1 const char jcc_rcs[] = "$Id: jcc.c,v 1.41 2001/09/16 17:05:14 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 1.41 2001/09/16 17:05:14 jongfoster
37 * Removing unused #include showarg.h
39 * Revision 1.40 2001/09/16 15:41:45 jongfoster
40 * Fixing signed/unsigned comparison warning.
42 * Revision 1.39 2001/09/16 13:21:27 jongfoster
43 * Changes to use new list functions.
45 * Revision 1.38 2001/09/16 13:01:46 jongfoster
46 * Removing redundant function call that zeroed zalloc()'d memory.
48 * Revision 1.37 2001/09/10 11:12:24 oes
49 * Deleted unused variable
51 * Revision 1.36 2001/09/10 10:56:15 oes
52 * Silenced compiler warnings
54 * Revision 1.35 2001/07/31 14:44:22 oes
55 * Deleted unused size parameter from filter_popups()
57 * Revision 1.34 2001/07/30 22:08:36 jongfoster
58 * Tidying up #defines:
59 * - All feature #defines are now of the form FEATURE_xxx
60 * - Permanently turned off WIN_GUI_EDIT
61 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
63 * Revision 1.33 2001/07/29 19:32:00 jongfoster
64 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
66 * Revision 1.32 2001/07/29 18:47:05 jongfoster
67 * Adding missing #include "loadcfg.h"
69 * Revision 1.31 2001/07/29 12:17:48 oes
70 * Applied pthread fix by Paul Lieverse
72 * Revision 1.30 2001/07/25 22:57:13 jongfoster
73 * __BEOS__ no longer overrides FEATURE_PTHREAD.
74 * This is because FEATURE_PTHREAD will soon be widely used, so I
75 * want to keep it simple.
77 * Revision 1.29 2001/07/24 12:47:06 oes
78 * Applied BeOS support update by Eugenia
80 * Revision 1.28 2001/07/23 13:26:12 oes
81 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
83 * Revision 1.27 2001/07/19 19:09:47 haroon
84 * - Added code to take care of the situation where while processing the first
85 * server response (which includes the server header), after finding the end
86 * of the headers we were not looking past the end of the headers for
87 * content modification. I enabled it for filter_popups.
88 * Someone else should look to see if other similar operations should be
89 * done to the discarded portion of the buffer.
91 * Note 2001/07/20: No, the other content modification mechanisms will process
92 * the whole iob later anyway. --oes
94 * Revision 1.26 2001/07/18 12:31:36 oes
97 * Revision 1.25 2001/07/15 19:43:49 jongfoster
98 * Supports POSIX threads.
99 * Also removed some unused #includes.
101 * Revision 1.24 2001/07/13 14:00:40 oes
102 * - Generic content modification scheme:
103 * Each feature has its own applicability flag that is set
104 * from csp->action->flags.
105 * Replaced the "filtering" int flag , by a function pointer
106 * "content_filter" to the function that will do the content
107 * modification. If it is != NULL, the document will be buffered
108 * and processed through *content_filter, which must set
109 * csp->content_length and return a modified copy of the body
110 * or return NULL (on failiure).
111 * - Changed csp->is_text to the more generic bitmap csp->content_type
112 * which can currently take the valued CT_TEXT or CT_GIF
114 * - Removed all #ifdef PCRS
116 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
117 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
118 * the `block_acl' call. This prevents a compilation error when the user
119 * does not wish to use the "ACL" feature.
121 * Revision 1.22 2001/06/29 21:45:41 oes
122 * Indentation, CRLF->LF, Tab-> Space
124 * Revision 1.21 2001/06/29 13:29:36 oes
125 * - Cleaned up, improved comments
126 * - Unified all possible interceptors (CGI,
127 * block, trust, fast_redirect) in one
128 * place, with one (CGI) answer generation
129 * mechansim. Much clearer now.
130 * - Removed the GIF image generation, which
131 * is now done in filters.c:block_url()
132 * - Made error conditions like domain lookup
133 * failiure or (various) problems while talking
134 * to the server use cgi.c:error_response()
135 * instead of generating HTML/HTTP in chat() (yuck!)
136 * - Removed logentry from cancelled commit
138 * Revision 1.20 2001/06/09 10:55:28 jongfoster
139 * Changing BUFSIZ ==> BUFFER_SIZE
141 * Revision 1.19 2001/06/07 23:12:52 jongfoster
142 * Replacing function pointer in struct gateway with a directly
143 * called function forwarded_connect().
144 * Replacing struct gateway with struct forward_spec
146 * Revision 1.18 2001/06/03 19:12:16 oes
147 * introduced new cgi handling
149 * Revision 1.17 2001/06/01 20:07:23 jongfoster
150 * Now uses action +image-blocker{} rather than config->tinygif
152 * Revision 1.16 2001/06/01 18:49:17 jongfoster
153 * Replaced "list_share" with "list" - the tiny memory gain was not
154 * worth the extra complexity.
156 * Revision 1.15 2001/05/31 21:24:47 jongfoster
157 * Changed "permission" to "action" throughout.
158 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
159 * Moved vanilla wafer check into chat(), since we must now
160 * decide whether or not to add it based on the URL.
162 * Revision 1.14 2001/05/29 20:14:01 joergs
163 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
166 * Revision 1.13 2001/05/29 09:50:24 jongfoster
167 * Unified blocklist/imagelist/permissionslist.
168 * File format is still under discussion, but the internal changes
171 * Also modified interceptor behaviour:
172 * - We now intercept all URLs beginning with one of the following
173 * prefixes (and *only* these prefixes):
175 * * http://ijbswa.sf.net/config/
176 * * http://ijbswa.sourceforge.net/config/
177 * - New interceptors "home page" - go to http://i.j.b/ to see it.
178 * - Internal changes so that intercepted and fast redirect pages
179 * are not replaced with an image.
180 * - Interceptors now have the option to send a binary page direct
181 * to the client. (i.e. ijb-send-banner uses this)
182 * - Implemented show-url-info interceptor. (Which is why I needed
183 * the above interceptors changes - a typical URL is
184 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
185 * The previous mechanism would not have intercepted that, and
186 * if it had been intercepted then it then it would have replaced
189 * Revision 1.12 2001/05/27 22:17:04 oes
191 * - re_process_buffer no longer writes the modified buffer
192 * to the client, which was very ugly. It now returns the
193 * buffer, which it is then written by chat.
195 * - content_length now adjusts the Content-Length: header
196 * for modified documents rather than crunch()ing it.
197 * (Length info in csp->content_length, which is 0 for
198 * unmodified documents)
200 * - For this to work, sed() is called twice when filtering.
202 * Revision 1.11 2001/05/26 17:27:53 jongfoster
203 * Added support for CLF and fixed LOG_LEVEL_LOG.
204 * Also did CRLF->LF fix of my previous patch.
206 * Revision 1.10 2001/05/26 15:26:15 jongfoster
207 * ACL feature now provides more security by immediately dropping
208 * connections from untrusted hosts.
210 * Revision 1.9 2001/05/26 00:28:36 jongfoster
211 * Automatic reloading of config file.
212 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
213 * Most of the global variables have been moved to a new
214 * struct configuration_spec, accessed through csp->config->globalname
215 * Most of the globals remaining are used by the Win32 GUI.
217 * Revision 1.8 2001/05/25 22:43:18 jongfoster
218 * Fixing minor memory leak and buffer overflow.
220 * Revision 1.7 2001/05/25 22:34:30 jongfoster
223 * Revision 1.6 2001/05/23 00:13:58 joergs
224 * AmigaOS support fixed.
226 * Revision 1.5 2001/05/22 18:46:04 oes
228 * - Enabled filtering banners by size rather than URL
229 * by adding patterns that replace all standard banner
230 * sizes with the "Junkbuster" gif to the re_filterfile
232 * - Enabled filtering WebBugs by providing a pattern
233 * which kills all 1x1 images
235 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
236 * which is selected by the (nonstandard and therefore
237 * capital) letter 'U' in the option string.
238 * It causes the quantifiers to be ungreedy by default.
239 * Appending a ? turns back to greedy (!).
241 * - Added a new interceptor ijb-send-banner, which
242 * sends back the "Junkbuster" gif. Without imagelist or
243 * MSIE detection support, or if tinygif = 1, or the
244 * URL isn't recognized as an imageurl, a lame HTML
245 * explanation is sent instead.
247 * - Added new feature, which permits blocking remote
248 * script redirects and firing back a local redirect
250 * The feature is conditionally compiled, i.e. it
251 * can be disabled with --disable-fast-redirects,
252 * plus it must be activated by a "fast-redirects"
253 * line in the config file, has its own log level
254 * and of course wants to be displayed by show-proxy-args
255 * Note: Boy, all the #ifdefs in 1001 locations and
256 * all the fumbling with configure.in and acconfig.h
257 * were *way* more work than the feature itself :-(
259 * - Because a generic redirect template was needed for
260 * this, tinygif = 3 now uses the same.
262 * - Moved GIFs, and other static HTTP response templates
267 * - Removed some >400 CRs again (Jon, you really worked
270 * Revision 1.4 2001/05/21 19:34:01 jongfoster
271 * Made failure to bind() a fatal error.
273 * Revision 1.3 2001/05/20 01:21:20 jongfoster
274 * Version 2.9.4 checkin.
275 * - Merged popupfile and cookiefile, and added control over PCRS
276 * filtering, in new "permissionsfile".
277 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
278 * file error you now get a message box (in the Win32 GUI) rather
279 * than the program exiting with no explanation.
280 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
282 * - Removed tabs from "config"
283 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
284 * - Bumped up version number.
286 * Revision 1.2 2001/05/17 22:34:44 oes
287 * - Added hint on GIF char array generation to jcc.c
288 * - Cleaned CRLF's from the sources and related files
289 * - Repaired logging for REF and FRC
291 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
292 * Initial import of version 2.9.3 source tree
295 *********************************************************************/
301 #include <sys/types.h>
308 #ifdef FEATURE_PTHREAD
310 #endif /* def FEATURE_PTHREAD */
313 # ifndef FEATURE_PTHREAD
314 # include <windows.h>
315 # include <process.h>
316 # endif /* ndef FEATURE_PTHREAD */
319 # ifndef _WIN_CONSOLE
321 # endif /* ndef _WIN_CONSOLE */
323 #else /* ifndef _WIN32 */
326 # include <sys/time.h>
327 # include <sys/wait.h>
328 # include <sys/stat.h>
332 # include <socket.h> /* BeOS has select() for sockets only. */
333 # include <OS.h> /* declarations for threads and stuff. */
337 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
352 #include "killpopup.h"
353 #include "miscutil.h"
355 #include "jbsockets.h"
361 const char jcc_h_rcs[] = JCC_H_VERSION;
362 const char project_h_rcs[] = PROJECT_H_VERSION;
364 struct client_state clients[1];
365 struct file_list files[1];
367 #ifdef FEATURE_STATISTICS
368 int urls_read = 0; /* total nr of urls read inc rejected */
369 int urls_rejected = 0; /* total nr of urls rejected */
370 #endif /* def FEATURE_STATISTICS */
373 static void listen_loop(void);
374 static void chat(struct client_state *csp);
376 void serve(struct client_state *csp);
377 #else /* ifndef AMIGA */
378 static void serve(struct client_state *csp);
379 #endif /* def AMIGA */
382 static int32 server_thread(void *data);
383 #endif /* def __BEOS__ */
386 #define sleep(N) Sleep(((N) * 1000))
390 /* The vanilla wafer. */
391 static const char VANILLA_WAFER[] =
392 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
393 "Do_not_send_me_any_copyrighted_information_other_than_the_"
394 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
395 "In_particular_do_not_send_me_any_cookies_that_"
396 "are_subject_to_a_claim_of_copyright_by_anybody._"
397 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
398 "(copyright_or_otherwise)_applying_to_any_cookie._";
401 /*********************************************************************
405 * Description : Once a connection to the client has been accepted,
406 * this function is called (via serve()) to handle the
407 * main business of the communication. When this
408 * function returns, the caller must close the client
412 * 1 : csp = Current client state (buffers, headers, etc...)
414 * Returns : On success, the number of bytes written are returned (zero
415 * indicates nothing was written). On error, -1 is returned,
416 * and errno is set appropriately. If count is zero and the
417 * file descriptor refers to a regular file, 0 will be
418 * returned without causing any other effect. For a special
419 * file, the results are not portable.
421 *********************************************************************/
422 static void chat(struct client_state *csp)
425 * This next lines are a little ugly, but they simplifies the if statements
426 * below. Basically if TOGGLE, then we want the if to test "csp->toggled_on",
427 * else we don't. And if FEATURE_FORCE_LOAD, then we want the if to test
428 * "csp->toggled_on", else we don't
430 #ifdef FEATURE_TOGGLE
431 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
432 #else /* ifndef FEATURE_TOGGLE */
433 # define IS_TOGGLED_ON_AND
434 #endif /* ndef FEATURE_TOGGLE */
435 #ifdef FEATURE_FORCE_LOAD
436 # define IS_NOT_FORCED_AND (!csp->force) &&
437 #else /* ifndef FEATURE_FORCE_LOAD */
438 # define IS_NOT_FORCED_AND
439 #endif /* def FEATURE_FORCE_LOAD */
441 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
443 char buf[BUFFER_SIZE];
446 int n, maxfd, server_body;
447 int ms_iis5_hack = 0;
449 const struct forward_spec * fwd;
450 struct http_request *http;
451 #ifdef FEATURE_KILL_POPUPS
452 int block_popups; /* bool, 1==will block popups */
453 int block_popups_now = 0; /* bool, 1==currently blocking popups */
454 #endif /* def FEATURE_KILL_POPUPS */
456 int pcrs_filter; /* bool, 1==will filter through pcrs */
457 int gif_deanimate; /* bool, 1==will deanimate gifs */
459 /* Function that does the content filtering for the current request */
460 char *(*content_filter)() = NULL;
462 /* Skeleton for HTTP response, if we should intercept the request */
463 struct http_response *rsp;
468 * Read the client's request. Note that since we're not using select() we
469 * could get blocked here if a client connected, then didn't say anything!
474 n = read_socket(csp->cfd, buf, sizeof(buf));
476 if (n <= 0) break; /* error! */
478 add_to_iob(csp, buf, n);
480 req = get_header(csp);
484 break; /* no HTTP request! */
489 continue; /* more to come! */
492 #ifdef FEATURE_FORCE_LOAD
493 /* If this request contains the FORCE_PREFIX,
494 * better get rid of it now and set the force flag --oes
497 if (strstr(req, FORCE_PREFIX))
499 strclean(req, FORCE_PREFIX);
500 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
507 #endif /* def FEATURE_FORCE_LOAD */
509 parse_http_request(req, http, csp);
514 if (http->cmd == NULL)
516 strcpy(buf, CHEADER);
517 write_socket(csp->cfd, buf, strlen(buf));
519 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
524 /* decide how to route the HTTP request */
526 if ((fwd = forward_url(http, csp)) == NULL)
528 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
529 /* Never get here - LOG_LEVEL_FATAL causes program exit */
532 /* build the http request to send to the server
533 * we have to do one of the following:
535 * create = use the original HTTP request to create a new
536 * HTTP request that has only the path component
537 * without the http://domainspec
538 * pass = pass the original HTTP request unchanged
540 * drop = drop the HTTP request
545 * +--------+--------+
547 * 0 | create | drop |
549 * Forwarding +--------+--------+
553 * +--------+--------+
557 if (fwd->forward_host)
559 /* if forwarding, just pass the request as is */
560 enlist(csp->headers, http->cmd);
566 /* otherwise elide the host information from the url */
568 p = strsav(p, http->gpc);
570 p = strsav(p, http->path);
572 p = strsav(p, http->ver);
573 enlist(csp->headers, p);
578 /* decide what we're to do with cookies */
580 #ifdef FEATURE_TOGGLE
581 if (!csp->toggled_on)
583 /* Most compatible set of actions (i.e. none) */
584 init_current_action(csp->action);
587 #endif /* ndef FEATURE_TOGGLE */
589 url_actions(http, csp);
592 #ifdef FEATURE_COOKIE_JAR
594 * If we're logging cookies in a cookie jar, and the user has not
595 * supplied any wafers, and the user has not told us to suppress the
596 * vanilla wafer, then send the vanilla wafer.
598 if ((csp->config->jarfile != NULL)
599 && list_is_empty(csp->action->multi[ACTION_MULTI_WAFER])
600 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
602 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
604 #endif /* def FEATURE_COOKIE_JAR */
606 #ifdef FEATURE_KILL_POPUPS
607 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
608 #endif /* def FEATURE_KILL_POPUPS */
610 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
611 ((csp->action->flags & ACTION_FILTER) != 0);
613 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
615 /* grab the rest of the client's headers */
619 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
621 n = read_socket(csp->cfd, buf, sizeof(buf));
624 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
627 add_to_iob(csp, buf, n);
631 if (p == NULL) break;
633 enlist(csp->headers, p);
637 /* We have a request. */
639 hdr = sed(client_patterns, add_client_headers, csp);
640 list_remove_all(csp->headers);
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);
692 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
694 if (fwd->forward_host)
696 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
697 fwd->forward_host, fwd->forward_port, http->hostport);
701 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
704 /* here we connect to the server, gateway, or the forwarder */
706 csp->sfd = forwarded_connect(fwd, http, csp);
710 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
715 rsp = error_response(csp, "no-such-domain", errno);
717 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
718 csp->ip_addr_str, http->cmd);
722 rsp = error_response(csp, "connect-failed", errno);
724 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
725 csp->ip_addr_str, http->cmd);
728 /* Write the answer to the client */
731 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
732 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
734 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
738 free_http_response(rsp);
743 log_error(LOG_LEVEL_CONNECT, "OK");
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);