1 const char jcc_rcs[] = "$Id: jcc.c,v 1.33 2001/07/29 19:32:00 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 1.33 2001/07/29 19:32:00 jongfoster
37 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
39 * Revision 1.32 2001/07/29 18:47:05 jongfoster
40 * Adding missing #include "loadcfg.h"
42 * Revision 1.31 2001/07/29 12:17:48 oes
43 * Applied pthread fix by Paul Lieverse
45 * Revision 1.30 2001/07/25 22:57:13 jongfoster
46 * __BEOS__ no longer overrides FEATURE_PTHREAD.
47 * This is because FEATURE_PTHREAD will soon be widely used, so I
48 * want to keep it simple.
50 * Revision 1.29 2001/07/24 12:47:06 oes
51 * Applied BeOS support update by Eugenia
53 * Revision 1.28 2001/07/23 13:26:12 oes
54 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
56 * Revision 1.27 2001/07/19 19:09:47 haroon
57 * - Added code to take care of the situation where while processing the first
58 * server response (which includes the server header), after finding the end
59 * of the headers we were not looking past the end of the headers for
60 * content modification. I enabled it for filter_popups.
61 * Someone else should look to see if other similar operations should be
62 * done to the discarded portion of the buffer.
64 * Note 2001/07/20: No, the other content modification mechanisms will process
65 * the whole iob later anyway. --oes
67 * Revision 1.26 2001/07/18 12:31:36 oes
70 * Revision 1.25 2001/07/15 19:43:49 jongfoster
71 * Supports POSIX threads.
72 * Also removed some unused #includes.
74 * Revision 1.24 2001/07/13 14:00:40 oes
75 * - Generic content modification scheme:
76 * Each feature has its own applicability flag that is set
77 * from csp->action->flags.
78 * Replaced the "filtering" int flag , by a function pointer
79 * "content_filter" to the function that will do the content
80 * modification. If it is != NULL, the document will be buffered
81 * and processed through *content_filter, which must set
82 * csp->content_length and return a modified copy of the body
83 * or return NULL (on failiure).
84 * - Changed csp->is_text to the more generic bitmap csp->content_type
85 * which can currently take the valued CT_TEXT or CT_GIF
87 * - Removed all #ifdef PCRS
89 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
90 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
91 * the `block_acl' call. This prevents a compilation error when the user
92 * does not wish to use the "ACL" feature.
94 * Revision 1.22 2001/06/29 21:45:41 oes
95 * Indentation, CRLF->LF, Tab-> Space
97 * Revision 1.21 2001/06/29 13:29:36 oes
98 * - Cleaned up, improved comments
99 * - Unified all possible interceptors (CGI,
100 * block, trust, fast_redirect) in one
101 * place, with one (CGI) answer generation
102 * mechansim. Much clearer now.
103 * - Removed the GIF image generation, which
104 * is now done in filters.c:block_url()
105 * - Made error conditions like domain lookup
106 * failiure or (various) problems while talking
107 * to the server use cgi.c:error_response()
108 * instead of generating HTML/HTTP in chat() (yuck!)
109 * - Removed logentry from cancelled commit
111 * Revision 1.20 2001/06/09 10:55:28 jongfoster
112 * Changing BUFSIZ ==> BUFFER_SIZE
114 * Revision 1.19 2001/06/07 23:12:52 jongfoster
115 * Replacing function pointer in struct gateway with a directly
116 * called function forwarded_connect().
117 * Replacing struct gateway with struct forward_spec
119 * Revision 1.18 2001/06/03 19:12:16 oes
120 * introduced new cgi handling
122 * Revision 1.17 2001/06/01 20:07:23 jongfoster
123 * Now uses action +image-blocker{} rather than config->tinygif
125 * Revision 1.16 2001/06/01 18:49:17 jongfoster
126 * Replaced "list_share" with "list" - the tiny memory gain was not
127 * worth the extra complexity.
129 * Revision 1.15 2001/05/31 21:24:47 jongfoster
130 * Changed "permission" to "action" throughout.
131 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
132 * Moved vanilla wafer check into chat(), since we must now
133 * decide whether or not to add it based on the URL.
135 * Revision 1.14 2001/05/29 20:14:01 joergs
136 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
139 * Revision 1.13 2001/05/29 09:50:24 jongfoster
140 * Unified blocklist/imagelist/permissionslist.
141 * File format is still under discussion, but the internal changes
144 * Also modified interceptor behaviour:
145 * - We now intercept all URLs beginning with one of the following
146 * prefixes (and *only* these prefixes):
148 * * http://ijbswa.sf.net/config/
149 * * http://ijbswa.sourceforge.net/config/
150 * - New interceptors "home page" - go to http://i.j.b/ to see it.
151 * - Internal changes so that intercepted and fast redirect pages
152 * are not replaced with an image.
153 * - Interceptors now have the option to send a binary page direct
154 * to the client. (i.e. ijb-send-banner uses this)
155 * - Implemented show-url-info interceptor. (Which is why I needed
156 * the above interceptors changes - a typical URL is
157 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
158 * The previous mechanism would not have intercepted that, and
159 * if it had been intercepted then it then it would have replaced
162 * Revision 1.12 2001/05/27 22:17:04 oes
164 * - re_process_buffer no longer writes the modified buffer
165 * to the client, which was very ugly. It now returns the
166 * buffer, which it is then written by chat.
168 * - content_length now adjusts the Content-Length: header
169 * for modified documents rather than crunch()ing it.
170 * (Length info in csp->content_length, which is 0 for
171 * unmodified documents)
173 * - For this to work, sed() is called twice when filtering.
175 * Revision 1.11 2001/05/26 17:27:53 jongfoster
176 * Added support for CLF and fixed LOG_LEVEL_LOG.
177 * Also did CRLF->LF fix of my previous patch.
179 * Revision 1.10 2001/05/26 15:26:15 jongfoster
180 * ACL feature now provides more security by immediately dropping
181 * connections from untrusted hosts.
183 * Revision 1.9 2001/05/26 00:28:36 jongfoster
184 * Automatic reloading of config file.
185 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
186 * Most of the global variables have been moved to a new
187 * struct configuration_spec, accessed through csp->config->globalname
188 * Most of the globals remaining are used by the Win32 GUI.
190 * Revision 1.8 2001/05/25 22:43:18 jongfoster
191 * Fixing minor memory leak and buffer overflow.
193 * Revision 1.7 2001/05/25 22:34:30 jongfoster
196 * Revision 1.6 2001/05/23 00:13:58 joergs
197 * AmigaOS support fixed.
199 * Revision 1.5 2001/05/22 18:46:04 oes
201 * - Enabled filtering banners by size rather than URL
202 * by adding patterns that replace all standard banner
203 * sizes with the "Junkbuster" gif to the re_filterfile
205 * - Enabled filtering WebBugs by providing a pattern
206 * which kills all 1x1 images
208 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
209 * which is selected by the (nonstandard and therefore
210 * capital) letter 'U' in the option string.
211 * It causes the quantifiers to be ungreedy by default.
212 * Appending a ? turns back to greedy (!).
214 * - Added a new interceptor ijb-send-banner, which
215 * sends back the "Junkbuster" gif. Without imagelist or
216 * MSIE detection support, or if tinygif = 1, or the
217 * URL isn't recognized as an imageurl, a lame HTML
218 * explanation is sent instead.
220 * - Added new feature, which permits blocking remote
221 * script redirects and firing back a local redirect
223 * The feature is conditionally compiled, i.e. it
224 * can be disabled with --disable-fast-redirects,
225 * plus it must be activated by a "fast-redirects"
226 * line in the config file, has its own log level
227 * and of course wants to be displayed by show-proxy-args
228 * Note: Boy, all the #ifdefs in 1001 locations and
229 * all the fumbling with configure.in and acconfig.h
230 * were *way* more work than the feature itself :-(
232 * - Because a generic redirect template was needed for
233 * this, tinygif = 3 now uses the same.
235 * - Moved GIFs, and other static HTTP response templates
240 * - Removed some >400 CRs again (Jon, you really worked
243 * Revision 1.4 2001/05/21 19:34:01 jongfoster
244 * Made failure to bind() a fatal error.
246 * Revision 1.3 2001/05/20 01:21:20 jongfoster
247 * Version 2.9.4 checkin.
248 * - Merged popupfile and cookiefile, and added control over PCRS
249 * filtering, in new "permissionsfile".
250 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
251 * file error you now get a message box (in the Win32 GUI) rather
252 * than the program exiting with no explanation.
253 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
255 * - Removed tabs from "config"
256 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
257 * - Bumped up version number.
259 * Revision 1.2 2001/05/17 22:34:44 oes
260 * - Added hint on GIF char array generation to jcc.c
261 * - Cleaned CRLF's from the sources and related files
262 * - Repaired logging for REF and FRC
264 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
265 * Initial import of version 2.9.3 source tree
268 *********************************************************************/
274 #include <sys/types.h>
281 #ifdef FEATURE_PTHREAD
283 #endif /* def FEATURE_PTHREAD */
286 # ifndef FEATURE_PTHREAD
287 # include <windows.h>
288 # include <process.h>
289 # endif /* ndef FEATURE_PTHREAD */
292 # ifndef _WIN_CONSOLE
294 # endif /* ndef _WIN_CONSOLE */
296 #else /* ifndef _WIN32 */
299 # include <sys/time.h>
300 # include <sys/wait.h>
301 # include <sys/stat.h>
305 # include <socket.h> /* BeOS has select() for sockets only. */
306 # include <OS.h> /* declarations for threads and stuff. */
320 #include "showargs.h"
322 #include "killpopup.h"
323 #include "miscutil.h"
325 #include "jbsockets.h"
331 const char jcc_h_rcs[] = JCC_H_VERSION;
332 const char project_h_rcs[] = PROJECT_H_VERSION;
334 struct client_state clients[1];
335 struct file_list files[1];
337 #ifdef FEATURE_STATISTICS
338 int urls_read = 0; /* total nr of urls read inc rejected */
339 int urls_rejected = 0; /* total nr of urls rejected */
340 #endif /* def FEATURE_STATISTICS */
343 static void listen_loop(void);
344 static void chat(struct client_state *csp);
346 void serve(struct client_state *csp);
347 #else /* ifndef AMIGA */
348 static void serve(struct client_state *csp);
349 #endif /* def AMIGA */
352 static int32 server_thread(void *data);
353 #endif /* def __BEOS__ */
356 #define sleep(N) Sleep(((N) * 1000))
360 /* The vanilla wafer. */
361 static const char VANILLA_WAFER[] =
362 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
363 "Do_not_send_me_any_copyrighted_information_other_than_the_"
364 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
365 "In_particular_do_not_send_me_any_cookies_that_"
366 "are_subject_to_a_claim_of_copyright_by_anybody._"
367 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
368 "(copyright_or_otherwise)_applying_to_any_cookie._";
371 /*********************************************************************
375 * Description : Once a connection to the client has been accepted,
376 * this function is called (via serve()) to handle the
377 * main business of the communication. When this
378 * function returns, the caller must close the client
382 * 1 : csp = Current client state (buffers, headers, etc...)
384 * Returns : On success, the number of bytes written are returned (zero
385 * indicates nothing was written). On error, -1 is returned,
386 * and errno is set appropriately. If count is zero and the
387 * file descriptor refers to a regular file, 0 will be
388 * returned without causing any other effect. For a special
389 * file, the results are not portable.
391 *********************************************************************/
392 static void chat(struct client_state *csp)
395 * This next lines are a little ugly, but they simplifies the if statements
396 * below. Basically if TOGGLE, then we want the if to test "csp->toggled_on",
397 * else we don't. And if FEATURE_FORCE_LOAD, then we want the if to test
398 * "csp->toggled_on", else we don't
400 #ifdef FEATURE_TOGGLE
401 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
402 #else /* ifndef FEATURE_TOGGLE */
403 # define IS_TOGGLED_ON_AND
404 #endif /* ndef FEATURE_TOGGLE */
405 #ifdef FEATURE_FORCE_LOAD
406 # define IS_NOT_FORCED_AND (!csp->force) &&
407 #else /* ifndef FEATURE_FORCE_LOAD */
408 # define IS_NOT_FORCED_AND
409 #endif /* def FEATURE_FORCE_LOAD */
411 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
413 char buf[BUFFER_SIZE];
417 int n, maxfd, server_body;
418 int ms_iis5_hack = 0;
420 const struct forward_spec * fwd;
421 struct http_request *http;
422 #ifdef FEATURE_KILL_POPUPS
423 int block_popups; /* bool, 1==will block popups */
424 int block_popups_now = 0; /* bool, 1==currently blocking popups */
425 #endif /* def FEATURE_KILL_POPUPS */
427 int pcrs_filter; /* bool, 1==will filter through pcrs */
428 int gif_deanimate; /* bool, 1==will deanimate gifs */
430 /* Function that does the content filtering for the current request */
431 char *(*content_filter)() = NULL;
433 /* Skeleton for HTTP response, if we should intercept the request */
434 struct http_response *rsp;
439 * Read the client's request. Note that since we're not using select() we
440 * could get blocked here if a client connected, then didn't say anything!
445 n = read_socket(csp->cfd, buf, sizeof(buf));
447 if (n <= 0) break; /* error! */
449 add_to_iob(csp, buf, n);
451 req = get_header(csp);
455 break; /* no HTTP request! */
460 continue; /* more to come! */
463 #ifdef FEATURE_FORCE_LOAD
464 /* If this request contains the FORCE_PREFIX,
465 * better get rid of it now and set the force flag --oes
468 if (strstr(req, FORCE_PREFIX))
470 strclean(req, FORCE_PREFIX);
471 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
478 #endif /* def FEATURE_FORCE_LOAD */
480 parse_http_request(req, http, csp);
485 if (http->cmd == NULL)
487 strcpy(buf, CHEADER);
488 write_socket(csp->cfd, buf, strlen(buf));
490 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
495 /* decide how to route the HTTP request */
497 if ((fwd = forward_url(http, csp)) == NULL)
499 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
500 /* Never get here - LOG_LEVEL_FATAL causes program exit */
503 /* build the http request to send to the server
504 * we have to do one of the following:
506 * create = use the original HTTP request to create a new
507 * HTTP request that has only the path component
508 * without the http://domainspec
509 * pass = pass the original HTTP request unchanged
511 * drop = drop the HTTP request
516 * +--------+--------+
518 * 0 | create | drop |
520 * Forwarding +--------+--------+
524 * +--------+--------+
528 if (fwd->forward_host)
530 /* if forwarding, just pass the request as is */
531 enlist(csp->headers, http->cmd);
537 /* otherwise elide the host information from the url */
539 p = strsav(p, http->gpc);
541 p = strsav(p, http->path);
543 p = strsav(p, http->ver);
544 enlist(csp->headers, p);
549 /* decide what we're to do with cookies */
551 #ifdef FEATURE_TOGGLE
552 if (!csp->toggled_on)
554 /* Most compatible set of actions (i.e. none) */
555 init_current_action(csp->action);
558 #endif /* ndef FEATURE_TOGGLE */
560 url_actions(http, csp);
563 #ifdef FEATURE_COOKIE_JAR
565 * If we're logging cookies in a cookie jar, and the user has not
566 * supplied any wafers, and the user has not told us to suppress the
567 * vanilla wafer, then send the vanilla wafer.
569 if ((csp->config->jarfile != NULL)
570 && (csp->action->multi[ACTION_MULTI_WAFER]->next == NULL)
571 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
573 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
575 #endif /* def FEATURE_COOKIE_JAR */
577 #ifdef FEATURE_KILL_POPUPS
578 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
579 #endif /* def FEATURE_KILL_POPUPS */
581 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
582 ((csp->action->flags & ACTION_FILTER) != 0);
584 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
586 /* grab the rest of the client's headers */
590 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
592 n = read_socket(csp->cfd, buf, sizeof(buf));
595 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
598 add_to_iob(csp, buf, n);
602 if (p == NULL) break;
604 enlist(csp->headers, p);
608 /* We have a request. */
610 hdr = sed(client_patterns, add_client_headers, csp);
611 destroy_list(csp->headers);
614 * Now, check to see if we need to intercept it, i.e.
619 /* a CGI call was detected and answered */
620 (NULL != (rsp = dispatch_cgi(csp)))
622 /* or we are enabled and... */
625 /* ..the request was blocked */
626 ( NULL != (rsp = block_url(csp)))
630 || ( NULL != (rsp = trust_url(csp)))
631 #endif /* def FEATURE_TRUST */
633 /* ..or a fast redirect kicked in */
634 #ifdef FEATURE_FAST_REDIRECTS
635 || (((csp->action->flags & ACTION_FAST_REDIRECTS) != 0) &&
636 (NULL != (rsp = redirect_url(csp))))
637 #endif /* def FEATURE_FAST_REDIRECTS */
641 /* Write the answer to the client */
642 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
643 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
645 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
648 #ifdef FEATURE_STATISTICS
649 /* Count as a rejected request */
651 #endif /* def FEATURE_STATISTICS */
653 /* Log (FIXME: All intercept reasons apprear as "crunch" with Status 200) */
654 log_error(LOG_LEVEL_GPC, "%s%s crunch!", http->hostport, http->path);
655 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 3", csp->ip_addr_str, http->cmd);
657 /* Clean up and return */
658 free_http_response(rsp);
663 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
665 if (fwd->forward_host)
667 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
668 fwd->forward_host, fwd->forward_port, http->hostport);
672 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
675 /* here we connect to the server, gateway, or the forwarder */
677 csp->sfd = forwarded_connect(fwd, http, csp);
681 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
686 rsp = error_response(csp, "no-such-domain", errno);
688 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
689 csp->ip_addr_str, http->cmd);
693 rsp = error_response(csp, "connect-failed", errno);
695 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
696 csp->ip_addr_str, http->cmd);
699 /* Write the answer to the client */
702 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
703 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
705 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
709 free_http_response(rsp);
714 log_error(LOG_LEVEL_CONNECT, "OK");
716 if (fwd->forward_host || (http->ssl == 0))
718 /* write the client's (modified) header to the server
719 * (along with anything else that may be in the buffer)
724 if ((write_socket(csp->sfd, hdr, n) != n)
725 || (flush_socket(csp->sfd, csp ) < 0))
727 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
730 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
731 csp->ip_addr_str, http->cmd);
733 rsp = error_response(csp, "connect-failed", errno);
737 if ((write_socket(csp->cfd, rsp->head, n) != n)
738 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
740 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
744 free_http_response(rsp);
752 * We're running an SSL tunnel and we're not forwarding,
753 * so just send the "connect succeeded" message to the
754 * client, flush the rest, and get out of the way.
756 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 2\n",
757 csp->ip_addr_str, http->cmd);
759 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0)
767 /* we're finished with the client's header */
770 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
772 /* pass data between the client and server
773 * until one or the other shuts down the connection.
782 FD_SET(csp->cfd, &rfds);
783 FD_SET(csp->sfd, &rfds);
785 n = select(maxfd+1, &rfds, NULL, NULL, NULL);
789 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
793 /* this is the body of the browser's request
794 * just read it and write it.
797 if (FD_ISSET(csp->cfd, &rfds))
799 n = read_socket(csp->cfd, buf, sizeof(buf));
803 break; /* "game over, man" */
806 if (write_socket(csp->sfd, buf, n) != n)
808 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
815 * The server wants to talk. It could be the header or the body.
816 * If `hdr' is null, then it's the header otherwise it's the body.
817 * FIXME: Does `hdr' really mean `host'? No.
821 if (FD_ISSET(csp->sfd, &rfds))
824 n = read_socket(csp->sfd, buf, sizeof(buf) - 1);
828 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
830 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
831 csp->ip_addr_str, http->cmd);
833 rsp = error_response(csp, "connect-failed", errno);
837 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
838 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
840 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
844 free_http_response(rsp);
848 /* Add a trailing zero. This lets filter_popups
849 * use string operations.
853 #ifdef FEATURE_KILL_POPUPS
854 /* Filter the popups on this read. */
855 if (block_popups_now)
857 filter_popups(buf, n);
859 #endif /* def FEATURE_KILL_POPUPS */
861 /* Normally, this would indicate that we've read
862 * as much as the server has sent us and we can
863 * close the client connection. However, Microsoft
864 * in its wisdom has released IIS/5 with a bug that
865 * prevents it from sending the trailing \r\n in
866 * a 302 redirect header (and possibly other headers).
867 * To work around this if we've haven't parsed
868 * a full header we'll append a trailing \r\n
869 * and see if this now generates a valid one.
871 * This hack shouldn't have any impacts. If we've
872 * already transmitted the header or if this is a
873 * SSL connection, then we won't bother with this
874 * hack. So we only work on partially received
875 * headers. If we append a \r\n and this still
876 * doesn't generate a valid header, then we won't
877 * transmit anything to the client.
882 if (server_body || http->ssl)
885 * If we have been buffering up the document,
886 * now is the time to apply content modification
887 * and send the result to the client.
892 * If the content filter fails, use the original
894 * (see p != NULL ? p : csp->iob->cur below)
896 if (NULL == (p = (*content_filter)(csp)))
898 csp->content_length = csp->iob->eod - csp->iob->cur;
901 hdr = sed(server_patterns, add_server_headers, csp);
904 if ((write_socket(csp->cfd, hdr, n) != n)
905 || (write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length) != csp->content_length))
907 log_error(LOG_LEVEL_CONNECT, "write modified content to client failed: %E");
915 break; /* "game over, man" */
919 * This is NOT the body, so
920 * Let's pretend the server just sent us a blank line.
922 n = sprintf(buf, "\r\n");
925 * Now, let the normal header parsing algorithm below do its
926 * job. If it fails, we'll exit instead of continuing.
933 * If this is an SSL connection or we're in the body
934 * of the server document, just write it to the client,
935 * unless we need to buffer the body for later content-filtering
938 if (server_body || http->ssl)
942 add_to_iob(csp, buf, n);
946 if (write_socket(csp->cfd, buf, n) != n)
948 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
957 /* we're still looking for the end of the
958 * server's header ... (does that make header
959 * parsing an "out of body experience" ?
962 /* buffer up the data we just read */
963 add_to_iob(csp, buf, n);
965 /* get header lines from the iob */
967 while ((p = get_header(csp)))
971 /* see following note */
974 enlist(csp->headers, p);
978 /* NOTE: there are no "empty" headers so
979 * if the pointer `p' is not NULL we must
980 * assume that we reached the end of the
981 * buffer before we hit the end of the header.
988 /* Well, we tried our MS IIS/5
989 * hack and it didn't work.
990 * The header is incomplete
991 * and there isn't anything
992 * we can do about it.
998 /* Since we have to wait for
999 * more from the server before
1000 * we can parse the headers
1001 * we just continue here.
1007 /* we have now received the entire header.
1008 * filter it and send the result to the client
1011 hdr = sed(server_patterns, add_server_headers, csp);
1014 /* write the server's (modified) header to
1015 * the client (along with anything else that
1016 * may be in the buffer)
1019 #ifdef FEATURE_KILL_POPUPS
1020 /* Start blocking popups if appropriate. */
1022 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1023 !http->ssl && /* We talk plaintext */
1024 block_popups) /* Policy allows */
1026 block_popups_now = 1;
1028 * Filter the part of the body that came in the same read
1029 * as the last headers:
1031 filter_popups(csp->iob->cur, csp->iob->eod - csp->iob->cur);
1034 #endif /* def FEATURE_KILL_POPUPS */
1036 /* Buffer and pcrs filter this if appropriate. */
1038 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1039 !http->ssl && /* We talk plaintext */
1040 pcrs_filter) /* Policy allows */
1042 content_filter = pcrs_filter_response;
1045 /* Buffer and gif_deanimate this if appropriate. */
1047 if ((csp->content_type & CT_GIF) && /* It's a image/gif MIME-Type */
1048 !http->ssl && /* We talk plaintext */
1049 gif_deanimate) /* Policy allows */
1051 content_filter = gif_deanimate_response;
1056 * Only write if we're not buffering for content modification
1058 if (!content_filter && ((write_socket(csp->cfd, hdr, n) != n)
1059 || (n = flush_socket(csp->cfd, csp) < 0)))
1061 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
1063 /* the write failed, so don't bother
1064 * mentioning it to the client...
1065 * it probably can't hear us anyway.
1071 !content_filter && (byte_count += n);
1073 /* we're finished with the server's header */
1078 /* If this was a MS IIS/5 hack then it means
1079 * the server has already closed the
1080 * connection. Nothing more to read. Time
1091 return; /* huh? we should never get here */
1094 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
1095 csp->ip_addr_str, http->cmd, byte_count);
1099 /*********************************************************************
1103 * Description : This is little more than chat. We only "serve" to
1104 * to close any socket that chat may have opened.
1107 * 1 : csp = Current client state (buffers, headers, etc...)
1111 *********************************************************************/
1113 void serve(struct client_state *csp)
1114 #else /* ifndef AMIGA */
1115 static void serve(struct client_state *csp)
1116 #endif /* def AMIGA */
1119 close_socket(csp->cfd);
1123 close_socket(csp->sfd);
1132 /*********************************************************************
1134 * Function : server_thread
1136 * Description : We only exist to call `serve' in a threaded environment.
1139 * 1 : data = Current client state (buffers, headers, etc...)
1141 * Returns : Always 0.
1143 *********************************************************************/
1144 static int32 server_thread(void *data)
1146 serve((struct client_state *) data);
1153 /*********************************************************************
1157 * Description : Load the config file and start the listen loop.
1158 * This function is a lot more *sane* with the `load_config'
1159 * and `listen_loop' functions; although it stills does
1160 * a *little* too much for my taste.
1163 * 1 : argc = Number of parameters (including $0).
1164 * 2 : argv = Array of (char *)'s to the parameters.
1166 * Returns : 1 if : can't open config file, unrecognized directive,
1167 * stats requested in multi-thread mode, can't open the
1168 * log file, can't open the jar file, listen port is invalid,
1169 * any load fails, and can't bind port.
1171 * Else main never returns, the process must be signaled
1172 * to terminate execution. Or, on Windows, use the
1173 * "File", "Exit" menu option.
1175 *********************************************************************/
1177 int real_main(int argc, const char *argv[])
1179 int main(int argc, const char *argv[])
1184 "AmiTCP:db/junkbuster/config"
1185 #elif !defined(_WIN32)
1192 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1193 if ((argc >= 2) && (strcmp(argv[1], "--help")==0))
1195 printf("JunkBuster proxy version " VERSION ".\n\n"
1196 "Usage: %s [configfile]\n\n"
1197 "See " HOME_PAGE_URL " for details.\n"
1198 "This program is distributed under the GNU GPL, version 2 or later.\n",
1202 if ((argc >= 2) && (strcmp(argv[1], "--version")==0))
1204 printf(VERSION "\n");
1207 #endif /* !defined(_WIN32) || defined(_WIN_CONSOLE) */
1214 configfile = argv[1];
1221 #elif defined(_WIN32)
1227 signal(SIGPIPE, SIG_IGN);
1228 signal(SIGCHLD, SIG_IGN);
1230 #else /* ifdef _WIN32 */
1231 # ifdef _WIN_CONSOLE
1233 * We *are* in a windows console app.
1234 * Print a verbose messages about FAQ's and such
1236 printf(win32_blurb);
1237 # endif /* def _WIN_CONSOLE */
1238 #endif /* def _WIN32 */
1249 /*********************************************************************
1251 * Function : listen_loop
1253 * Description : bind the listen port and enter a "FOREVER" listening loop.
1259 *********************************************************************/
1260 static void listen_loop(void)
1262 struct client_state *csp = NULL;
1264 struct configuration_spec * config;
1266 config = load_config();
1268 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1269 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1271 bfd = bind_port(config->haddr, config->hport);
1275 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1276 "- There may be another junkbuster or some other "
1277 "proxy running on port %d",
1278 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1279 config->hport, config->hport
1281 /* shouldn't get here */
1285 config->need_bind = 0;
1290 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
1291 while (waitpid(-1, NULL, WNOHANG) > 0)
1293 /* zombie children */
1295 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
1298 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
1300 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
1304 memset(csp, '\0', sizeof(*csp));
1309 csp->config = config = load_config();
1311 if ( config->need_bind )
1314 * Since we were listening to the "old port", we will not see
1315 * a "listen" param change until the next IJB request. So, at
1316 * least 1 more request must be made for us to find the new
1317 * setting. I am simply closing the old socket and binding the
1320 * Which-ever is correct, we will serve 1 more page via the
1321 * old settings. This should probably be a "show-proxy-args"
1322 * request. This should not be a so common of an operation
1323 * that this will hurt people's feelings.
1328 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1329 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1330 bfd = bind_port(config->haddr, config->hport);
1334 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1335 "- There may be another junkbuster or some other "
1336 "proxy running on port %d",
1337 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1338 config->hport, config->hport
1340 /* shouldn't get here */
1344 config->need_bind = 0;
1347 log_error(LOG_LEVEL_CONNECT, "accept connection ... ");
1349 if (!accept_connection(csp, bfd))
1351 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
1364 log_error(LOG_LEVEL_CONNECT, "OK");
1367 #ifdef FEATURE_TOGGLE
1368 /* by haroon - most of credit to srt19170 */
1369 csp->toggled_on = g_bToggleIJB;
1370 #endif /* def FEATURE_TOGGLE */
1372 if (run_loader(csp))
1374 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
1375 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1379 if (block_acl(NULL,csp))
1381 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
1382 close_socket(csp->cfd);
1386 #endif /* def FEATURE_ACL */
1388 /* add it to the list of clients */
1389 csp->next = clients->next;
1390 clients->next = csp;
1392 if (config->multi_threaded)
1396 /* this is a switch () statment in the C preprocessor - ugh */
1397 #undef SELECTED_ONE_OPTION
1399 /* Use Pthreads in preference to native code */
1400 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
1401 #define SELECTED_ONE_OPTION
1403 pthread_t the_thread;
1404 pthread_attr_t attrs;
1406 pthread_attr_init(&attrs);
1407 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
1408 child_id = (pthread_create(&the_thread, &attrs,
1409 (void*)serve, csp) ? -1 : 0);
1410 pthread_attr_destroy(&attrs);
1414 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
1415 #define SELECTED_ONE_OPTION
1416 child_id = _beginthread(
1422 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
1423 #define SELECTED_ONE_OPTION
1425 thread_id tid = spawn_thread
1426 (server_thread, "server", B_NORMAL_PRIORITY, csp);
1428 if ((tid >= 0) && (resume_thread(tid) == B_OK))
1430 child_id = (int) tid;
1439 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
1440 #define SELECTED_ONE_OPTION
1441 csp->cfd = ReleaseSocket(csp->cfd, -1);
1442 if((child_id = (int)CreateNewProcTags(
1443 NP_Entry, (ULONG)server_thread,
1444 NP_Output, Output(),
1445 NP_CloseOutput, FALSE,
1446 NP_Name, (ULONG)"junkbuster child",
1447 NP_StackSize, 200*1024,
1451 ((struct Task *)child_id)->tc_UserData = csp;
1452 Signal((struct Task *)child_id, SIGF_SINGLE);
1457 #if !defined(SELECTED_ONE_OPTION)
1460 /* This block is only needed when using fork().
1461 * When using threads, the server thread was
1462 * created and run by the call to _beginthread().
1464 if (child_id == 0) /* child */
1470 else if (child_id > 0) /* parent */
1472 /* in a fork()'d environment, the parent's
1473 * copy of the client socket and the CSP
1477 #if !defined(_WIN32) && defined(__CYGWIN__)
1479 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
1480 close_socket(csp->cfd);
1485 #undef SELECTED_ONE_OPTION
1486 /* end of cpp switch () */
1488 if (child_id < 0) /* failed */
1490 char buf[BUFFER_SIZE];
1492 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
1494 sprintf(buf , "JunkBuster: can't fork: errno = %d", errno);
1496 write_socket(csp->cfd, buf, strlen(buf));
1497 close_socket(csp->cfd);