1 const char jcc_rcs[] = "$Id: jcc.c,v 1.42 2001/09/21 23:02:02 david__schmidt 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 1.42 2001/09/21 23:02:02 david__schmidt
37 * Cleaning up 2 compiler warnings on OS/2.
39 * Revision 1.41 2001/09/16 17:05:14 jongfoster
40 * Removing unused #include showarg.h
42 * Revision 1.40 2001/09/16 15:41:45 jongfoster
43 * Fixing signed/unsigned comparison warning.
45 * Revision 1.39 2001/09/16 13:21:27 jongfoster
46 * Changes to use new list functions.
48 * Revision 1.38 2001/09/16 13:01:46 jongfoster
49 * Removing redundant function call that zeroed zalloc()'d memory.
51 * Revision 1.37 2001/09/10 11:12:24 oes
52 * Deleted unused variable
54 * Revision 1.36 2001/09/10 10:56:15 oes
55 * Silenced compiler warnings
57 * Revision 1.35 2001/07/31 14:44:22 oes
58 * Deleted unused size parameter from filter_popups()
60 * Revision 1.34 2001/07/30 22:08:36 jongfoster
61 * Tidying up #defines:
62 * - All feature #defines are now of the form FEATURE_xxx
63 * - Permanently turned off WIN_GUI_EDIT
64 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
66 * Revision 1.33 2001/07/29 19:32:00 jongfoster
67 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
69 * Revision 1.32 2001/07/29 18:47:05 jongfoster
70 * Adding missing #include "loadcfg.h"
72 * Revision 1.31 2001/07/29 12:17:48 oes
73 * Applied pthread fix by Paul Lieverse
75 * Revision 1.30 2001/07/25 22:57:13 jongfoster
76 * __BEOS__ no longer overrides FEATURE_PTHREAD.
77 * This is because FEATURE_PTHREAD will soon be widely used, so I
78 * want to keep it simple.
80 * Revision 1.29 2001/07/24 12:47:06 oes
81 * Applied BeOS support update by Eugenia
83 * Revision 1.28 2001/07/23 13:26:12 oes
84 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
86 * Revision 1.27 2001/07/19 19:09:47 haroon
87 * - Added code to take care of the situation where while processing the first
88 * server response (which includes the server header), after finding the end
89 * of the headers we were not looking past the end of the headers for
90 * content modification. I enabled it for filter_popups.
91 * Someone else should look to see if other similar operations should be
92 * done to the discarded portion of the buffer.
94 * Note 2001/07/20: No, the other content modification mechanisms will process
95 * the whole iob later anyway. --oes
97 * Revision 1.26 2001/07/18 12:31:36 oes
100 * Revision 1.25 2001/07/15 19:43:49 jongfoster
101 * Supports POSIX threads.
102 * Also removed some unused #includes.
104 * Revision 1.24 2001/07/13 14:00:40 oes
105 * - Generic content modification scheme:
106 * Each feature has its own applicability flag that is set
107 * from csp->action->flags.
108 * Replaced the "filtering" int flag , by a function pointer
109 * "content_filter" to the function that will do the content
110 * modification. If it is != NULL, the document will be buffered
111 * and processed through *content_filter, which must set
112 * csp->content_length and return a modified copy of the body
113 * or return NULL (on failiure).
114 * - Changed csp->is_text to the more generic bitmap csp->content_type
115 * which can currently take the valued CT_TEXT or CT_GIF
117 * - Removed all #ifdef PCRS
119 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
120 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
121 * the `block_acl' call. This prevents a compilation error when the user
122 * does not wish to use the "ACL" feature.
124 * Revision 1.22 2001/06/29 21:45:41 oes
125 * Indentation, CRLF->LF, Tab-> Space
127 * Revision 1.21 2001/06/29 13:29:36 oes
128 * - Cleaned up, improved comments
129 * - Unified all possible interceptors (CGI,
130 * block, trust, fast_redirect) in one
131 * place, with one (CGI) answer generation
132 * mechansim. Much clearer now.
133 * - Removed the GIF image generation, which
134 * is now done in filters.c:block_url()
135 * - Made error conditions like domain lookup
136 * failiure or (various) problems while talking
137 * to the server use cgi.c:error_response()
138 * instead of generating HTML/HTTP in chat() (yuck!)
139 * - Removed logentry from cancelled commit
141 * Revision 1.20 2001/06/09 10:55:28 jongfoster
142 * Changing BUFSIZ ==> BUFFER_SIZE
144 * Revision 1.19 2001/06/07 23:12:52 jongfoster
145 * Replacing function pointer in struct gateway with a directly
146 * called function forwarded_connect().
147 * Replacing struct gateway with struct forward_spec
149 * Revision 1.18 2001/06/03 19:12:16 oes
150 * introduced new cgi handling
152 * Revision 1.17 2001/06/01 20:07:23 jongfoster
153 * Now uses action +image-blocker{} rather than config->tinygif
155 * Revision 1.16 2001/06/01 18:49:17 jongfoster
156 * Replaced "list_share" with "list" - the tiny memory gain was not
157 * worth the extra complexity.
159 * Revision 1.15 2001/05/31 21:24:47 jongfoster
160 * Changed "permission" to "action" throughout.
161 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
162 * Moved vanilla wafer check into chat(), since we must now
163 * decide whether or not to add it based on the URL.
165 * Revision 1.14 2001/05/29 20:14:01 joergs
166 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
169 * Revision 1.13 2001/05/29 09:50:24 jongfoster
170 * Unified blocklist/imagelist/permissionslist.
171 * File format is still under discussion, but the internal changes
174 * Also modified interceptor behaviour:
175 * - We now intercept all URLs beginning with one of the following
176 * prefixes (and *only* these prefixes):
178 * * http://ijbswa.sf.net/config/
179 * * http://ijbswa.sourceforge.net/config/
180 * - New interceptors "home page" - go to http://i.j.b/ to see it.
181 * - Internal changes so that intercepted and fast redirect pages
182 * are not replaced with an image.
183 * - Interceptors now have the option to send a binary page direct
184 * to the client. (i.e. ijb-send-banner uses this)
185 * - Implemented show-url-info interceptor. (Which is why I needed
186 * the above interceptors changes - a typical URL is
187 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
188 * The previous mechanism would not have intercepted that, and
189 * if it had been intercepted then it then it would have replaced
192 * Revision 1.12 2001/05/27 22:17:04 oes
194 * - re_process_buffer no longer writes the modified buffer
195 * to the client, which was very ugly. It now returns the
196 * buffer, which it is then written by chat.
198 * - content_length now adjusts the Content-Length: header
199 * for modified documents rather than crunch()ing it.
200 * (Length info in csp->content_length, which is 0 for
201 * unmodified documents)
203 * - For this to work, sed() is called twice when filtering.
205 * Revision 1.11 2001/05/26 17:27:53 jongfoster
206 * Added support for CLF and fixed LOG_LEVEL_LOG.
207 * Also did CRLF->LF fix of my previous patch.
209 * Revision 1.10 2001/05/26 15:26:15 jongfoster
210 * ACL feature now provides more security by immediately dropping
211 * connections from untrusted hosts.
213 * Revision 1.9 2001/05/26 00:28:36 jongfoster
214 * Automatic reloading of config file.
215 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
216 * Most of the global variables have been moved to a new
217 * struct configuration_spec, accessed through csp->config->globalname
218 * Most of the globals remaining are used by the Win32 GUI.
220 * Revision 1.8 2001/05/25 22:43:18 jongfoster
221 * Fixing minor memory leak and buffer overflow.
223 * Revision 1.7 2001/05/25 22:34:30 jongfoster
226 * Revision 1.6 2001/05/23 00:13:58 joergs
227 * AmigaOS support fixed.
229 * Revision 1.5 2001/05/22 18:46:04 oes
231 * - Enabled filtering banners by size rather than URL
232 * by adding patterns that replace all standard banner
233 * sizes with the "Junkbuster" gif to the re_filterfile
235 * - Enabled filtering WebBugs by providing a pattern
236 * which kills all 1x1 images
238 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
239 * which is selected by the (nonstandard and therefore
240 * capital) letter 'U' in the option string.
241 * It causes the quantifiers to be ungreedy by default.
242 * Appending a ? turns back to greedy (!).
244 * - Added a new interceptor ijb-send-banner, which
245 * sends back the "Junkbuster" gif. Without imagelist or
246 * MSIE detection support, or if tinygif = 1, or the
247 * URL isn't recognized as an imageurl, a lame HTML
248 * explanation is sent instead.
250 * - Added new feature, which permits blocking remote
251 * script redirects and firing back a local redirect
253 * The feature is conditionally compiled, i.e. it
254 * can be disabled with --disable-fast-redirects,
255 * plus it must be activated by a "fast-redirects"
256 * line in the config file, has its own log level
257 * and of course wants to be displayed by show-proxy-args
258 * Note: Boy, all the #ifdefs in 1001 locations and
259 * all the fumbling with configure.in and acconfig.h
260 * were *way* more work than the feature itself :-(
262 * - Because a generic redirect template was needed for
263 * this, tinygif = 3 now uses the same.
265 * - Moved GIFs, and other static HTTP response templates
270 * - Removed some >400 CRs again (Jon, you really worked
273 * Revision 1.4 2001/05/21 19:34:01 jongfoster
274 * Made failure to bind() a fatal error.
276 * Revision 1.3 2001/05/20 01:21:20 jongfoster
277 * Version 2.9.4 checkin.
278 * - Merged popupfile and cookiefile, and added control over PCRS
279 * filtering, in new "permissionsfile".
280 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
281 * file error you now get a message box (in the Win32 GUI) rather
282 * than the program exiting with no explanation.
283 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
285 * - Removed tabs from "config"
286 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
287 * - Bumped up version number.
289 * Revision 1.2 2001/05/17 22:34:44 oes
290 * - Added hint on GIF char array generation to jcc.c
291 * - Cleaned CRLF's from the sources and related files
292 * - Repaired logging for REF and FRC
294 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
295 * Initial import of version 2.9.3 source tree
298 *********************************************************************/
304 #include <sys/types.h>
311 #ifdef FEATURE_PTHREAD
313 #endif /* def FEATURE_PTHREAD */
316 # ifndef FEATURE_PTHREAD
317 # include <windows.h>
318 # include <process.h>
319 # endif /* ndef FEATURE_PTHREAD */
322 # ifndef _WIN_CONSOLE
324 # endif /* ndef _WIN_CONSOLE */
326 #else /* ifndef _WIN32 */
329 # include <sys/time.h>
330 # include <sys/wait.h>
331 # include <sys/stat.h>
335 # include <socket.h> /* BeOS has select() for sockets only. */
336 # include <OS.h> /* declarations for threads and stuff. */
340 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
355 #include "killpopup.h"
356 #include "miscutil.h"
358 #include "jbsockets.h"
364 const char jcc_h_rcs[] = JCC_H_VERSION;
365 const char project_h_rcs[] = PROJECT_H_VERSION;
367 struct client_state clients[1];
368 struct file_list files[1];
370 #ifdef FEATURE_STATISTICS
371 int urls_read = 0; /* total nr of urls read inc rejected */
372 int urls_rejected = 0; /* total nr of urls rejected */
373 #endif /* def FEATURE_STATISTICS */
376 static void listen_loop(void);
377 static void chat(struct client_state *csp);
379 void serve(struct client_state *csp);
380 #else /* ifndef AMIGA */
381 static void serve(struct client_state *csp);
382 #endif /* def AMIGA */
385 static int32 server_thread(void *data);
386 #endif /* def __BEOS__ */
389 #define sleep(N) Sleep(((N) * 1000))
393 /* The vanilla wafer. */
394 static const char VANILLA_WAFER[] =
395 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
396 "Do_not_send_me_any_copyrighted_information_other_than_the_"
397 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
398 "In_particular_do_not_send_me_any_cookies_that_"
399 "are_subject_to_a_claim_of_copyright_by_anybody._"
400 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
401 "(copyright_or_otherwise)_applying_to_any_cookie._";
404 /*********************************************************************
408 * Description : Once a connection to the client has been accepted,
409 * this function is called (via serve()) to handle the
410 * main business of the communication. When this
411 * function returns, the caller must close the client
415 * 1 : csp = Current client state (buffers, headers, etc...)
417 * Returns : On success, the number of bytes written are returned (zero
418 * indicates nothing was written). On error, -1 is returned,
419 * and errno is set appropriately. If count is zero and the
420 * file descriptor refers to a regular file, 0 will be
421 * returned without causing any other effect. For a special
422 * file, the results are not portable.
424 *********************************************************************/
425 static void chat(struct client_state *csp)
428 * This next lines are a little ugly, but they simplifies the if statements
429 * below. Basically if TOGGLE, then we want the if to test "csp->toggled_on",
430 * else we don't. And if FEATURE_FORCE_LOAD, then we want the if to test
431 * "csp->toggled_on", else we don't
433 #ifdef FEATURE_TOGGLE
434 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
435 #else /* ifndef FEATURE_TOGGLE */
436 # define IS_TOGGLED_ON_AND
437 #endif /* ndef FEATURE_TOGGLE */
438 #ifdef FEATURE_FORCE_LOAD
439 # define IS_NOT_FORCED_AND (!csp->force) &&
440 #else /* ifndef FEATURE_FORCE_LOAD */
441 # define IS_NOT_FORCED_AND
442 #endif /* def FEATURE_FORCE_LOAD */
444 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
446 char buf[BUFFER_SIZE];
449 int n, maxfd, server_body;
450 int ms_iis5_hack = 0;
452 const struct forward_spec * fwd;
453 struct http_request *http;
454 #ifdef FEATURE_KILL_POPUPS
455 int block_popups; /* bool, 1==will block popups */
456 int block_popups_now = 0; /* bool, 1==currently blocking popups */
457 #endif /* def FEATURE_KILL_POPUPS */
459 int pcrs_filter; /* bool, 1==will filter through pcrs */
460 int gif_deanimate; /* bool, 1==will deanimate gifs */
462 /* Function that does the content filtering for the current request */
463 char *(*content_filter)() = NULL;
465 /* Skeleton for HTTP response, if we should intercept the request */
466 struct http_response *rsp;
471 * Read the client's request. Note that since we're not using select() we
472 * could get blocked here if a client connected, then didn't say anything!
477 n = read_socket(csp->cfd, buf, sizeof(buf));
479 if (n <= 0) break; /* error! */
481 add_to_iob(csp, buf, n);
483 req = get_header(csp);
487 break; /* no HTTP request! */
492 continue; /* more to come! */
495 #ifdef FEATURE_FORCE_LOAD
496 /* If this request contains the FORCE_PREFIX,
497 * better get rid of it now and set the force flag --oes
500 if (strstr(req, FORCE_PREFIX))
502 strclean(req, FORCE_PREFIX);
503 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
510 #endif /* def FEATURE_FORCE_LOAD */
512 parse_http_request(req, http, csp);
517 if (http->cmd == NULL)
519 strcpy(buf, CHEADER);
520 write_socket(csp->cfd, buf, strlen(buf));
522 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
527 /* decide how to route the HTTP request */
529 if ((fwd = forward_url(http, csp)) == NULL)
531 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
532 /* Never get here - LOG_LEVEL_FATAL causes program exit */
535 /* build the http request to send to the server
536 * we have to do one of the following:
538 * create = use the original HTTP request to create a new
539 * HTTP request that has only the path component
540 * without the http://domainspec
541 * pass = pass the original HTTP request unchanged
543 * drop = drop the HTTP request
548 * +--------+--------+
550 * 0 | create | drop |
552 * Forwarding +--------+--------+
556 * +--------+--------+
560 if (fwd->forward_host)
562 /* if forwarding, just pass the request as is */
563 enlist(csp->headers, http->cmd);
569 /* otherwise elide the host information from the url */
571 p = strsav(p, http->gpc);
573 p = strsav(p, http->path);
575 p = strsav(p, http->ver);
576 enlist(csp->headers, p);
581 /* decide what we're to do with cookies */
583 #ifdef FEATURE_TOGGLE
584 if (!csp->toggled_on)
586 /* Most compatible set of actions (i.e. none) */
587 init_current_action(csp->action);
590 #endif /* ndef FEATURE_TOGGLE */
592 url_actions(http, csp);
595 #ifdef FEATURE_COOKIE_JAR
597 * If we're logging cookies in a cookie jar, and the user has not
598 * supplied any wafers, and the user has not told us to suppress the
599 * vanilla wafer, then send the vanilla wafer.
601 if ((csp->config->jarfile != NULL)
602 && list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
603 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
605 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
607 #endif /* def FEATURE_COOKIE_JAR */
609 #ifdef FEATURE_KILL_POPUPS
610 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
611 #endif /* def FEATURE_KILL_POPUPS */
613 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
614 ((csp->action->flags & ACTION_FILTER) != 0);
616 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
618 /* grab the rest of the client's headers */
622 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
624 n = read_socket(csp->cfd, buf, sizeof(buf));
627 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
630 add_to_iob(csp, buf, n);
634 if (p == NULL) break;
636 enlist(csp->headers, p);
640 /* We have a request. */
643 * Now, check to see if we need to intercept it, i.e.
648 /* a CGI call was detected and answered */
649 (NULL != (rsp = dispatch_cgi(csp)))
651 /* or we are enabled and... */
654 /* ..the request was blocked */
655 ( NULL != (rsp = block_url(csp)))
659 || ( NULL != (rsp = trust_url(csp)))
660 #endif /* def FEATURE_TRUST */
662 /* ..or a fast redirect kicked in */
663 #ifdef FEATURE_FAST_REDIRECTS
664 || (((csp->action->flags & ACTION_FAST_REDIRECTS) != 0) &&
665 (NULL != (rsp = redirect_url(csp))))
666 #endif /* def FEATURE_FAST_REDIRECTS */
670 /* Write the answer to the client */
671 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
672 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
674 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
677 #ifdef FEATURE_STATISTICS
678 /* Count as a rejected request */
680 #endif /* def FEATURE_STATISTICS */
682 /* Log (FIXME: All intercept reasons apprear as "crunch" with Status 200) */
683 log_error(LOG_LEVEL_GPC, "%s%s crunch!", http->hostport, http->path);
684 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 3", csp->ip_addr_str, http->cmd);
686 /* Clean up and return */
687 free_http_response(rsp);
691 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
693 if (fwd->forward_host)
695 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
696 fwd->forward_host, fwd->forward_port, http->hostport);
700 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
703 /* here we connect to the server, gateway, or the forwarder */
705 csp->sfd = forwarded_connect(fwd, http, csp);
709 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
714 rsp = error_response(csp, "no-such-domain", errno);
716 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
717 csp->ip_addr_str, http->cmd);
721 rsp = error_response(csp, "connect-failed", errno);
723 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
724 csp->ip_addr_str, http->cmd);
727 /* Write the answer to the client */
730 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
731 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
733 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
737 free_http_response(rsp);
741 log_error(LOG_LEVEL_CONNECT, "OK");
743 hdr = sed(client_patterns, add_client_headers, csp);
745 if (fwd->forward_host || (http->ssl == 0))
747 /* write the client's (modified) header to the server
748 * (along with anything else that may be in the buffer)
753 if ((write_socket(csp->sfd, hdr, n) != n)
754 || (flush_socket(csp->sfd, csp ) < 0))
756 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
759 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
760 csp->ip_addr_str, http->cmd);
762 rsp = error_response(csp, "connect-failed", errno);
766 if ((write_socket(csp->cfd, rsp->head, n) != n)
767 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
769 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
773 free_http_response(rsp);
781 * We're running an SSL tunnel and we're not forwarding,
782 * so just send the "connect succeeded" message to the
783 * client, flush the rest, and get out of the way.
785 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 2\n",
786 csp->ip_addr_str, http->cmd);
788 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0)
796 /* we're finished with the client's header */
799 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
801 /* pass data between the client and server
802 * until one or the other shuts down the connection.
811 FD_SET(csp->cfd, &rfds);
812 FD_SET(csp->sfd, &rfds);
814 n = select(maxfd+1, &rfds, NULL, NULL, NULL);
818 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
822 /* this is the body of the browser's request
823 * just read it and write it.
826 if (FD_ISSET(csp->cfd, &rfds))
828 n = read_socket(csp->cfd, buf, sizeof(buf));
832 break; /* "game over, man" */
835 if (write_socket(csp->sfd, buf, n) != n)
837 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
844 * The server wants to talk. It could be the header or the body.
845 * If `hdr' is null, then it's the header otherwise it's the body.
846 * FIXME: Does `hdr' really mean `host'? No.
850 if (FD_ISSET(csp->sfd, &rfds))
853 n = read_socket(csp->sfd, buf, sizeof(buf) - 1);
857 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
859 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
860 csp->ip_addr_str, http->cmd);
862 rsp = error_response(csp, "connect-failed", errno);
866 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
867 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
869 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
873 free_http_response(rsp);
877 /* Add a trailing zero. This lets filter_popups
878 * use string operations.
882 #ifdef FEATURE_KILL_POPUPS
883 /* Filter the popups on this read. */
884 if (block_popups_now)
888 #endif /* def FEATURE_KILL_POPUPS */
890 /* Normally, this would indicate that we've read
891 * as much as the server has sent us and we can
892 * close the client connection. However, Microsoft
893 * in its wisdom has released IIS/5 with a bug that
894 * prevents it from sending the trailing \r\n in
895 * a 302 redirect header (and possibly other headers).
896 * To work around this if we've haven't parsed
897 * a full header we'll append a trailing \r\n
898 * and see if this now generates a valid one.
900 * This hack shouldn't have any impacts. If we've
901 * already transmitted the header or if this is a
902 * SSL connection, then we won't bother with this
903 * hack. So we only work on partially received
904 * headers. If we append a \r\n and this still
905 * doesn't generate a valid header, then we won't
906 * transmit anything to the client.
911 if (server_body || http->ssl)
914 * If we have been buffering up the document,
915 * now is the time to apply content modification
916 * and send the result to the client.
921 * If the content filter fails, use the original
923 * (see p != NULL ? p : csp->iob->cur below)
925 if (NULL == (p = (*content_filter)(csp)))
927 csp->content_length = csp->iob->eod - csp->iob->cur;
930 hdr = sed(server_patterns, add_server_headers, csp);
933 if ((write_socket(csp->cfd, hdr, n) != n)
934 || (write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length) != (int)csp->content_length))
936 log_error(LOG_LEVEL_CONNECT, "write modified content to client failed: %E");
944 break; /* "game over, man" */
948 * This is NOT the body, so
949 * Let's pretend the server just sent us a blank line.
951 n = sprintf(buf, "\r\n");
954 * Now, let the normal header parsing algorithm below do its
955 * job. If it fails, we'll exit instead of continuing.
962 * If this is an SSL connection or we're in the body
963 * of the server document, just write it to the client,
964 * unless we need to buffer the body for later content-filtering
967 if (server_body || http->ssl)
971 add_to_iob(csp, buf, n);
975 if (write_socket(csp->cfd, buf, n) != n)
977 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
986 /* we're still looking for the end of the
987 * server's header ... (does that make header
988 * parsing an "out of body experience" ?
991 /* buffer up the data we just read */
992 add_to_iob(csp, buf, n);
994 /* get header lines from the iob */
996 while ((p = get_header(csp)))
1000 /* see following note */
1003 enlist(csp->headers, p);
1007 /* NOTE: there are no "empty" headers so
1008 * if the pointer `p' is not NULL we must
1009 * assume that we reached the end of the
1010 * buffer before we hit the end of the header.
1017 /* Well, we tried our MS IIS/5
1018 * hack and it didn't work.
1019 * The header is incomplete
1020 * and there isn't anything
1021 * we can do about it.
1027 /* Since we have to wait for
1028 * more from the server before
1029 * we can parse the headers
1030 * we just continue here.
1036 /* we have now received the entire header.
1037 * filter it and send the result to the client
1040 hdr = sed(server_patterns, add_server_headers, csp);
1043 /* write the server's (modified) header to
1044 * the client (along with anything else that
1045 * may be in the buffer)
1048 #ifdef FEATURE_KILL_POPUPS
1049 /* Start blocking popups if appropriate. */
1051 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1052 !http->ssl && /* We talk plaintext */
1053 block_popups) /* Policy allows */
1055 block_popups_now = 1;
1057 * Filter the part of the body that came in the same read
1058 * as the last headers:
1060 filter_popups(csp->iob->cur);
1063 #endif /* def FEATURE_KILL_POPUPS */
1065 /* Buffer and pcrs filter this if appropriate. */
1067 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1068 !http->ssl && /* We talk plaintext */
1069 pcrs_filter) /* Policy allows */
1071 content_filter = pcrs_filter_response;
1074 /* Buffer and gif_deanimate this if appropriate. */
1076 if ((csp->content_type & CT_GIF) && /* It's a image/gif MIME-Type */
1077 !http->ssl && /* We talk plaintext */
1078 gif_deanimate) /* Policy allows */
1080 content_filter = gif_deanimate_response;
1085 * Only write if we're not buffering for content modification
1087 if (!content_filter && ((write_socket(csp->cfd, hdr, n) != n)
1088 || (n = flush_socket(csp->cfd, csp) < 0)))
1090 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
1092 /* the write failed, so don't bother
1093 * mentioning it to the client...
1094 * it probably can't hear us anyway.
1100 if(!content_filter) byte_count += n;
1102 /* we're finished with the server's header */
1107 /* If this was a MS IIS/5 hack then it means
1108 * the server has already closed the
1109 * connection. Nothing more to read. Time
1120 return; /* huh? we should never get here */
1123 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
1124 csp->ip_addr_str, http->cmd, byte_count);
1128 /*********************************************************************
1132 * Description : This is little more than chat. We only "serve" to
1133 * to close any socket that chat may have opened.
1136 * 1 : csp = Current client state (buffers, headers, etc...)
1140 *********************************************************************/
1142 void serve(struct client_state *csp)
1143 #else /* ifndef AMIGA */
1144 static void serve(struct client_state *csp)
1145 #endif /* def AMIGA */
1148 close_socket(csp->cfd);
1152 close_socket(csp->sfd);
1161 /*********************************************************************
1163 * Function : server_thread
1165 * Description : We only exist to call `serve' in a threaded environment.
1168 * 1 : data = Current client state (buffers, headers, etc...)
1170 * Returns : Always 0.
1172 *********************************************************************/
1173 static int32 server_thread(void *data)
1175 serve((struct client_state *) data);
1182 /*********************************************************************
1186 * Description : Load the config file and start the listen loop.
1187 * This function is a lot more *sane* with the `load_config'
1188 * and `listen_loop' functions; although it stills does
1189 * a *little* too much for my taste.
1192 * 1 : argc = Number of parameters (including $0).
1193 * 2 : argv = Array of (char *)'s to the parameters.
1195 * Returns : 1 if : can't open config file, unrecognized directive,
1196 * stats requested in multi-thread mode, can't open the
1197 * log file, can't open the jar file, listen port is invalid,
1198 * any load fails, and can't bind port.
1200 * Else main never returns, the process must be signaled
1201 * to terminate execution. Or, on Windows, use the
1202 * "File", "Exit" menu option.
1204 *********************************************************************/
1206 int real_main(int argc, const char *argv[])
1208 int main(int argc, const char *argv[])
1213 "AmiTCP:db/junkbuster/config"
1214 #elif !defined(_WIN32)
1221 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1222 if ((argc >= 2) && (strcmp(argv[1], "--help")==0))
1224 printf("JunkBuster proxy version " VERSION ".\n\n"
1225 "Usage: %s [configfile]\n\n"
1226 "See " HOME_PAGE_URL " for details.\n"
1227 "This program is distributed under the GNU GPL, version 2 or later.\n",
1231 if ((argc >= 2) && (strcmp(argv[1], "--version")==0))
1233 printf(VERSION "\n");
1236 #endif /* !defined(_WIN32) || defined(_WIN_CONSOLE) */
1243 configfile = argv[1];
1250 #elif defined(_WIN32)
1256 signal(SIGPIPE, SIG_IGN);
1257 signal(SIGCHLD, SIG_IGN);
1259 #else /* ifdef _WIN32 */
1260 # ifdef _WIN_CONSOLE
1262 * We *are* in a windows console app.
1263 * Print a verbose messages about FAQ's and such
1265 printf(win32_blurb);
1266 # endif /* def _WIN_CONSOLE */
1267 #endif /* def _WIN32 */
1278 /*********************************************************************
1280 * Function : listen_loop
1282 * Description : bind the listen port and enter a "FOREVER" listening loop.
1288 *********************************************************************/
1289 static void listen_loop(void)
1291 struct client_state *csp = NULL;
1293 struct configuration_spec * config;
1295 config = load_config();
1297 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1298 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1300 bfd = bind_port(config->haddr, config->hport);
1304 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1305 "- There may be another junkbuster or some other "
1306 "proxy running on port %d",
1307 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1308 config->hport, config->hport
1310 /* shouldn't get here */
1314 config->need_bind = 0;
1319 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
1320 while (waitpid(-1, NULL, WNOHANG) > 0)
1322 /* zombie children */
1324 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
1327 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
1329 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
1336 csp->config = config = load_config();
1338 if ( config->need_bind )
1341 * Since we were listening to the "old port", we will not see
1342 * a "listen" param change until the next IJB request. So, at
1343 * least 1 more request must be made for us to find the new
1344 * setting. I am simply closing the old socket and binding the
1347 * Which-ever is correct, we will serve 1 more page via the
1348 * old settings. This should probably be a "show-proxy-args"
1349 * request. This should not be a so common of an operation
1350 * that this will hurt people's feelings.
1355 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1356 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1357 bfd = bind_port(config->haddr, config->hport);
1361 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1362 "- There may be another junkbuster or some other "
1363 "proxy running on port %d",
1364 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1365 config->hport, config->hport
1367 /* shouldn't get here */
1371 config->need_bind = 0;
1374 log_error(LOG_LEVEL_CONNECT, "accept connection ... ");
1376 if (!accept_connection(csp, bfd))
1378 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
1391 log_error(LOG_LEVEL_CONNECT, "OK");
1394 #ifdef FEATURE_TOGGLE
1395 /* by haroon - most of credit to srt19170 */
1396 csp->toggled_on = g_bToggleIJB;
1397 #endif /* def FEATURE_TOGGLE */
1399 if (run_loader(csp))
1401 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
1402 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1406 if (block_acl(NULL,csp))
1408 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
1409 close_socket(csp->cfd);
1413 #endif /* def FEATURE_ACL */
1415 /* add it to the list of clients */
1416 csp->next = clients->next;
1417 clients->next = csp;
1419 if (config->multi_threaded)
1423 /* this is a switch () statment in the C preprocessor - ugh */
1424 #undef SELECTED_ONE_OPTION
1426 /* Use Pthreads in preference to native code */
1427 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
1428 #define SELECTED_ONE_OPTION
1430 pthread_t the_thread;
1431 pthread_attr_t attrs;
1433 pthread_attr_init(&attrs);
1434 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
1435 child_id = (pthread_create(&the_thread, &attrs,
1436 (void*)serve, csp) ? -1 : 0);
1437 pthread_attr_destroy(&attrs);
1441 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
1442 #define SELECTED_ONE_OPTION
1443 child_id = _beginthread(
1449 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
1450 #define SELECTED_ONE_OPTION
1452 thread_id tid = spawn_thread
1453 (server_thread, "server", B_NORMAL_PRIORITY, csp);
1455 if ((tid >= 0) && (resume_thread(tid) == B_OK))
1457 child_id = (int) tid;
1466 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
1467 #define SELECTED_ONE_OPTION
1468 csp->cfd = ReleaseSocket(csp->cfd, -1);
1469 if((child_id = (int)CreateNewProcTags(
1470 NP_Entry, (ULONG)server_thread,
1471 NP_Output, Output(),
1472 NP_CloseOutput, FALSE,
1473 NP_Name, (ULONG)"junkbuster child",
1474 NP_StackSize, 200*1024,
1478 ((struct Task *)child_id)->tc_UserData = csp;
1479 Signal((struct Task *)child_id, SIGF_SINGLE);
1484 #if !defined(SELECTED_ONE_OPTION)
1487 /* This block is only needed when using fork().
1488 * When using threads, the server thread was
1489 * created and run by the call to _beginthread().
1491 if (child_id == 0) /* child */
1497 else if (child_id > 0) /* parent */
1499 /* in a fork()'d environment, the parent's
1500 * copy of the client socket and the CSP
1504 #if !defined(_WIN32) && defined(__CYGWIN__)
1506 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
1507 close_socket(csp->cfd);
1512 #undef SELECTED_ONE_OPTION
1513 /* end of cpp switch () */
1515 if (child_id < 0) /* failed */
1517 char buf[BUFFER_SIZE];
1519 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
1521 sprintf(buf , "JunkBuster: can't fork: errno = %d", errno);
1523 write_socket(csp->cfd, buf, strlen(buf));
1524 close_socket(csp->cfd);