showargs.h"
-#include "parsers.h"
-#include "ssplit.h"
-#include "gateway.h"
-#include "jbsockets.h"
-#include "errlog.h"
-#include "jbsockets.h"
-
-#ifdef _WIN32
-#include "win32.h"
-#endif
-
-const char filters_h_rcs[] = FILTERS_H_VERSION;
-
-/* Fix a problem with Solaris. There should be no effect on other
- * platforms.
- * Solaris's isspace() is a macro which uses it's argument directly
- * as an array index. Therefore we need to make sure that high-bit
- * characters generate +ve values, and ideally we also want to make
- * the argument match the declared parameter type of "int".
- */
-#define ijb_isdigit(__X) isdigit((int)(unsigned char)(__X))
-
-
-static const char CBLOCK[] =
-#ifdef AMIGA
- "HTTP/1.0 403 Request for blocked URL\n"
-#else /* ifndef AMIGA */
- "HTTP/1.0 202 Request for blocked URL\n"
-#endif /* ndef AMIGA */
- "Pragma: no-cache\n"
- "Last-Modified: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Expires: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Content-Type: text/html\n\n"
- "<html>\n"
- "<head>\n"
- "<title>Internet Junkbuster: Request for blocked URL</title>\n"
- "</head>\n"
- WHITEBG
- "<center><h1>"
- BANNER
- "</h1></center>\n"
- "<p align=center>Your request for <b>%s%s</b><br>\n"
- "was blocked because it matches the following pattern "
- "in the blockfile: <b>%s</b>\n</p>"
-#ifdef FORCE_LOAD
- "<p align=center><a href=\"http://%s" FORCE_PREFIX
- "%s\">Go there anyway.</a></p>"
-#endif /* def FORCE_LOAD */
- "</body>\n"
- "</html>\n";
-
-#ifdef TRUST_FILES
-static const char CTRUST[] =
-#ifdef AMIGA
- "HTTP/1.0 403 Request for untrusted URL\n"
-#else /* ifndef AMIGA */
- "HTTP/1.0 202 Request for untrusted URL\n"
-#endif /* ndef AMIGA */
- "Pragma: no-cache\n"
- "Last-Modified: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Expires: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Content-Type: text/html\n\n"
- "<html>\n"
- "<head>\n"
- "<title>Internet Junkbuster: Request for untrusted URL</title>\n"
- "</head>\n"
- WHITEBG
- "<center>"
- "<a href=http://internet.junkbuster.com/ij-untrusted-url?%s+%s+%s>"
- BANNER
- "</a>"
- "</center>"
- "</body>\n"
- "</html>\n";
-#endif /* def TRUST_FILES */
-
-
-#ifdef ACL_FILES
-/*********************************************************************
- *
- * Function : block_acl
- *
- * Description : Block this request?
- * Decide yes or no based on ACL file.
- *
- * Parameters :
- * 1 : src = Address the browser/user agent is requesting.
- * 2 : dst = The proxy or gateway address this is going to.
- * 3 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : 0 = FALSE (don't block) and 1 = TRUE (do block)
- *
- *********************************************************************/
-int block_acl(struct access_control_addr *src, struct access_control_addr *dst, struct client_state *csp)
-{
- struct file_list *fl;
- struct access_control_list *a, *acl;
- struct access_control_addr s[1], d[1];
-
- /* if not using an access control list, then permit the connection */
- if (((fl = csp->alist) == NULL) || ((acl = fl->f) == NULL))
- {
- return(0);
- }
-
- /* search the list */
- for (a = acl->next ; a ; a = a->next)
- {
- *s = *src;
- *d = *dst;
-
- s->addr &= a->src->mask;
- d->addr &= a->dst->mask;
-
- if ((s->addr == a->src->addr)
- && (d->addr == a->dst->addr)
- && ((s->port == a->src->port)
- || (s->port == 0)
- || (a->src->port == 0))
- && ((d->port == a->dst->port)
- || (d->port == 0)
- || (a->dst->port == 0)))
- {
- if (a->action == ACL_PERMIT)
- {
- return(0);
- }
- else
- {
- return(1);
- }
- }
- }
-
- return(1);
-
-}
-
-
-/*********************************************************************
- *
- * Function : acl_addr
- *
- * Description : Called from `load_aclfile'. FIXME: I can't say more.
- *
- * Parameters :
- * 1 : aspec = (what?)
- * 2 : aca = (what?)
- *
- * Returns : 0 => Ok, everything else is an error.
- *
- *********************************************************************/
-int acl_addr(char *aspec, struct access_control_addr *aca)
-{
- int i, masklength, port;
- char *p;
-
- masklength = 32;
- port = 0;
-
- if ((p = strchr(aspec, '/')))
- {
- *p++ = '\0';
-
- if (ijb_isdigit(*p) == 0)
- {
- return(-1);
- }
- masklength = atoi(p);
- }
-
- if ((masklength < 0) || (masklength > 32))
- {
- return(-1);
- }
-
- if ((p = strchr(aspec, ':')))
- {
- *p++ = '\0';
-
- if (ijb_isdigit(*p) == 0)
- {
- return(-1);
- }
- port = atoi(p);
- }
-
- aca->port = port;
-
- aca->addr = ntohl(resolve_hostname_to_ip(aspec));
-
- if (aca->addr == -1)
- {
- log_error(LOG_LEVEL_ERROR, "can't resolve address for %s", aspec);
- return(-1);
- }
-
- /* build the netmask */
- aca->mask = 0;
- for (i=1; i <= masklength ; i++)
- {
- aca->mask |= (1 << (32 - i));
- }
-
- /* now mask off the host portion of the ip address
- * (i.e. save on the network portion of the address).
- */
- aca->addr = aca->addr & aca->mask;
-
- return(0);
-
-}
-#endif /* def ACL_FILES */
-
-
-/*********************************************************************
- *
- * Function : block_url
- *
- * Description : Called from `chat'. Check to see if we need to block this.
- *
- * Parameters :
- * 1 : http = http_request request to "check" for blocked
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL => unblocked, else string to HTML block description.
- *
- *********************************************************************/
-char *block_url(struct http_request *http, struct client_state *csp)
-{
- struct file_list *fl;
- struct block_spec *b;
- struct url_spec url[1];
- char *p;
- int n;
-
- if (((fl = csp->blist) == NULL) || ((b = fl->f) == NULL))
- {
- return(NULL);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(NULL);
-
- for (b = b->next; b ; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
-
- if (b->reject == 0) return(NULL);
-
- n = strlen(CBLOCK);
- n += strlen(http->hostport);
- n += strlen(http->path);
- n += strlen(b->url->spec);
-#ifdef FORCE_LOAD
- n += strlen(http->hostport);
- n += strlen(http->path);
-#endif /* def FORCE_LOAD */
-
- p = (char *)malloc(n);
-
-#ifdef FORCE_LOAD
- sprintf(p, CBLOCK, http->hostport, http->path, b->url->spec, http->hostport, http->path);
-#else
- sprintf(p, CBLOCK, http->hostport, http->path, b->url->spec);
-#endif /* def FORCE_LOAD */
-
- return(p);
- }
- }
- }
- }
- freez(url->dbuf);
- freez(url->dvec);
- return(NULL);
-
-}
-
-
-#if defined(DETECT_MSIE_IMAGES) || defined(USE_IMAGE_LIST)
-/*********************************************************************
- *
- * Function : block_imageurl
- *
- * Description : Given a URL which is blocked, decide whether to
- * send the "blocked" image or HTML.
- *
- * Parameters :
- * 1 : http = URL to check.
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : True (nonzero) if URL is in image list, false (0)
- * otherwise
- *
- *********************************************************************/
-int block_imageurl(struct http_request *http, struct client_state *csp)
-{
-#ifdef DETECT_MSIE_IMAGES
- if ((csp->accept_types
- & (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
- == (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE))
- {
- return 1;
- }
- else if ((csp->accept_types
- & (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_IMAGE|ACCEPT_TYPE_MSIE_HTML))
- == (ACCEPT_TYPE_IS_MSIE|ACCEPT_TYPE_MSIE_HTML))
- {
- return 0;
- }
-#endif
-
-#if defined(USE_IMAGE_LIST)
- return block_imageurl_using_imagelist(http, csp);
-#else
- /* Don't know - assume HTML */
- return 0;
-#endif
-}
-#endif /* defined(DETECT_MSIE_IMAGES) || defined(USE_IMAGE_LIST) */
-
-
-#ifdef USE_IMAGE_LIST
-/*********************************************************************
- *
- * Function : block_imageurl
- *
- * Description : Test if a URL is in the imagelist.
- *
- * Parameters :
- * 1 : http = URL to check.
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : True (nonzero) if URL is in image list, false (0)
- * otherwise
- *
- *********************************************************************/
-int block_imageurl_using_imagelist(struct http_request *http, struct client_state *csp)
-{
- struct file_list *fl;
- struct block_spec *b;
- struct url_spec url[1];
-
- if (((fl = csp->ilist) == NULL) || ((b = fl->f) == NULL))
- {
- return(0);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(0);
-
- for (b = b->next; b ; b = b->next)
- {
-
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- /* port matches, check domain */
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- /* domain matches, check path */
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- /* Matches */
- freez(url->dbuf);
- freez(url->dvec);
-
- if (b->reject == 0) return(0);
-
- return(1);
- }
- }
- }
- }
- freez(url->dbuf);
- freez(url->dvec);
- return(0);
-
-}
-#endif /* def USE_IMAGE_LIST */
-
-
-#ifdef PCRS
-/*********************************************************************
- *
- * Function : re_process_buffer
- *
- * Description : Apply all jobs from the joblist (aka. Perl regexp's) to
- * the text buffer that's been accumulated in csp->iob->buf.
- * Then, write the modified buffer out to the client
- * (Maybe this should happen from jcc.c via flush_socket
- * for better readability).
- *
- * Parameters :
- * 1 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : N/A
- *
- *********************************************************************/
-void re_process_buffer(struct client_state *csp)
-{
- int hits=0;
- int size = csp->iob->eod - csp->iob->cur;
- char *old=csp->iob->cur, *new = NULL;
- pcrs_job *job, *joblist;
-
- struct file_list *fl;
- struct re_filterfile_spec *b;
-
- /* Sanity first ;-) */
- if (size <= 0)
- {
- return;
- }
-
- if ( ( NULL == (fl = csp->rlist) ) || ( NULL == (b = fl->f) ) )
- {
- log_error(LOG_LEVEL_ERROR, "Unable to get current state of regexp filtering.");
- return;
- }
-
- joblist = b->joblist;
-
-
- log_error(LOG_LEVEL_RE_FILTER, "re_filtering %s%s (size %d) ...",
- csp->http->hostport, csp->http->path, size);
-
- /* Apply all jobs from the joblist */
- for (job = joblist; NULL != job; job = job->next)
- {
- hits += pcrs_exec_substitution(job, old, size, &new, &size);
- if (old != csp->iob->cur) free(old);
- old=new;
- }
-
- log_error(LOG_LEVEL_RE_FILTER, " produced %d hits (new size %d).", hits, size);
-
- if (write_socket(csp->cfd, old, size) != size)
- {
- log_error(LOG_LEVEL_ERROR, "write to client failed.");
- }
-
- /* fwiw, reset the iob */
- IOB_RESET(csp);
- freez(new);
- return;
-
-}
-#endif /* def PCRS */
-
-
-#ifdef TRUST_FILES
-/*********************************************************************
- *
- * Function : trust_url
- *
- * Description : Should we "trust" this URL? See "trustfile" line in config.
- *
- * Parameters :
- * 1 : http = http_request request for requested URL
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL => trusted, else string to HTML "untrusted" description.
- *
- *********************************************************************/
-char *trust_url(struct http_request *http, struct client_state *csp)
-{
- struct file_list *fl;
- struct block_spec *b;
- struct url_spec url[1], **tl, *t;
- char *p, *h;
- char *hostport, *path, *refer;
- struct http_request rhttp[1];
- int n;
-
- if (((fl = csp->tlist) == NULL) || ((b = fl->f) == NULL))
- {
- return(NULL);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(NULL);
-
- memset(rhttp, '\0', sizeof(*rhttp));
-
- for (b = b->next; b ; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
-
- if (b->reject == 0) return(NULL);
-
- hostport = url_encode(http->hostport);
- path = url_encode(http->path);
-
- if (csp->referrer)
- {
- refer = url_encode(csp->referrer);
- }
- else
- {
- refer = url_encode("undefined");
- }
-
- n = strlen(CTRUST);
- n += strlen(hostport);
- n += strlen(path);
- n += strlen(refer);
-
- p = (char *)malloc(n);
-
- sprintf(p, CTRUST, hostport, path, refer);
-
- freez(hostport);
- freez(path);
- freez(refer);
-
- return(p);
- }
- }
- }
- }
-
- freez(url->dbuf);
- freez(url->dvec);
-
- if ((csp->referrer == NULL)|| (strlen(csp->referrer) <= 9))
- {
- /* no referrer was supplied */
- goto trust_url_not_trusted;
- }
-
- /* forge a URL from the referrer so we can use
- * convert_url() to parse it into its components.
- */
-
- p = NULL;
- p = strsav(p, "GET ");
- p = strsav(p, csp->referrer + 9); /* skip over "Referer: " */
- p = strsav(p, " HTTP/1.0");
-
- parse_http_request(p, rhttp, csp);
-
- if (rhttp->cmd == NULL)
- {
- freez(p);
- goto trust_url_not_trusted;
- }
-
- freez(p);
-
- *url = dsplit(rhttp->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) goto trust_url_not_trusted;
-
- for (tl = trust_list; (t = *tl) ; tl++)
- {
- if ((t->port == 0) || (t->port == rhttp->port))
- {
- if ((t->domain[0] == '\0') || domaincmp(t, url) == 0)
- {
- if ((t->path == NULL) ||
-#ifdef REGEX
- (regexec(t->preg, rhttp->path, 0, NULL, 0) == 0)
-#else
- (strncmp(t->path, rhttp->path, t->pathlen) == 0)
-#endif
- )
- {
- /* if the URL's referrer is from a trusted referrer, then
- * add the target spec to the trustfile as an unblocked
- * domain and return NULL (which means it's OK).
- */
-
- FILE *fp;
-
- freez(url->dbuf);
- freez(url->dvec);
-
- if ((fp = fopen(trustfile, "a")))
- {
- h = NULL;
-
- h = strsav(h, "~");
- h = strsav(h, http->hostport);
-
- p = http->path;
- if ((*p++ == '/')
- && (*p++ == '~'))
- {
- /* since this path points into a user's home space
- * be sure to include this spec in the trustfile.
- */
- if ((p = strchr(p, '/')))
- {
- *p = '\0';
- h = strsav(h, http->path);
- h = strsav(h, "/");
- }
- }
-
- free_http_request(rhttp);
-
- fprintf(fp, "%s\n", h);
- freez(h);
- fclose(fp);
- }
- return(NULL);
- }
- }
- }
- }
-
-trust_url_not_trusted:
- free_http_request(rhttp);
-
- hostport = url_encode(http->hostport);
- path = url_encode(http->path);
-
- if (csp->referrer)
- {
- refer = url_encode(csp->referrer);
- }
- else
- {
- refer = url_encode("undefined");
- }
-
- n = strlen(CTRUST);
- n += strlen(hostport);
- n += strlen(path);
- n += strlen(refer);
-
- p = (char *)malloc(n);
- sprintf(p, CTRUST, hostport, path, refer);
-
- freez(hostport);
- freez(path);
- freez(refer);
-
- return(p);
-
-}
-#endif /* def TRUST_FILES */
-
-
-/*********************************************************************
- *
- * Function : intercept_url
- *
- * Description : checks the URL `basename' against a list of URLs to
- * snarf. If it matches, it calls the associated function
- * which returns an HTML page to send back to the client.
- * Right now, we snarf:
- * "show-proxy-args", and
- * "ij-untrusted-url" (optional w/TRUST_FILES)
- *
- * Parameters :
- * 1 : http = http_request request, check `basename's of blocklist
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL for no recognized URLs, or an HTML description page.
- *
- *********************************************************************/
-char *intercept_url(struct http_request *http, struct client_state *csp)
-{
- char *basename;
- const struct interceptors *v;
-
- basename = strrchr(http->path, '/');
-
- if (basename == NULL) return(NULL);
-
- basename ++; /* first char past the last slash */
-
- if (*basename)
- {
- for (v = intercept_patterns; v->str; v++)
- {
- if (strncmp(basename, v->str, v->len) == 0)
- {
- return((v->interceptor)(http, csp));
- }
- }
- }
-
- return(NULL);
-
-}
-
-#ifdef FAST_REDIRECTS
-/*********************************************************************
- *
- * Function : redirect_url
- *
- * Description : Checks for redirection URLs and returns a HTTP redirect
- * to the destination URL.
- *
- * Parameters :
- * 1 : http = http_request request, check `basename's of blocklist
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : NULL if URL was clean, HTTP redirect otherwise.
- *
- *********************************************************************/
-char *redirect_url(struct http_request *http, struct client_state *csp)
-{
- char *p, *q;
-
- p = q = csp->http->path;
- log_error(LOG_LEVEL_REDIRECTS, "checking path: %s", p);
-
- /* find the last URL encoded in the request */
- while (p = strstr(p, "http://"))
- {
- q = p++;
- }
-
- /* if there was any, generate and return a HTTP redirect */
- if (q != csp->http->path)
- {
- log_error(LOG_LEVEL_REDIRECTS, "redirecting to: %s", q);
-
- p = (char *)malloc(strlen(HTTP_REDIRECT_TEMPLATE) + strlen(q));
- sprintf(p, HTTP_REDIRECT_TEMPLATE, q);
- return(p);
- }
- else
- {
- return(NULL);
- }
-
-}
-#endif /* def FAST_REDIRECTS */
-
-/*********************************************************************
- *
- * Function : url_permissions
- *
- * Description : Gets the permissions for this URL.
- *
- * Parameters :
- * 1 : http = http_request request for blocked URLs
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : permissions bitmask specifiying what this URL can do.
- * If not on list, will be default_permissions.
- *
- *********************************************************************/
-int url_permissions(struct http_request *http, struct client_state *csp)
-{
- struct file_list *fl;
- struct permissions_spec *b;
- struct url_spec url[1];
-
- if (((fl = csp->permissions_list) == NULL) || ((b = fl->f) == NULL))
- {
- return(default_permissions);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL)
- {
- return(default_permissions);
- }
-
- for (b = b->next; NULL != b; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
- return(b->permissions);
- }
- }
- }
- }
-
- freez(url->dbuf);
- freez(url->dvec);
- return(default_permissions);
-
-}
-
-
-/*********************************************************************
- *
- * Function : forward_url
- *
- * Description : Should we forward this to another proxy?
- *
- * Parameters :
- * 1 : http = http_request request for current URL
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : Return gw_default for no forward match,
- * else a gateway pointer to a specific forwarding proxy.
- *
- *********************************************************************/
-const struct gateway *forward_url(struct http_request *http, struct client_state *csp)
-{
- struct file_list *fl;
- struct forward_spec *b;
- struct url_spec url[1];
-
- if (((fl = csp->flist) == NULL) || ((b = fl->f) == NULL))
- {
- return(gw_default);
- }
-
- *url = dsplit(http->host);
-
- /* if splitting the domain fails, punt */
- if (url->dbuf == NULL) return(gw_default);
-
- for (b = b->next; b ; b = b->next)
- {
- if ((b->url->port == 0) || (b->url->port == http->port))
- {
- if ((b->url->domain[0] == '\0') || (domaincmp(b->url, url) == 0))
- {
- if ((b->url->path == NULL) ||
-#ifdef REGEX
- (regexec(b->url->preg, http->path, 0, NULL, 0) == 0)
-#else
- (strncmp(b->url->path, http->path, b->url->pathlen) == 0)
-#endif
- )
- {
- freez(url->dbuf);
- freez(url->dvec);
- return(b->gw);
- }
- }
- }
- }
-
- freez(url->dbuf);
- freez(url->dvec);
- return(gw_default);
-
-}
-
-
-/*********************************************************************
- *
- * Function : dsplit
- *
- * Description : Takes a domain and returns a pointer to a url_spec
- * structure populated with dbuf, dcnt and dvec. The
- * other fields in the structure that is returned are zero.
- *
- * Parameters :
- * 1 : domain = a URL address
- *
- * Returns : url_spec structure populated with dbuf, dcnt and dvec.
- *
- *********************************************************************/
-struct url_spec dsplit(char *domain)
-{
- struct url_spec ret[1];
- char *v[BUFSIZ];
- int size;
- char *p;
-
- memset(ret, '\0', sizeof(*ret));
-
- if ((p = strrchr(domain, '.')))
- {
- if (*(++p) == '\0')
- {
- ret->toplevel = 1;
- }
- }
-
- ret->dbuf = strdup(domain);
-
- /* map to lower case */
- for (p = ret->dbuf; *p ; p++) *p = tolower(*p);
-
- /* split the domain name into components */
- ret->dcnt = ssplit(ret->dbuf, ".", v, SZ(v), 1, 1);
-
- if (ret->dcnt <= 0)
- {
- memset(ret, '\0', sizeof(ret));
- return(*ret);
- }
-
- /* save a copy of the pointers in dvec */
- size = ret->dcnt * sizeof(*ret->dvec);
-
- if ((ret->dvec = (char **)malloc(size)))
- {
- memcpy(ret->dvec, v, size);
- }
-
- return(*ret);
-
-}
-
-
-/*********************************************************************
- *
- * Function : domaincmp
- *
- * Description : Compare domain names.
- * domaincmp("a.b.c" , "a.b.c") => 0 (MATCH)
- * domaincmp("a*.b.c", "a.b.c") => 0 (MATCH)
- * domaincmp("b.c" , "a.b.c") => 0 (MATCH)
- * domaincmp("" , "a.b.c") => 0 (MATCH)
- *
- * 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.
- *
- *********************************************************************/
-int domaincmp(struct url_spec *pattern, struct url_spec *fqdn)
-{
- char **pv, **fv; /* vectors */
- int pn, fn; /* counters */
- char *p, *f; /* chars */
-
- pv = pattern->dvec;
- pn = pattern->dcnt;
-
- fv = fqdn->dvec;
- fn = fqdn->dcnt;
-
- while ((pn > 0) && (fn > 0))
- {
- p = pv[--pn];
- f = fv[--fn];
-
- while (*p && *f && (*p == tolower(*f)))
- {
- p++, f++;
- }
-
- if ((*p != tolower(*f)) && (*p != '*')) return(1);
- }
-
- if (pn > 0) return(1);
-
- return(0);
-
-}
-
-
-/* intercept functions */
-
-/*********************************************************************
- *
- * Function : show_proxy_args
- *
- * Description : This "crunch"es "http:/any.thing/show-proxy-args" and
- * returns a web page describing the current status of IJB.
- *
- * Parameters :
- * 1 : http = ignored
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : A string that contains the current status of IJB.
- *
- *********************************************************************/
-char *show_proxy_args(struct http_request *http, struct client_state *csp)
-{
- char *s = NULL;
-
-#ifdef SPLIT_PROXY_ARGS
- FILE * fp;
- char buf[BUFSIZ];
- char * p;
- const char * filename = NULL;
- const char * file_description = NULL;
- char * query_string = strrchr(http->path, '?');
- char which_file = '\0';
-
-
- if (query_string != NULL)
- {
- /* first char past the last '?' (maybe '\0')*/
- which_file = query_string[1];
- }
- switch (which_file)
- {
- case 'b':
- if (csp->blist)
- {
- filename = csp->blist->filename;
- file_description = "Block List";
- }
- break;
- case 'p':
- if (csp->permissions_list)
- {
- filename = csp->permissions_list->filename;
- file_description = "Permissions List";
- }
- break;
- case 'f':
- if (csp->flist)
- {
- filename = csp->flist->filename;
- file_description = "Forward List";
- }
- break;
-
-#ifdef ACL_FILES
- case 'a':
- if (csp->alist)
- {
- filename = csp->alist->filename;
- file_description = "Access Control List";
- }
- break;
-#endif /* def ACL_FILES */
-
-#ifdef USE_IMAGE_LIST
- case 'i':
- if (csp->ilist)
- {
- filename = csp->ilist->filename;
- file_description = "Image List";
- }
- break;
-#endif /* def USE_IMAGE_LIST */
-
-#ifdef PCRS
- case 'r':
- if (csp->rlist)
- {
- filename = csp->rlist->filename;
- file_description = "RE Filter List";
- }
- break;
-#endif /* def PCRS */
-
-#ifdef TRUST_FILES
- case 't':
- if (csp->tlist)
- {
- filename = csp->tlist->filename;
- file_description = "Trust List";
- }
- break;
-#endif /* def TRUST_FILES */
- }
-
- if (filename)
- {
- /* Display specified file */
- /* FIXME: Add HTTP headers so this isn't cached */
- s = strsav(s,
- "HTTP/1.0 200 OK\n"
- "Server: IJ/" VERSION "\n"
- "Content-type: text/html\n"
- "Pragma: no-cache\n"
- "Last-Modified: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Expires: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "\n"
-
- "<html>"
- "<head>"
- "<title>Internet Junkbuster Proxy Status - ");
- s = strsav(s, file_description);
- s = strsav(s,
- "</title>"
- "</head>\n"
- "<body bgcolor=\"#f8f8f0\" link=\"#000078\" alink=\"#ff0022\" vlink=\"#787878\">\n"
- "<center>\n"
- "<h1>" BANNER "\n");
- s = strsav(s, file_description);
- s = strsav(s,
- "</h1></center>\n"
- "<p><a href=\"show-proxy-args\">Back to proxy status</a></p>\n"
- "<h2>");
- s = strsav(s, file_description);
- s = strsav(s,
- "</h2>\n"
- "Contents of file "<code>");
- p = html_encode(filename);
- s = strsav(s, p);
- freez(p);
- s = strsav(s,
- "</code>":<br>\n"
- "</p>\n"
- "<pre>");
-
- if ((fp = fopen(filename, "r")) == NULL)
- {
- s = strsav(s, "</pre><h1>ERROR OPENING FILE!</h1><pre>");
- }
- else
- {
- while (fgets(buf, sizeof(buf), fp))
- {
- p = html_encode(buf);
- if (p)
- {
- s = strsav(s, p);
- freez(p);
- s = strsav(s, "<br>");
- }
- }
- fclose(fp);
- }
-
- s = strsav(s,
- "</pre>\n"
- "<br>\n"
- "<p><a href=\"show-proxy-args\">Back to proxy status</a></p>\n"
- "<br>\n"
- "<small><small><p>\n"
- "The " BANNER " Proxy - \n"
- "<a href=\"" HOME_PAGE_URL "\">" HOME_PAGE_URL "</a>\n"
- "</small></small>"
- "</body></html>\n");
- return(s);
- }
-#endif /* def SPLIT_PROXY_ARGS */
-
- s = strsav(s, proxy_args->header);
- s = strsav(s, proxy_args->invocation);
-#ifdef STATISTICS
- s = add_stats(s);
-#endif /* def STATISTICS */
- s = strsav(s, proxy_args->gateways);
-
-#ifdef SPLIT_PROXY_ARGS
- s = strsav(s,
- "<h2>The following files are in use:</h2>\n"
- "<p>(Click a filename to view it)</p>\n"
- "<ul>\n");
-
- if (csp->blist)
- {
- s = strsav(s, "<li>Block List: <a href=\"show-proxy-args?block\"><code>");
- s = strsav(s, csp->blist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-
- if (csp->permissions_list)
- {
- s = strsav(s, "<li>Permissions List: <a href=\"show-proxy-args?permit\"><code>");
- s = strsav(s, csp->permissions_list->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-
- if (csp->flist)
- {
- s = strsav(s, "<li>Forward List: <a href=\"show-proxy-args?forward\"><code>");
- s = strsav(s, csp->flist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-
-#ifdef ACL_FILES
- if (csp->alist)
- {
- s = strsav(s, "<li>Access Control List: <a href=\"show-proxy-args?acl\"><code>");
- s = strsav(s, csp->alist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-#endif /* def ACL_FILES */
-
-#ifdef USE_IMAGE_LIST
- if (csp->ilist)
- {
- s = strsav(s, "<li>Image List: <a href=\"show-proxy-args?image\"><code>");
- s = strsav(s, csp->ilist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-#endif /* def USE_IMAGE_LIST */
-
-#ifdef PCRS
- if (csp->rlist)
- {
- s = strsav(s, "<li>RE Filter List: <a href=\"show-proxy-args?re\"><code>");
- s = strsav(s, csp->rlist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-#endif /* def PCRS */
-
-#ifdef TRUST_FILES
- if (csp->tlist)
- {
- s = strsav(s, "<li>Trust List: <a href=\"show-proxy-args?trust\"><code>");
- s = strsav(s, csp->tlist->filename);
- s = strsav(s, "</code></a></li>\n");
- }
-#endif /* def TRUST_FILES */
-
- s = strsav(s, "</ul>");
-
-#else /* ifndef SPLIT_PROXY_ARGS */
- if (csp->blist)
- {
- s = strsav(s, csp->blist->proxy_args);
- }
-
- if (csp->clist)
- {
- s = strsav(s, csp->clist->proxy_args);
- }
-
- if (csp->flist)
- {
- s = strsav(s, csp->flist->proxy_args);
- }
-
-#ifdef ACL_FILES
- if (csp->alist)
- {
- s = strsav(s, csp->alist->proxy_args);
- }
-#endif /* def ACL_FILES */
-
-#ifdef USE_IMAGE_LIST
- if (csp->ilist)
- {
- s = strsav(s, csp->ilist->proxy_args);
- }
-#endif /* def USE_IMAGE_LIST */
-
-#ifdef PCRS
- if (csp->rlist)
- {
- s = strsav(s, csp->rlist->proxy_args);
- }
-#endif /* def PCRS */
-
-#ifdef TRUST_FILES
- if (csp->tlist)
- {
- s = strsav(s, csp->tlist->proxy_args);
- }
-#endif /* def TRUST_FILES */
-
-#endif /* ndef SPLIT_PROXY_ARGS */
-
- s = strsav(s, proxy_args->trailer);
-
- return(s);
-
-}
-
-
-/*********************************************************************
- *
- * Function : ijb_send_banner
- *
- * Description : This "crunch"es "http:/any.thing/ijb-send-banner and
- * thus triggers sending the image in jcc.c:chat.
- * For the unlikely case, that the imagefile/MSIE
- * mechanism is not used, or tinygif = 0, a page
- * describing the reson of the interception is generated.
- *
- * Parameters :
- * 1 : http = http_request request for crunched URL
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : A string that contains why this was intercepted.
- *
- *********************************************************************/
-char *ijb_send_banner(struct http_request *http, struct client_state *csp)
-{
- return(strdup(CNOBANNER));
-}
-
-#ifdef TRUST_FILES
-/*********************************************************************
- *
- * Function : ij_untrusted_url
- *
- * Description : This "crunch"es "http:/any.thing/ij-untrusted-url" and
- * returns a web page describing why it was untrusted.
- *
- * Parameters :
- * 1 : http = http_request request for crunched URL
- * 2 : csp = Current client state (buffers, headers, etc...)
- *
- * Returns : A string that contains why this was untrusted.
- *
- *********************************************************************/
-char *ij_untrusted_url(struct http_request *http, struct client_state *csp)
-{
- int n;
- char *hostport, *path, *refer, *p, *v[9];
- char buf[BUFSIZ];
- struct url_spec **tl, *t;
-
-
- static const char format[] =
- "HTTP/1.0 200 OK\r\n"
- "Pragma: no-cache\n"
- "Last-Modified: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Expires: Thu Jul 31, 1997 07:42:22 pm GMT\n"
- "Content-Type: text/html\n\n"
- "<html>\n"
- "<head>\n"
- "<title>Internet Junkbuster: Request for untrusted URL</title>\n"
- "</head>\n"
- BODY
- "<center><h1>"
- BANNER
- "</h1></center>"
- "The " BANNER " Proxy "
- "<A href=\"" HOME_PAGE_URL "\">"
- "(" HOME_PAGE_URL ") </A>"
- "intercepted the request for %s%s\n"
- "because the URL is not trusted.\n"
- "<br><br>\n";
-
- if ((n = ssplit(http->path, "?+", v, SZ(v), 0, 0)) == 4)
- {
- hostport = url_decode(v[1]);
- path = url_decode(v[2]);
- refer = url_decode(v[3]);
- }
- else
- {
- hostport = strdup("undefined_host");
- path = strdup("/undefined_path");
- refer = strdup("undefined");
- }
-
- n = sizeof(format);
- n += strlen(hostport);
- n += strlen(path );
-
- if ((p = (char *)malloc(n)))
- {
- sprintf(p, format, hostport, path);
- }
-
- strsav(p, "The referrer in this request was <strong>");
- strsav(p, refer);
- strsav(p, "</strong><br>\n");
-
- freez(hostport);
- freez(path );
- freez(refer );
-
- p = strsav(p, "<h3>The following referrers are trusted</h3>\n");
-
- for (tl = trust_list; (t = *tl) ; tl++)
- {
- sprintf(buf, "%s<br>\n", t->spec);
- p = strsav(p, buf);
- }
-
- if (trust_info->next)
- {
- struct list *l;
-
- strcpy(buf,
- "<p>"
- "You can learn more about what this means "
- "and what you may be able to do about it by "
- "reading the following documents:<br>\n"
- "<ol>\n"
- );
-
- p = strsav(p, buf);
-
- for (l = trust_info->next; l ; l = l->next)
- {
- sprintf(buf,
- "<li> <a href=%s>%s</a><br>\n",
- l->str, l->str);
- p = strsav(p, buf);
- }
-
- p = strsav(p, "</ol>\n");
- }
-
- p = strsav(p, "</body>\n" "</html>\n");
-
- return(p);
-
-}
-#endif /* def TRUST_FILES */
-
-
-#ifdef STATISTICS
-/*********************************************************************
- *
- * Function : add_stats
- *
- * Description : Statistics function of JB. Called by `show_proxy_args'.
- *
- * Parameters :
- * 1 : s = string that holds the proxy args description page
- *
- * Returns : A pointer to the descriptive status web page.
- *
- *********************************************************************/
-char *add_stats(char *s)
-{
- /*
- * Output details of the number of requests rejected and
- * accepted. This is switchable in the junkbuster config.
- * Does nothing if this option is not enabled.
- */
-
- float perc_rej; /* Percentage of http requests rejected */
- char out_str[81];
- int local_urls_read = urls_read;
- int local_urls_rejected = urls_rejected;
-
- /*
- * Need to alter the stats not to include the fetch of this
- * page.
- *
- * Can't do following thread safely! doh!
- *
- * urls_read--;
- * urls_rejected--; * This will be incremented subsequently *
- */
-
- s = strsav(s,"<h2>Statistics for this " BANNER ":</h2>\n");
-
- if (local_urls_read == 0)
- {
-
- s = strsav(s,"No activity so far!\n");
-
- }
- else
- {
-
- perc_rej = (float)local_urls_rejected * 100.0F /
- (float)local_urls_read;
-
- sprintf(out_str,
- "%d requests received, %d filtered "
- "(%6.2f %%).",
- local_urls_read,
- local_urls_rejected, perc_rej);
-
- s = strsav(s,out_str);
- }
-
- return(s);
-}
-#endif /* def STATISTICS */
-
-
-/*
- Local Variables:
- tab-width: 3
- end:
-*/
projects / privoxy.git / blobdiff