1 const char jcc_rcs[] = "$Id: jcc.c,v 1.39 2001/09/16 13:21:27 jongfoster Exp $";
2 /*********************************************************************
4 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
6 * Purpose : Main file. Contains main() method, main loop, and
7 * the main connection-handling function.
9 * Copyright : Written by and Copyright (C) 2001 the SourceForge
10 * IJBSWA team. http://ijbswa.sourceforge.net
12 * Based on the Internet Junkbuster originally written
13 * by and Copyright (C) 1997 Anonymous Coders and
14 * Junkbusters Corporation. http://www.junkbusters.com
16 * This program is free software; you can redistribute it
17 * and/or modify it under the terms of the GNU General
18 * Public License as published by the Free Software
19 * Foundation; either version 2 of the License, or (at
20 * your option) any later version.
22 * This program is distributed in the hope that it will
23 * be useful, but WITHOUT ANY WARRANTY; without even the
24 * implied warranty of MERCHANTABILITY or FITNESS FOR A
25 * PARTICULAR PURPOSE. See the GNU General Public
26 * License for more details.
28 * The GNU General Public License should be included with
29 * this file. If not, you can view it at
30 * http://www.gnu.org/copyleft/gpl.html
31 * or write to the Free Software Foundation, Inc., 59
32 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
36 * Revision 1.39 2001/09/16 13:21:27 jongfoster
37 * Changes to use new list functions.
39 * Revision 1.38 2001/09/16 13:01:46 jongfoster
40 * Removing redundant function call that zeroed zalloc()'d memory.
42 * Revision 1.37 2001/09/10 11:12:24 oes
43 * Deleted unused variable
45 * Revision 1.36 2001/09/10 10:56:15 oes
46 * Silenced compiler warnings
48 * Revision 1.35 2001/07/31 14:44:22 oes
49 * Deleted unused size parameter from filter_popups()
51 * Revision 1.34 2001/07/30 22:08:36 jongfoster
52 * Tidying up #defines:
53 * - All feature #defines are now of the form FEATURE_xxx
54 * - Permanently turned off WIN_GUI_EDIT
55 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
57 * Revision 1.33 2001/07/29 19:32:00 jongfoster
58 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
60 * Revision 1.32 2001/07/29 18:47:05 jongfoster
61 * Adding missing #include "loadcfg.h"
63 * Revision 1.31 2001/07/29 12:17:48 oes
64 * Applied pthread fix by Paul Lieverse
66 * Revision 1.30 2001/07/25 22:57:13 jongfoster
67 * __BEOS__ no longer overrides FEATURE_PTHREAD.
68 * This is because FEATURE_PTHREAD will soon be widely used, so I
69 * want to keep it simple.
71 * Revision 1.29 2001/07/24 12:47:06 oes
72 * Applied BeOS support update by Eugenia
74 * Revision 1.28 2001/07/23 13:26:12 oes
75 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
77 * Revision 1.27 2001/07/19 19:09:47 haroon
78 * - Added code to take care of the situation where while processing the first
79 * server response (which includes the server header), after finding the end
80 * of the headers we were not looking past the end of the headers for
81 * content modification. I enabled it for filter_popups.
82 * Someone else should look to see if other similar operations should be
83 * done to the discarded portion of the buffer.
85 * Note 2001/07/20: No, the other content modification mechanisms will process
86 * the whole iob later anyway. --oes
88 * Revision 1.26 2001/07/18 12:31:36 oes
91 * Revision 1.25 2001/07/15 19:43:49 jongfoster
92 * Supports POSIX threads.
93 * Also removed some unused #includes.
95 * Revision 1.24 2001/07/13 14:00:40 oes
96 * - Generic content modification scheme:
97 * Each feature has its own applicability flag that is set
98 * from csp->action->flags.
99 * Replaced the "filtering" int flag , by a function pointer
100 * "content_filter" to the function that will do the content
101 * modification. If it is != NULL, the document will be buffered
102 * and processed through *content_filter, which must set
103 * csp->content_length and return a modified copy of the body
104 * or return NULL (on failiure).
105 * - Changed csp->is_text to the more generic bitmap csp->content_type
106 * which can currently take the valued CT_TEXT or CT_GIF
108 * - Removed all #ifdef PCRS
110 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
111 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
112 * the `block_acl' call. This prevents a compilation error when the user
113 * does not wish to use the "ACL" feature.
115 * Revision 1.22 2001/06/29 21:45:41 oes
116 * Indentation, CRLF->LF, Tab-> Space
118 * Revision 1.21 2001/06/29 13:29:36 oes
119 * - Cleaned up, improved comments
120 * - Unified all possible interceptors (CGI,
121 * block, trust, fast_redirect) in one
122 * place, with one (CGI) answer generation
123 * mechansim. Much clearer now.
124 * - Removed the GIF image generation, which
125 * is now done in filters.c:block_url()
126 * - Made error conditions like domain lookup
127 * failiure or (various) problems while talking
128 * to the server use cgi.c:error_response()
129 * instead of generating HTML/HTTP in chat() (yuck!)
130 * - Removed logentry from cancelled commit
132 * Revision 1.20 2001/06/09 10:55:28 jongfoster
133 * Changing BUFSIZ ==> BUFFER_SIZE
135 * Revision 1.19 2001/06/07 23:12:52 jongfoster
136 * Replacing function pointer in struct gateway with a directly
137 * called function forwarded_connect().
138 * Replacing struct gateway with struct forward_spec
140 * Revision 1.18 2001/06/03 19:12:16 oes
141 * introduced new cgi handling
143 * Revision 1.17 2001/06/01 20:07:23 jongfoster
144 * Now uses action +image-blocker{} rather than config->tinygif
146 * Revision 1.16 2001/06/01 18:49:17 jongfoster
147 * Replaced "list_share" with "list" - the tiny memory gain was not
148 * worth the extra complexity.
150 * Revision 1.15 2001/05/31 21:24:47 jongfoster
151 * Changed "permission" to "action" throughout.
152 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
153 * Moved vanilla wafer check into chat(), since we must now
154 * decide whether or not to add it based on the URL.
156 * Revision 1.14 2001/05/29 20:14:01 joergs
157 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
160 * Revision 1.13 2001/05/29 09:50:24 jongfoster
161 * Unified blocklist/imagelist/permissionslist.
162 * File format is still under discussion, but the internal changes
165 * Also modified interceptor behaviour:
166 * - We now intercept all URLs beginning with one of the following
167 * prefixes (and *only* these prefixes):
169 * * http://ijbswa.sf.net/config/
170 * * http://ijbswa.sourceforge.net/config/
171 * - New interceptors "home page" - go to http://i.j.b/ to see it.
172 * - Internal changes so that intercepted and fast redirect pages
173 * are not replaced with an image.
174 * - Interceptors now have the option to send a binary page direct
175 * to the client. (i.e. ijb-send-banner uses this)
176 * - Implemented show-url-info interceptor. (Which is why I needed
177 * the above interceptors changes - a typical URL is
178 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
179 * The previous mechanism would not have intercepted that, and
180 * if it had been intercepted then it then it would have replaced
183 * Revision 1.12 2001/05/27 22:17:04 oes
185 * - re_process_buffer no longer writes the modified buffer
186 * to the client, which was very ugly. It now returns the
187 * buffer, which it is then written by chat.
189 * - content_length now adjusts the Content-Length: header
190 * for modified documents rather than crunch()ing it.
191 * (Length info in csp->content_length, which is 0 for
192 * unmodified documents)
194 * - For this to work, sed() is called twice when filtering.
196 * Revision 1.11 2001/05/26 17:27:53 jongfoster
197 * Added support for CLF and fixed LOG_LEVEL_LOG.
198 * Also did CRLF->LF fix of my previous patch.
200 * Revision 1.10 2001/05/26 15:26:15 jongfoster
201 * ACL feature now provides more security by immediately dropping
202 * connections from untrusted hosts.
204 * Revision 1.9 2001/05/26 00:28:36 jongfoster
205 * Automatic reloading of config file.
206 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
207 * Most of the global variables have been moved to a new
208 * struct configuration_spec, accessed through csp->config->globalname
209 * Most of the globals remaining are used by the Win32 GUI.
211 * Revision 1.8 2001/05/25 22:43:18 jongfoster
212 * Fixing minor memory leak and buffer overflow.
214 * Revision 1.7 2001/05/25 22:34:30 jongfoster
217 * Revision 1.6 2001/05/23 00:13:58 joergs
218 * AmigaOS support fixed.
220 * Revision 1.5 2001/05/22 18:46:04 oes
222 * - Enabled filtering banners by size rather than URL
223 * by adding patterns that replace all standard banner
224 * sizes with the "Junkbuster" gif to the re_filterfile
226 * - Enabled filtering WebBugs by providing a pattern
227 * which kills all 1x1 images
229 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
230 * which is selected by the (nonstandard and therefore
231 * capital) letter 'U' in the option string.
232 * It causes the quantifiers to be ungreedy by default.
233 * Appending a ? turns back to greedy (!).
235 * - Added a new interceptor ijb-send-banner, which
236 * sends back the "Junkbuster" gif. Without imagelist or
237 * MSIE detection support, or if tinygif = 1, or the
238 * URL isn't recognized as an imageurl, a lame HTML
239 * explanation is sent instead.
241 * - Added new feature, which permits blocking remote
242 * script redirects and firing back a local redirect
244 * The feature is conditionally compiled, i.e. it
245 * can be disabled with --disable-fast-redirects,
246 * plus it must be activated by a "fast-redirects"
247 * line in the config file, has its own log level
248 * and of course wants to be displayed by show-proxy-args
249 * Note: Boy, all the #ifdefs in 1001 locations and
250 * all the fumbling with configure.in and acconfig.h
251 * were *way* more work than the feature itself :-(
253 * - Because a generic redirect template was needed for
254 * this, tinygif = 3 now uses the same.
256 * - Moved GIFs, and other static HTTP response templates
261 * - Removed some >400 CRs again (Jon, you really worked
264 * Revision 1.4 2001/05/21 19:34:01 jongfoster
265 * Made failure to bind() a fatal error.
267 * Revision 1.3 2001/05/20 01:21:20 jongfoster
268 * Version 2.9.4 checkin.
269 * - Merged popupfile and cookiefile, and added control over PCRS
270 * filtering, in new "permissionsfile".
271 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
272 * file error you now get a message box (in the Win32 GUI) rather
273 * than the program exiting with no explanation.
274 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
276 * - Removed tabs from "config"
277 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
278 * - Bumped up version number.
280 * Revision 1.2 2001/05/17 22:34:44 oes
281 * - Added hint on GIF char array generation to jcc.c
282 * - Cleaned CRLF's from the sources and related files
283 * - Repaired logging for REF and FRC
285 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
286 * Initial import of version 2.9.3 source tree
289 *********************************************************************/
295 #include <sys/types.h>
302 #ifdef FEATURE_PTHREAD
304 #endif /* def FEATURE_PTHREAD */
307 # ifndef FEATURE_PTHREAD
308 # include <windows.h>
309 # include <process.h>
310 # endif /* ndef FEATURE_PTHREAD */
313 # ifndef _WIN_CONSOLE
315 # endif /* ndef _WIN_CONSOLE */
317 #else /* ifndef _WIN32 */
320 # include <sys/time.h>
321 # include <sys/wait.h>
322 # include <sys/stat.h>
326 # include <socket.h> /* BeOS has select() for sockets only. */
327 # include <OS.h> /* declarations for threads and stuff. */
341 #include "showargs.h"
343 #include "killpopup.h"
344 #include "miscutil.h"
346 #include "jbsockets.h"
352 const char jcc_h_rcs[] = JCC_H_VERSION;
353 const char project_h_rcs[] = PROJECT_H_VERSION;
355 struct client_state clients[1];
356 struct file_list files[1];
358 #ifdef FEATURE_STATISTICS
359 int urls_read = 0; /* total nr of urls read inc rejected */
360 int urls_rejected = 0; /* total nr of urls rejected */
361 #endif /* def FEATURE_STATISTICS */
364 static void listen_loop(void);
365 static void chat(struct client_state *csp);
367 void serve(struct client_state *csp);
368 #else /* ifndef AMIGA */
369 static void serve(struct client_state *csp);
370 #endif /* def AMIGA */
373 static int32 server_thread(void *data);
374 #endif /* def __BEOS__ */
377 #define sleep(N) Sleep(((N) * 1000))
381 /* The vanilla wafer. */
382 static const char VANILLA_WAFER[] =
383 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
384 "Do_not_send_me_any_copyrighted_information_other_than_the_"
385 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
386 "In_particular_do_not_send_me_any_cookies_that_"
387 "are_subject_to_a_claim_of_copyright_by_anybody._"
388 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
389 "(copyright_or_otherwise)_applying_to_any_cookie._";
392 /*********************************************************************
396 * Description : Once a connection to the client has been accepted,
397 * this function is called (via serve()) to handle the
398 * main business of the communication. When this
399 * function returns, the caller must close the client
403 * 1 : csp = Current client state (buffers, headers, etc...)
405 * Returns : On success, the number of bytes written are returned (zero
406 * indicates nothing was written). On error, -1 is returned,
407 * and errno is set appropriately. If count is zero and the
408 * file descriptor refers to a regular file, 0 will be
409 * returned without causing any other effect. For a special
410 * file, the results are not portable.
412 *********************************************************************/
413 static void chat(struct client_state *csp)
416 * This next lines are a little ugly, but they simplifies the if statements
417 * below. Basically if TOGGLE, then we want the if to test "csp->toggled_on",
418 * else we don't. And if FEATURE_FORCE_LOAD, then we want the if to test
419 * "csp->toggled_on", else we don't
421 #ifdef FEATURE_TOGGLE
422 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
423 #else /* ifndef FEATURE_TOGGLE */
424 # define IS_TOGGLED_ON_AND
425 #endif /* ndef FEATURE_TOGGLE */
426 #ifdef FEATURE_FORCE_LOAD
427 # define IS_NOT_FORCED_AND (!csp->force) &&
428 #else /* ifndef FEATURE_FORCE_LOAD */
429 # define IS_NOT_FORCED_AND
430 #endif /* def FEATURE_FORCE_LOAD */
432 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
434 char buf[BUFFER_SIZE];
437 int n, maxfd, server_body;
438 int ms_iis5_hack = 0;
440 const struct forward_spec * fwd;
441 struct http_request *http;
442 #ifdef FEATURE_KILL_POPUPS
443 int block_popups; /* bool, 1==will block popups */
444 int block_popups_now = 0; /* bool, 1==currently blocking popups */
445 #endif /* def FEATURE_KILL_POPUPS */
447 int pcrs_filter; /* bool, 1==will filter through pcrs */
448 int gif_deanimate; /* bool, 1==will deanimate gifs */
450 /* Function that does the content filtering for the current request */
451 char *(*content_filter)() = NULL;
453 /* Skeleton for HTTP response, if we should intercept the request */
454 struct http_response *rsp;
459 * Read the client's request. Note that since we're not using select() we
460 * could get blocked here if a client connected, then didn't say anything!
465 n = read_socket(csp->cfd, buf, sizeof(buf));
467 if (n <= 0) break; /* error! */
469 add_to_iob(csp, buf, n);
471 req = get_header(csp);
475 break; /* no HTTP request! */
480 continue; /* more to come! */
483 #ifdef FEATURE_FORCE_LOAD
484 /* If this request contains the FORCE_PREFIX,
485 * better get rid of it now and set the force flag --oes
488 if (strstr(req, FORCE_PREFIX))
490 strclean(req, FORCE_PREFIX);
491 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
498 #endif /* def FEATURE_FORCE_LOAD */
500 parse_http_request(req, http, csp);
505 if (http->cmd == NULL)
507 strcpy(buf, CHEADER);
508 write_socket(csp->cfd, buf, strlen(buf));
510 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
515 /* decide how to route the HTTP request */
517 if ((fwd = forward_url(http, csp)) == NULL)
519 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
520 /* Never get here - LOG_LEVEL_FATAL causes program exit */
523 /* build the http request to send to the server
524 * we have to do one of the following:
526 * create = use the original HTTP request to create a new
527 * HTTP request that has only the path component
528 * without the http://domainspec
529 * pass = pass the original HTTP request unchanged
531 * drop = drop the HTTP request
536 * +--------+--------+
538 * 0 | create | drop |
540 * Forwarding +--------+--------+
544 * +--------+--------+
548 if (fwd->forward_host)
550 /* if forwarding, just pass the request as is */
551 enlist(csp->headers, http->cmd);
557 /* otherwise elide the host information from the url */
559 p = strsav(p, http->gpc);
561 p = strsav(p, http->path);
563 p = strsav(p, http->ver);
564 enlist(csp->headers, p);
569 /* decide what we're to do with cookies */
571 #ifdef FEATURE_TOGGLE
572 if (!csp->toggled_on)
574 /* Most compatible set of actions (i.e. none) */
575 init_current_action(csp->action);
578 #endif /* ndef FEATURE_TOGGLE */
580 url_actions(http, csp);
583 #ifdef FEATURE_COOKIE_JAR
585 * If we're logging cookies in a cookie jar, and the user has not
586 * supplied any wafers, and the user has not told us to suppress the
587 * vanilla wafer, then send the vanilla wafer.
589 if ((csp->config->jarfile != NULL)
590 && list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
591 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
593 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
595 #endif /* def FEATURE_COOKIE_JAR */
597 #ifdef FEATURE_KILL_POPUPS
598 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
599 #endif /* def FEATURE_KILL_POPUPS */
601 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
602 ((csp->action->flags & ACTION_FILTER) != 0);
604 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
606 /* grab the rest of the client's headers */
610 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
612 n = read_socket(csp->cfd, buf, sizeof(buf));
615 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
618 add_to_iob(csp, buf, n);
622 if (p == NULL) break;
624 enlist(csp->headers, p);
628 /* We have a request. */
630 hdr = sed(client_patterns, add_client_headers, csp);
631 list_remove_all(csp->headers);
634 * Now, check to see if we need to intercept it, i.e.
639 /* a CGI call was detected and answered */
640 (NULL != (rsp = dispatch_cgi(csp)))
642 /* or we are enabled and... */
645 /* ..the request was blocked */
646 ( NULL != (rsp = block_url(csp)))
650 || ( NULL != (rsp = trust_url(csp)))
651 #endif /* def FEATURE_TRUST */
653 /* ..or a fast redirect kicked in */
654 #ifdef FEATURE_FAST_REDIRECTS
655 || (((csp->action->flags & ACTION_FAST_REDIRECTS) != 0) &&
656 (NULL != (rsp = redirect_url(csp))))
657 #endif /* def FEATURE_FAST_REDIRECTS */
661 /* Write the answer to the client */
662 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
663 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
665 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
668 #ifdef FEATURE_STATISTICS
669 /* Count as a rejected request */
671 #endif /* def FEATURE_STATISTICS */
673 /* Log (FIXME: All intercept reasons apprear as "crunch" with Status 200) */
674 log_error(LOG_LEVEL_GPC, "%s%s crunch!", http->hostport, http->path);
675 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 3", csp->ip_addr_str, http->cmd);
677 /* Clean up and return */
678 free_http_response(rsp);
683 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
685 if (fwd->forward_host)
687 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
688 fwd->forward_host, fwd->forward_port, http->hostport);
692 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
695 /* here we connect to the server, gateway, or the forwarder */
697 csp->sfd = forwarded_connect(fwd, http, csp);
701 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
706 rsp = error_response(csp, "no-such-domain", errno);
708 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
709 csp->ip_addr_str, http->cmd);
713 rsp = error_response(csp, "connect-failed", errno);
715 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
716 csp->ip_addr_str, http->cmd);
719 /* Write the answer to the client */
722 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
723 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
725 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
729 free_http_response(rsp);
734 log_error(LOG_LEVEL_CONNECT, "OK");
736 if (fwd->forward_host || (http->ssl == 0))
738 /* write the client's (modified) header to the server
739 * (along with anything else that may be in the buffer)
744 if ((write_socket(csp->sfd, hdr, n) != n)
745 || (flush_socket(csp->sfd, csp ) < 0))
747 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
750 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
751 csp->ip_addr_str, http->cmd);
753 rsp = error_response(csp, "connect-failed", errno);
757 if ((write_socket(csp->cfd, rsp->head, n) != n)
758 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
760 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
764 free_http_response(rsp);
772 * We're running an SSL tunnel and we're not forwarding,
773 * so just send the "connect succeeded" message to the
774 * client, flush the rest, and get out of the way.
776 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 2\n",
777 csp->ip_addr_str, http->cmd);
779 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0)
787 /* we're finished with the client's header */
790 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
792 /* pass data between the client and server
793 * until one or the other shuts down the connection.
802 FD_SET(csp->cfd, &rfds);
803 FD_SET(csp->sfd, &rfds);
805 n = select(maxfd+1, &rfds, NULL, NULL, NULL);
809 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
813 /* this is the body of the browser's request
814 * just read it and write it.
817 if (FD_ISSET(csp->cfd, &rfds))
819 n = read_socket(csp->cfd, buf, sizeof(buf));
823 break; /* "game over, man" */
826 if (write_socket(csp->sfd, buf, n) != n)
828 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
835 * The server wants to talk. It could be the header or the body.
836 * If `hdr' is null, then it's the header otherwise it's the body.
837 * FIXME: Does `hdr' really mean `host'? No.
841 if (FD_ISSET(csp->sfd, &rfds))
844 n = read_socket(csp->sfd, buf, sizeof(buf) - 1);
848 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
850 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
851 csp->ip_addr_str, http->cmd);
853 rsp = error_response(csp, "connect-failed", errno);
857 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
858 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
860 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
864 free_http_response(rsp);
868 /* Add a trailing zero. This lets filter_popups
869 * use string operations.
873 #ifdef FEATURE_KILL_POPUPS
874 /* Filter the popups on this read. */
875 if (block_popups_now)
879 #endif /* def FEATURE_KILL_POPUPS */
881 /* Normally, this would indicate that we've read
882 * as much as the server has sent us and we can
883 * close the client connection. However, Microsoft
884 * in its wisdom has released IIS/5 with a bug that
885 * prevents it from sending the trailing \r\n in
886 * a 302 redirect header (and possibly other headers).
887 * To work around this if we've haven't parsed
888 * a full header we'll append a trailing \r\n
889 * and see if this now generates a valid one.
891 * This hack shouldn't have any impacts. If we've
892 * already transmitted the header or if this is a
893 * SSL connection, then we won't bother with this
894 * hack. So we only work on partially received
895 * headers. If we append a \r\n and this still
896 * doesn't generate a valid header, then we won't
897 * transmit anything to the client.
902 if (server_body || http->ssl)
905 * If we have been buffering up the document,
906 * now is the time to apply content modification
907 * and send the result to the client.
912 * If the content filter fails, use the original
914 * (see p != NULL ? p : csp->iob->cur below)
916 if (NULL == (p = (*content_filter)(csp)))
918 csp->content_length = csp->iob->eod - csp->iob->cur;
921 hdr = sed(server_patterns, add_server_headers, csp);
924 if ((write_socket(csp->cfd, hdr, n) != n)
925 || (write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length) != (int)csp->content_length))
927 log_error(LOG_LEVEL_CONNECT, "write modified content to client failed: %E");
935 break; /* "game over, man" */
939 * This is NOT the body, so
940 * Let's pretend the server just sent us a blank line.
942 n = sprintf(buf, "\r\n");
945 * Now, let the normal header parsing algorithm below do its
946 * job. If it fails, we'll exit instead of continuing.
953 * If this is an SSL connection or we're in the body
954 * of the server document, just write it to the client,
955 * unless we need to buffer the body for later content-filtering
958 if (server_body || http->ssl)
962 add_to_iob(csp, buf, n);
966 if (write_socket(csp->cfd, buf, n) != n)
968 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
977 /* we're still looking for the end of the
978 * server's header ... (does that make header
979 * parsing an "out of body experience" ?
982 /* buffer up the data we just read */
983 add_to_iob(csp, buf, n);
985 /* get header lines from the iob */
987 while ((p = get_header(csp)))
991 /* see following note */
994 enlist(csp->headers, p);
998 /* NOTE: there are no "empty" headers so
999 * if the pointer `p' is not NULL we must
1000 * assume that we reached the end of the
1001 * buffer before we hit the end of the header.
1008 /* Well, we tried our MS IIS/5
1009 * hack and it didn't work.
1010 * The header is incomplete
1011 * and there isn't anything
1012 * we can do about it.
1018 /* Since we have to wait for
1019 * more from the server before
1020 * we can parse the headers
1021 * we just continue here.
1027 /* we have now received the entire header.
1028 * filter it and send the result to the client
1031 hdr = sed(server_patterns, add_server_headers, csp);
1034 /* write the server's (modified) header to
1035 * the client (along with anything else that
1036 * may be in the buffer)
1039 #ifdef FEATURE_KILL_POPUPS
1040 /* Start blocking popups if appropriate. */
1042 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1043 !http->ssl && /* We talk plaintext */
1044 block_popups) /* Policy allows */
1046 block_popups_now = 1;
1048 * Filter the part of the body that came in the same read
1049 * as the last headers:
1051 filter_popups(csp->iob->cur);
1054 #endif /* def FEATURE_KILL_POPUPS */
1056 /* Buffer and pcrs filter this if appropriate. */
1058 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1059 !http->ssl && /* We talk plaintext */
1060 pcrs_filter) /* Policy allows */
1062 content_filter = pcrs_filter_response;
1065 /* Buffer and gif_deanimate this if appropriate. */
1067 if ((csp->content_type & CT_GIF) && /* It's a image/gif MIME-Type */
1068 !http->ssl && /* We talk plaintext */
1069 gif_deanimate) /* Policy allows */
1071 content_filter = gif_deanimate_response;
1076 * Only write if we're not buffering for content modification
1078 if (!content_filter && ((write_socket(csp->cfd, hdr, n) != n)
1079 || (n = flush_socket(csp->cfd, csp) < 0)))
1081 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
1083 /* the write failed, so don't bother
1084 * mentioning it to the client...
1085 * it probably can't hear us anyway.
1091 if(!content_filter) byte_count += n;
1093 /* we're finished with the server's header */
1098 /* If this was a MS IIS/5 hack then it means
1099 * the server has already closed the
1100 * connection. Nothing more to read. Time
1111 return; /* huh? we should never get here */
1114 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
1115 csp->ip_addr_str, http->cmd, byte_count);
1119 /*********************************************************************
1123 * Description : This is little more than chat. We only "serve" to
1124 * to close any socket that chat may have opened.
1127 * 1 : csp = Current client state (buffers, headers, etc...)
1131 *********************************************************************/
1133 void serve(struct client_state *csp)
1134 #else /* ifndef AMIGA */
1135 static void serve(struct client_state *csp)
1136 #endif /* def AMIGA */
1139 close_socket(csp->cfd);
1143 close_socket(csp->sfd);
1152 /*********************************************************************
1154 * Function : server_thread
1156 * Description : We only exist to call `serve' in a threaded environment.
1159 * 1 : data = Current client state (buffers, headers, etc...)
1161 * Returns : Always 0.
1163 *********************************************************************/
1164 static int32 server_thread(void *data)
1166 serve((struct client_state *) data);
1173 /*********************************************************************
1177 * Description : Load the config file and start the listen loop.
1178 * This function is a lot more *sane* with the `load_config'
1179 * and `listen_loop' functions; although it stills does
1180 * a *little* too much for my taste.
1183 * 1 : argc = Number of parameters (including $0).
1184 * 2 : argv = Array of (char *)'s to the parameters.
1186 * Returns : 1 if : can't open config file, unrecognized directive,
1187 * stats requested in multi-thread mode, can't open the
1188 * log file, can't open the jar file, listen port is invalid,
1189 * any load fails, and can't bind port.
1191 * Else main never returns, the process must be signaled
1192 * to terminate execution. Or, on Windows, use the
1193 * "File", "Exit" menu option.
1195 *********************************************************************/
1197 int real_main(int argc, const char *argv[])
1199 int main(int argc, const char *argv[])
1204 "AmiTCP:db/junkbuster/config"
1205 #elif !defined(_WIN32)
1212 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1213 if ((argc >= 2) && (strcmp(argv[1], "--help")==0))
1215 printf("JunkBuster proxy version " VERSION ".\n\n"
1216 "Usage: %s [configfile]\n\n"
1217 "See " HOME_PAGE_URL " for details.\n"
1218 "This program is distributed under the GNU GPL, version 2 or later.\n",
1222 if ((argc >= 2) && (strcmp(argv[1], "--version")==0))
1224 printf(VERSION "\n");
1227 #endif /* !defined(_WIN32) || defined(_WIN_CONSOLE) */
1234 configfile = argv[1];
1241 #elif defined(_WIN32)
1247 signal(SIGPIPE, SIG_IGN);
1248 signal(SIGCHLD, SIG_IGN);
1250 #else /* ifdef _WIN32 */
1251 # ifdef _WIN_CONSOLE
1253 * We *are* in a windows console app.
1254 * Print a verbose messages about FAQ's and such
1256 printf(win32_blurb);
1257 # endif /* def _WIN_CONSOLE */
1258 #endif /* def _WIN32 */
1269 /*********************************************************************
1271 * Function : listen_loop
1273 * Description : bind the listen port and enter a "FOREVER" listening loop.
1279 *********************************************************************/
1280 static void listen_loop(void)
1282 struct client_state *csp = NULL;
1284 struct configuration_spec * config;
1286 config = load_config();
1288 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1289 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1291 bfd = bind_port(config->haddr, config->hport);
1295 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1296 "- There may be another junkbuster or some other "
1297 "proxy running on port %d",
1298 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1299 config->hport, config->hport
1301 /* shouldn't get here */
1305 config->need_bind = 0;
1310 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
1311 while (waitpid(-1, NULL, WNOHANG) > 0)
1313 /* zombie children */
1315 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
1318 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
1320 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
1327 csp->config = config = load_config();
1329 if ( config->need_bind )
1332 * Since we were listening to the "old port", we will not see
1333 * a "listen" param change until the next IJB request. So, at
1334 * least 1 more request must be made for us to find the new
1335 * setting. I am simply closing the old socket and binding the
1338 * Which-ever is correct, we will serve 1 more page via the
1339 * old settings. This should probably be a "show-proxy-args"
1340 * request. This should not be a so common of an operation
1341 * that this will hurt people's feelings.
1346 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1347 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1348 bfd = bind_port(config->haddr, config->hport);
1352 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1353 "- There may be another junkbuster or some other "
1354 "proxy running on port %d",
1355 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1356 config->hport, config->hport
1358 /* shouldn't get here */
1362 config->need_bind = 0;
1365 log_error(LOG_LEVEL_CONNECT, "accept connection ... ");
1367 if (!accept_connection(csp, bfd))
1369 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
1382 log_error(LOG_LEVEL_CONNECT, "OK");
1385 #ifdef FEATURE_TOGGLE
1386 /* by haroon - most of credit to srt19170 */
1387 csp->toggled_on = g_bToggleIJB;
1388 #endif /* def FEATURE_TOGGLE */
1390 if (run_loader(csp))
1392 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
1393 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1397 if (block_acl(NULL,csp))
1399 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
1400 close_socket(csp->cfd);
1404 #endif /* def FEATURE_ACL */
1406 /* add it to the list of clients */
1407 csp->next = clients->next;
1408 clients->next = csp;
1410 if (config->multi_threaded)
1414 /* this is a switch () statment in the C preprocessor - ugh */
1415 #undef SELECTED_ONE_OPTION
1417 /* Use Pthreads in preference to native code */
1418 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
1419 #define SELECTED_ONE_OPTION
1421 pthread_t the_thread;
1422 pthread_attr_t attrs;
1424 pthread_attr_init(&attrs);
1425 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
1426 child_id = (pthread_create(&the_thread, &attrs,
1427 (void*)serve, csp) ? -1 : 0);
1428 pthread_attr_destroy(&attrs);
1432 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
1433 #define SELECTED_ONE_OPTION
1434 child_id = _beginthread(
1440 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
1441 #define SELECTED_ONE_OPTION
1443 thread_id tid = spawn_thread
1444 (server_thread, "server", B_NORMAL_PRIORITY, csp);
1446 if ((tid >= 0) && (resume_thread(tid) == B_OK))
1448 child_id = (int) tid;
1457 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
1458 #define SELECTED_ONE_OPTION
1459 csp->cfd = ReleaseSocket(csp->cfd, -1);
1460 if((child_id = (int)CreateNewProcTags(
1461 NP_Entry, (ULONG)server_thread,
1462 NP_Output, Output(),
1463 NP_CloseOutput, FALSE,
1464 NP_Name, (ULONG)"junkbuster child",
1465 NP_StackSize, 200*1024,
1469 ((struct Task *)child_id)->tc_UserData = csp;
1470 Signal((struct Task *)child_id, SIGF_SINGLE);
1475 #if !defined(SELECTED_ONE_OPTION)
1478 /* This block is only needed when using fork().
1479 * When using threads, the server thread was
1480 * created and run by the call to _beginthread().
1482 if (child_id == 0) /* child */
1488 else if (child_id > 0) /* parent */
1490 /* in a fork()'d environment, the parent's
1491 * copy of the client socket and the CSP
1495 #if !defined(_WIN32) && defined(__CYGWIN__)
1497 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
1498 close_socket(csp->cfd);
1503 #undef SELECTED_ONE_OPTION
1504 /* end of cpp switch () */
1506 if (child_id < 0) /* failed */
1508 char buf[BUFFER_SIZE];
1510 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
1512 sprintf(buf , "JunkBuster: can't fork: errno = %d", errno);
1514 write_socket(csp->cfd, buf, strlen(buf));
1515 close_socket(csp->cfd);