1 const char jcc_rcs[] = "$Id: jcc.c,v 1.37 2001/09/10 11:12:24 oes 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 1.37 2001/09/10 11:12:24 oes
37 * Deleted unused variable
39 * Revision 1.36 2001/09/10 10:56:15 oes
40 * Silenced compiler warnings
42 * Revision 1.35 2001/07/31 14:44:22 oes
43 * Deleted unused size parameter from filter_popups()
45 * Revision 1.34 2001/07/30 22:08:36 jongfoster
46 * Tidying up #defines:
47 * - All feature #defines are now of the form FEATURE_xxx
48 * - Permanently turned off WIN_GUI_EDIT
49 * - Permanently turned on WEBDAV and SPLIT_PROXY_ARGS
51 * Revision 1.33 2001/07/29 19:32:00 jongfoster
52 * Renaming _main() [mingw32 only] to real_main(), for ANSI compliance.
54 * Revision 1.32 2001/07/29 18:47:05 jongfoster
55 * Adding missing #include "loadcfg.h"
57 * Revision 1.31 2001/07/29 12:17:48 oes
58 * Applied pthread fix by Paul Lieverse
60 * Revision 1.30 2001/07/25 22:57:13 jongfoster
61 * __BEOS__ no longer overrides FEATURE_PTHREAD.
62 * This is because FEATURE_PTHREAD will soon be widely used, so I
63 * want to keep it simple.
65 * Revision 1.29 2001/07/24 12:47:06 oes
66 * Applied BeOS support update by Eugenia
68 * Revision 1.28 2001/07/23 13:26:12 oes
69 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
71 * Revision 1.27 2001/07/19 19:09:47 haroon
72 * - Added code to take care of the situation where while processing the first
73 * server response (which includes the server header), after finding the end
74 * of the headers we were not looking past the end of the headers for
75 * content modification. I enabled it for filter_popups.
76 * Someone else should look to see if other similar operations should be
77 * done to the discarded portion of the buffer.
79 * Note 2001/07/20: No, the other content modification mechanisms will process
80 * the whole iob later anyway. --oes
82 * Revision 1.26 2001/07/18 12:31:36 oes
85 * Revision 1.25 2001/07/15 19:43:49 jongfoster
86 * Supports POSIX threads.
87 * Also removed some unused #includes.
89 * Revision 1.24 2001/07/13 14:00:40 oes
90 * - Generic content modification scheme:
91 * Each feature has its own applicability flag that is set
92 * from csp->action->flags.
93 * Replaced the "filtering" int flag , by a function pointer
94 * "content_filter" to the function that will do the content
95 * modification. If it is != NULL, the document will be buffered
96 * and processed through *content_filter, which must set
97 * csp->content_length and return a modified copy of the body
98 * or return NULL (on failiure).
99 * - Changed csp->is_text to the more generic bitmap csp->content_type
100 * which can currently take the valued CT_TEXT or CT_GIF
102 * - Removed all #ifdef PCRS
104 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
105 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
106 * the `block_acl' call. This prevents a compilation error when the user
107 * does not wish to use the "ACL" feature.
109 * Revision 1.22 2001/06/29 21:45:41 oes
110 * Indentation, CRLF->LF, Tab-> Space
112 * Revision 1.21 2001/06/29 13:29:36 oes
113 * - Cleaned up, improved comments
114 * - Unified all possible interceptors (CGI,
115 * block, trust, fast_redirect) in one
116 * place, with one (CGI) answer generation
117 * mechansim. Much clearer now.
118 * - Removed the GIF image generation, which
119 * is now done in filters.c:block_url()
120 * - Made error conditions like domain lookup
121 * failiure or (various) problems while talking
122 * to the server use cgi.c:error_response()
123 * instead of generating HTML/HTTP in chat() (yuck!)
124 * - Removed logentry from cancelled commit
126 * Revision 1.20 2001/06/09 10:55:28 jongfoster
127 * Changing BUFSIZ ==> BUFFER_SIZE
129 * Revision 1.19 2001/06/07 23:12:52 jongfoster
130 * Replacing function pointer in struct gateway with a directly
131 * called function forwarded_connect().
132 * Replacing struct gateway with struct forward_spec
134 * Revision 1.18 2001/06/03 19:12:16 oes
135 * introduced new cgi handling
137 * Revision 1.17 2001/06/01 20:07:23 jongfoster
138 * Now uses action +image-blocker{} rather than config->tinygif
140 * Revision 1.16 2001/06/01 18:49:17 jongfoster
141 * Replaced "list_share" with "list" - the tiny memory gain was not
142 * worth the extra complexity.
144 * Revision 1.15 2001/05/31 21:24:47 jongfoster
145 * Changed "permission" to "action" throughout.
146 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
147 * Moved vanilla wafer check into chat(), since we must now
148 * decide whether or not to add it based on the URL.
150 * Revision 1.14 2001/05/29 20:14:01 joergs
151 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
154 * Revision 1.13 2001/05/29 09:50:24 jongfoster
155 * Unified blocklist/imagelist/permissionslist.
156 * File format is still under discussion, but the internal changes
159 * Also modified interceptor behaviour:
160 * - We now intercept all URLs beginning with one of the following
161 * prefixes (and *only* these prefixes):
163 * * http://ijbswa.sf.net/config/
164 * * http://ijbswa.sourceforge.net/config/
165 * - New interceptors "home page" - go to http://i.j.b/ to see it.
166 * - Internal changes so that intercepted and fast redirect pages
167 * are not replaced with an image.
168 * - Interceptors now have the option to send a binary page direct
169 * to the client. (i.e. ijb-send-banner uses this)
170 * - Implemented show-url-info interceptor. (Which is why I needed
171 * the above interceptors changes - a typical URL is
172 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
173 * The previous mechanism would not have intercepted that, and
174 * if it had been intercepted then it then it would have replaced
177 * Revision 1.12 2001/05/27 22:17:04 oes
179 * - re_process_buffer no longer writes the modified buffer
180 * to the client, which was very ugly. It now returns the
181 * buffer, which it is then written by chat.
183 * - content_length now adjusts the Content-Length: header
184 * for modified documents rather than crunch()ing it.
185 * (Length info in csp->content_length, which is 0 for
186 * unmodified documents)
188 * - For this to work, sed() is called twice when filtering.
190 * Revision 1.11 2001/05/26 17:27:53 jongfoster
191 * Added support for CLF and fixed LOG_LEVEL_LOG.
192 * Also did CRLF->LF fix of my previous patch.
194 * Revision 1.10 2001/05/26 15:26:15 jongfoster
195 * ACL feature now provides more security by immediately dropping
196 * connections from untrusted hosts.
198 * Revision 1.9 2001/05/26 00:28:36 jongfoster
199 * Automatic reloading of config file.
200 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
201 * Most of the global variables have been moved to a new
202 * struct configuration_spec, accessed through csp->config->globalname
203 * Most of the globals remaining are used by the Win32 GUI.
205 * Revision 1.8 2001/05/25 22:43:18 jongfoster
206 * Fixing minor memory leak and buffer overflow.
208 * Revision 1.7 2001/05/25 22:34:30 jongfoster
211 * Revision 1.6 2001/05/23 00:13:58 joergs
212 * AmigaOS support fixed.
214 * Revision 1.5 2001/05/22 18:46:04 oes
216 * - Enabled filtering banners by size rather than URL
217 * by adding patterns that replace all standard banner
218 * sizes with the "Junkbuster" gif to the re_filterfile
220 * - Enabled filtering WebBugs by providing a pattern
221 * which kills all 1x1 images
223 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
224 * which is selected by the (nonstandard and therefore
225 * capital) letter 'U' in the option string.
226 * It causes the quantifiers to be ungreedy by default.
227 * Appending a ? turns back to greedy (!).
229 * - Added a new interceptor ijb-send-banner, which
230 * sends back the "Junkbuster" gif. Without imagelist or
231 * MSIE detection support, or if tinygif = 1, or the
232 * URL isn't recognized as an imageurl, a lame HTML
233 * explanation is sent instead.
235 * - Added new feature, which permits blocking remote
236 * script redirects and firing back a local redirect
238 * The feature is conditionally compiled, i.e. it
239 * can be disabled with --disable-fast-redirects,
240 * plus it must be activated by a "fast-redirects"
241 * line in the config file, has its own log level
242 * and of course wants to be displayed by show-proxy-args
243 * Note: Boy, all the #ifdefs in 1001 locations and
244 * all the fumbling with configure.in and acconfig.h
245 * were *way* more work than the feature itself :-(
247 * - Because a generic redirect template was needed for
248 * this, tinygif = 3 now uses the same.
250 * - Moved GIFs, and other static HTTP response templates
255 * - Removed some >400 CRs again (Jon, you really worked
258 * Revision 1.4 2001/05/21 19:34:01 jongfoster
259 * Made failure to bind() a fatal error.
261 * Revision 1.3 2001/05/20 01:21:20 jongfoster
262 * Version 2.9.4 checkin.
263 * - Merged popupfile and cookiefile, and added control over PCRS
264 * filtering, in new "permissionsfile".
265 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
266 * file error you now get a message box (in the Win32 GUI) rather
267 * than the program exiting with no explanation.
268 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
270 * - Removed tabs from "config"
271 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
272 * - Bumped up version number.
274 * Revision 1.2 2001/05/17 22:34:44 oes
275 * - Added hint on GIF char array generation to jcc.c
276 * - Cleaned CRLF's from the sources and related files
277 * - Repaired logging for REF and FRC
279 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
280 * Initial import of version 2.9.3 source tree
283 *********************************************************************/
289 #include <sys/types.h>
296 #ifdef FEATURE_PTHREAD
298 #endif /* def FEATURE_PTHREAD */
301 # ifndef FEATURE_PTHREAD
302 # include <windows.h>
303 # include <process.h>
304 # endif /* ndef FEATURE_PTHREAD */
307 # ifndef _WIN_CONSOLE
309 # endif /* ndef _WIN_CONSOLE */
311 #else /* ifndef _WIN32 */
314 # include <sys/time.h>
315 # include <sys/wait.h>
316 # include <sys/stat.h>
320 # include <socket.h> /* BeOS has select() for sockets only. */
321 # include <OS.h> /* declarations for threads and stuff. */
335 #include "showargs.h"
337 #include "killpopup.h"
338 #include "miscutil.h"
340 #include "jbsockets.h"
346 const char jcc_h_rcs[] = JCC_H_VERSION;
347 const char project_h_rcs[] = PROJECT_H_VERSION;
349 struct client_state clients[1];
350 struct file_list files[1];
352 #ifdef FEATURE_STATISTICS
353 int urls_read = 0; /* total nr of urls read inc rejected */
354 int urls_rejected = 0; /* total nr of urls rejected */
355 #endif /* def FEATURE_STATISTICS */
358 static void listen_loop(void);
359 static void chat(struct client_state *csp);
361 void serve(struct client_state *csp);
362 #else /* ifndef AMIGA */
363 static void serve(struct client_state *csp);
364 #endif /* def AMIGA */
367 static int32 server_thread(void *data);
368 #endif /* def __BEOS__ */
371 #define sleep(N) Sleep(((N) * 1000))
375 /* The vanilla wafer. */
376 static const char VANILLA_WAFER[] =
377 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
378 "Do_not_send_me_any_copyrighted_information_other_than_the_"
379 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
380 "In_particular_do_not_send_me_any_cookies_that_"
381 "are_subject_to_a_claim_of_copyright_by_anybody._"
382 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
383 "(copyright_or_otherwise)_applying_to_any_cookie._";
386 /*********************************************************************
390 * Description : Once a connection to the client has been accepted,
391 * this function is called (via serve()) to handle the
392 * main business of the communication. When this
393 * function returns, the caller must close the client
397 * 1 : csp = Current client state (buffers, headers, etc...)
399 * Returns : On success, the number of bytes written are returned (zero
400 * indicates nothing was written). On error, -1 is returned,
401 * and errno is set appropriately. If count is zero and the
402 * file descriptor refers to a regular file, 0 will be
403 * returned without causing any other effect. For a special
404 * file, the results are not portable.
406 *********************************************************************/
407 static void chat(struct client_state *csp)
410 * This next lines are a little ugly, but they simplifies the if statements
411 * below. Basically if TOGGLE, then we want the if to test "csp->toggled_on",
412 * else we don't. And if FEATURE_FORCE_LOAD, then we want the if to test
413 * "csp->toggled_on", else we don't
415 #ifdef FEATURE_TOGGLE
416 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
417 #else /* ifndef FEATURE_TOGGLE */
418 # define IS_TOGGLED_ON_AND
419 #endif /* ndef FEATURE_TOGGLE */
420 #ifdef FEATURE_FORCE_LOAD
421 # define IS_NOT_FORCED_AND (!csp->force) &&
422 #else /* ifndef FEATURE_FORCE_LOAD */
423 # define IS_NOT_FORCED_AND
424 #endif /* def FEATURE_FORCE_LOAD */
426 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
428 char buf[BUFFER_SIZE];
431 int n, maxfd, server_body;
432 int ms_iis5_hack = 0;
434 const struct forward_spec * fwd;
435 struct http_request *http;
436 #ifdef FEATURE_KILL_POPUPS
437 int block_popups; /* bool, 1==will block popups */
438 int block_popups_now = 0; /* bool, 1==currently blocking popups */
439 #endif /* def FEATURE_KILL_POPUPS */
441 int pcrs_filter; /* bool, 1==will filter through pcrs */
442 int gif_deanimate; /* bool, 1==will deanimate gifs */
444 /* Function that does the content filtering for the current request */
445 char *(*content_filter)() = NULL;
447 /* Skeleton for HTTP response, if we should intercept the request */
448 struct http_response *rsp;
453 * Read the client's request. Note that since we're not using select() we
454 * could get blocked here if a client connected, then didn't say anything!
459 n = read_socket(csp->cfd, buf, sizeof(buf));
461 if (n <= 0) break; /* error! */
463 add_to_iob(csp, buf, n);
465 req = get_header(csp);
469 break; /* no HTTP request! */
474 continue; /* more to come! */
477 #ifdef FEATURE_FORCE_LOAD
478 /* If this request contains the FORCE_PREFIX,
479 * better get rid of it now and set the force flag --oes
482 if (strstr(req, FORCE_PREFIX))
484 strclean(req, FORCE_PREFIX);
485 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
492 #endif /* def FEATURE_FORCE_LOAD */
494 parse_http_request(req, http, csp);
499 if (http->cmd == NULL)
501 strcpy(buf, CHEADER);
502 write_socket(csp->cfd, buf, strlen(buf));
504 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
509 /* decide how to route the HTTP request */
511 if ((fwd = forward_url(http, csp)) == NULL)
513 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
514 /* Never get here - LOG_LEVEL_FATAL causes program exit */
517 /* build the http request to send to the server
518 * we have to do one of the following:
520 * create = use the original HTTP request to create a new
521 * HTTP request that has only the path component
522 * without the http://domainspec
523 * pass = pass the original HTTP request unchanged
525 * drop = drop the HTTP request
530 * +--------+--------+
532 * 0 | create | drop |
534 * Forwarding +--------+--------+
538 * +--------+--------+
542 if (fwd->forward_host)
544 /* if forwarding, just pass the request as is */
545 enlist(csp->headers, http->cmd);
551 /* otherwise elide the host information from the url */
553 p = strsav(p, http->gpc);
555 p = strsav(p, http->path);
557 p = strsav(p, http->ver);
558 enlist(csp->headers, p);
563 /* decide what we're to do with cookies */
565 #ifdef FEATURE_TOGGLE
566 if (!csp->toggled_on)
568 /* Most compatible set of actions (i.e. none) */
569 init_current_action(csp->action);
572 #endif /* ndef FEATURE_TOGGLE */
574 url_actions(http, csp);
577 #ifdef FEATURE_COOKIE_JAR
579 * If we're logging cookies in a cookie jar, and the user has not
580 * supplied any wafers, and the user has not told us to suppress the
581 * vanilla wafer, then send the vanilla wafer.
583 if ((csp->config->jarfile != NULL)
584 && (csp->action->multi[ACTION_MULTI_WAFER]->next == NULL)
585 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
587 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
589 #endif /* def FEATURE_COOKIE_JAR */
591 #ifdef FEATURE_KILL_POPUPS
592 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
593 #endif /* def FEATURE_KILL_POPUPS */
595 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
596 ((csp->action->flags & ACTION_FILTER) != 0);
598 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
600 /* grab the rest of the client's headers */
604 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
606 n = read_socket(csp->cfd, buf, sizeof(buf));
609 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
612 add_to_iob(csp, buf, n);
616 if (p == NULL) break;
618 enlist(csp->headers, p);
622 /* We have a request. */
624 hdr = sed(client_patterns, add_client_headers, csp);
625 destroy_list(csp->headers);
628 * Now, check to see if we need to intercept it, i.e.
633 /* a CGI call was detected and answered */
634 (NULL != (rsp = dispatch_cgi(csp)))
636 /* or we are enabled and... */
639 /* ..the request was blocked */
640 ( NULL != (rsp = block_url(csp)))
644 || ( NULL != (rsp = trust_url(csp)))
645 #endif /* def FEATURE_TRUST */
647 /* ..or a fast redirect kicked in */
648 #ifdef FEATURE_FAST_REDIRECTS
649 || (((csp->action->flags & ACTION_FAST_REDIRECTS) != 0) &&
650 (NULL != (rsp = redirect_url(csp))))
651 #endif /* def FEATURE_FAST_REDIRECTS */
655 /* Write the answer to the client */
656 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
657 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
659 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
662 #ifdef FEATURE_STATISTICS
663 /* Count as a rejected request */
665 #endif /* def FEATURE_STATISTICS */
667 /* Log (FIXME: All intercept reasons apprear as "crunch" with Status 200) */
668 log_error(LOG_LEVEL_GPC, "%s%s crunch!", http->hostport, http->path);
669 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 3", csp->ip_addr_str, http->cmd);
671 /* Clean up and return */
672 free_http_response(rsp);
677 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
679 if (fwd->forward_host)
681 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
682 fwd->forward_host, fwd->forward_port, http->hostport);
686 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
689 /* here we connect to the server, gateway, or the forwarder */
691 csp->sfd = forwarded_connect(fwd, http, csp);
695 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
700 rsp = error_response(csp, "no-such-domain", errno);
702 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
703 csp->ip_addr_str, http->cmd);
707 rsp = error_response(csp, "connect-failed", errno);
709 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
710 csp->ip_addr_str, http->cmd);
713 /* Write the answer to the client */
716 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
717 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
719 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
723 free_http_response(rsp);
728 log_error(LOG_LEVEL_CONNECT, "OK");
730 if (fwd->forward_host || (http->ssl == 0))
732 /* write the client's (modified) header to the server
733 * (along with anything else that may be in the buffer)
738 if ((write_socket(csp->sfd, hdr, n) != n)
739 || (flush_socket(csp->sfd, csp ) < 0))
741 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
744 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
745 csp->ip_addr_str, http->cmd);
747 rsp = error_response(csp, "connect-failed", errno);
751 if ((write_socket(csp->cfd, rsp->head, n) != n)
752 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
754 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
758 free_http_response(rsp);
766 * We're running an SSL tunnel and we're not forwarding,
767 * so just send the "connect succeeded" message to the
768 * client, flush the rest, and get out of the way.
770 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 2\n",
771 csp->ip_addr_str, http->cmd);
773 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0)
781 /* we're finished with the client's header */
784 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
786 /* pass data between the client and server
787 * until one or the other shuts down the connection.
796 FD_SET(csp->cfd, &rfds);
797 FD_SET(csp->sfd, &rfds);
799 n = select(maxfd+1, &rfds, NULL, NULL, NULL);
803 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
807 /* this is the body of the browser's request
808 * just read it and write it.
811 if (FD_ISSET(csp->cfd, &rfds))
813 n = read_socket(csp->cfd, buf, sizeof(buf));
817 break; /* "game over, man" */
820 if (write_socket(csp->sfd, buf, n) != n)
822 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
829 * The server wants to talk. It could be the header or the body.
830 * If `hdr' is null, then it's the header otherwise it's the body.
831 * FIXME: Does `hdr' really mean `host'? No.
835 if (FD_ISSET(csp->sfd, &rfds))
838 n = read_socket(csp->sfd, buf, sizeof(buf) - 1);
842 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
844 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
845 csp->ip_addr_str, http->cmd);
847 rsp = error_response(csp, "connect-failed", errno);
851 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
852 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
854 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
858 free_http_response(rsp);
862 /* Add a trailing zero. This lets filter_popups
863 * use string operations.
867 #ifdef FEATURE_KILL_POPUPS
868 /* Filter the popups on this read. */
869 if (block_popups_now)
873 #endif /* def FEATURE_KILL_POPUPS */
875 /* Normally, this would indicate that we've read
876 * as much as the server has sent us and we can
877 * close the client connection. However, Microsoft
878 * in its wisdom has released IIS/5 with a bug that
879 * prevents it from sending the trailing \r\n in
880 * a 302 redirect header (and possibly other headers).
881 * To work around this if we've haven't parsed
882 * a full header we'll append a trailing \r\n
883 * and see if this now generates a valid one.
885 * This hack shouldn't have any impacts. If we've
886 * already transmitted the header or if this is a
887 * SSL connection, then we won't bother with this
888 * hack. So we only work on partially received
889 * headers. If we append a \r\n and this still
890 * doesn't generate a valid header, then we won't
891 * transmit anything to the client.
896 if (server_body || http->ssl)
899 * If we have been buffering up the document,
900 * now is the time to apply content modification
901 * and send the result to the client.
906 * If the content filter fails, use the original
908 * (see p != NULL ? p : csp->iob->cur below)
910 if (NULL == (p = (*content_filter)(csp)))
912 csp->content_length = csp->iob->eod - csp->iob->cur;
915 hdr = sed(server_patterns, add_server_headers, csp);
918 if ((write_socket(csp->cfd, hdr, n) != n)
919 || (write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length) != csp->content_length))
921 log_error(LOG_LEVEL_CONNECT, "write modified content to client failed: %E");
929 break; /* "game over, man" */
933 * This is NOT the body, so
934 * Let's pretend the server just sent us a blank line.
936 n = sprintf(buf, "\r\n");
939 * Now, let the normal header parsing algorithm below do its
940 * job. If it fails, we'll exit instead of continuing.
947 * If this is an SSL connection or we're in the body
948 * of the server document, just write it to the client,
949 * unless we need to buffer the body for later content-filtering
952 if (server_body || http->ssl)
956 add_to_iob(csp, buf, n);
960 if (write_socket(csp->cfd, buf, n) != n)
962 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
971 /* we're still looking for the end of the
972 * server's header ... (does that make header
973 * parsing an "out of body experience" ?
976 /* buffer up the data we just read */
977 add_to_iob(csp, buf, n);
979 /* get header lines from the iob */
981 while ((p = get_header(csp)))
985 /* see following note */
988 enlist(csp->headers, p);
992 /* NOTE: there are no "empty" headers so
993 * if the pointer `p' is not NULL we must
994 * assume that we reached the end of the
995 * buffer before we hit the end of the header.
1002 /* Well, we tried our MS IIS/5
1003 * hack and it didn't work.
1004 * The header is incomplete
1005 * and there isn't anything
1006 * we can do about it.
1012 /* Since we have to wait for
1013 * more from the server before
1014 * we can parse the headers
1015 * we just continue here.
1021 /* we have now received the entire header.
1022 * filter it and send the result to the client
1025 hdr = sed(server_patterns, add_server_headers, csp);
1028 /* write the server's (modified) header to
1029 * the client (along with anything else that
1030 * may be in the buffer)
1033 #ifdef FEATURE_KILL_POPUPS
1034 /* Start blocking popups if appropriate. */
1036 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1037 !http->ssl && /* We talk plaintext */
1038 block_popups) /* Policy allows */
1040 block_popups_now = 1;
1042 * Filter the part of the body that came in the same read
1043 * as the last headers:
1045 filter_popups(csp->iob->cur);
1048 #endif /* def FEATURE_KILL_POPUPS */
1050 /* Buffer and pcrs filter this if appropriate. */
1052 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1053 !http->ssl && /* We talk plaintext */
1054 pcrs_filter) /* Policy allows */
1056 content_filter = pcrs_filter_response;
1059 /* Buffer and gif_deanimate this if appropriate. */
1061 if ((csp->content_type & CT_GIF) && /* It's a image/gif MIME-Type */
1062 !http->ssl && /* We talk plaintext */
1063 gif_deanimate) /* Policy allows */
1065 content_filter = gif_deanimate_response;
1070 * Only write if we're not buffering for content modification
1072 if (!content_filter && ((write_socket(csp->cfd, hdr, n) != n)
1073 || (n = flush_socket(csp->cfd, csp) < 0)))
1075 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
1077 /* the write failed, so don't bother
1078 * mentioning it to the client...
1079 * it probably can't hear us anyway.
1085 if(!content_filter) byte_count += n;
1087 /* we're finished with the server's header */
1092 /* If this was a MS IIS/5 hack then it means
1093 * the server has already closed the
1094 * connection. Nothing more to read. Time
1105 return; /* huh? we should never get here */
1108 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
1109 csp->ip_addr_str, http->cmd, byte_count);
1113 /*********************************************************************
1117 * Description : This is little more than chat. We only "serve" to
1118 * to close any socket that chat may have opened.
1121 * 1 : csp = Current client state (buffers, headers, etc...)
1125 *********************************************************************/
1127 void serve(struct client_state *csp)
1128 #else /* ifndef AMIGA */
1129 static void serve(struct client_state *csp)
1130 #endif /* def AMIGA */
1133 close_socket(csp->cfd);
1137 close_socket(csp->sfd);
1146 /*********************************************************************
1148 * Function : server_thread
1150 * Description : We only exist to call `serve' in a threaded environment.
1153 * 1 : data = Current client state (buffers, headers, etc...)
1155 * Returns : Always 0.
1157 *********************************************************************/
1158 static int32 server_thread(void *data)
1160 serve((struct client_state *) data);
1167 /*********************************************************************
1171 * Description : Load the config file and start the listen loop.
1172 * This function is a lot more *sane* with the `load_config'
1173 * and `listen_loop' functions; although it stills does
1174 * a *little* too much for my taste.
1177 * 1 : argc = Number of parameters (including $0).
1178 * 2 : argv = Array of (char *)'s to the parameters.
1180 * Returns : 1 if : can't open config file, unrecognized directive,
1181 * stats requested in multi-thread mode, can't open the
1182 * log file, can't open the jar file, listen port is invalid,
1183 * any load fails, and can't bind port.
1185 * Else main never returns, the process must be signaled
1186 * to terminate execution. Or, on Windows, use the
1187 * "File", "Exit" menu option.
1189 *********************************************************************/
1191 int real_main(int argc, const char *argv[])
1193 int main(int argc, const char *argv[])
1198 "AmiTCP:db/junkbuster/config"
1199 #elif !defined(_WIN32)
1206 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1207 if ((argc >= 2) && (strcmp(argv[1], "--help")==0))
1209 printf("JunkBuster proxy version " VERSION ".\n\n"
1210 "Usage: %s [configfile]\n\n"
1211 "See " HOME_PAGE_URL " for details.\n"
1212 "This program is distributed under the GNU GPL, version 2 or later.\n",
1216 if ((argc >= 2) && (strcmp(argv[1], "--version")==0))
1218 printf(VERSION "\n");
1221 #endif /* !defined(_WIN32) || defined(_WIN_CONSOLE) */
1228 configfile = argv[1];
1235 #elif defined(_WIN32)
1241 signal(SIGPIPE, SIG_IGN);
1242 signal(SIGCHLD, SIG_IGN);
1244 #else /* ifdef _WIN32 */
1245 # ifdef _WIN_CONSOLE
1247 * We *are* in a windows console app.
1248 * Print a verbose messages about FAQ's and such
1250 printf(win32_blurb);
1251 # endif /* def _WIN_CONSOLE */
1252 #endif /* def _WIN32 */
1263 /*********************************************************************
1265 * Function : listen_loop
1267 * Description : bind the listen port and enter a "FOREVER" listening loop.
1273 *********************************************************************/
1274 static void listen_loop(void)
1276 struct client_state *csp = NULL;
1278 struct configuration_spec * config;
1280 config = load_config();
1282 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1283 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1285 bfd = bind_port(config->haddr, config->hport);
1289 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1290 "- There may be another junkbuster or some other "
1291 "proxy running on port %d",
1292 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1293 config->hport, config->hport
1295 /* shouldn't get here */
1299 config->need_bind = 0;
1304 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
1305 while (waitpid(-1, NULL, WNOHANG) > 0)
1307 /* zombie children */
1309 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
1312 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
1314 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
1321 csp->config = config = load_config();
1323 if ( config->need_bind )
1326 * Since we were listening to the "old port", we will not see
1327 * a "listen" param change until the next IJB request. So, at
1328 * least 1 more request must be made for us to find the new
1329 * setting. I am simply closing the old socket and binding the
1332 * Which-ever is correct, we will serve 1 more page via the
1333 * old settings. This should probably be a "show-proxy-args"
1334 * request. This should not be a so common of an operation
1335 * that this will hurt people's feelings.
1340 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1341 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1342 bfd = bind_port(config->haddr, config->hport);
1346 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1347 "- There may be another junkbuster or some other "
1348 "proxy running on port %d",
1349 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1350 config->hport, config->hport
1352 /* shouldn't get here */
1356 config->need_bind = 0;
1359 log_error(LOG_LEVEL_CONNECT, "accept connection ... ");
1361 if (!accept_connection(csp, bfd))
1363 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
1376 log_error(LOG_LEVEL_CONNECT, "OK");
1379 #ifdef FEATURE_TOGGLE
1380 /* by haroon - most of credit to srt19170 */
1381 csp->toggled_on = g_bToggleIJB;
1382 #endif /* def FEATURE_TOGGLE */
1384 if (run_loader(csp))
1386 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
1387 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1391 if (block_acl(NULL,csp))
1393 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
1394 close_socket(csp->cfd);
1398 #endif /* def FEATURE_ACL */
1400 /* add it to the list of clients */
1401 csp->next = clients->next;
1402 clients->next = csp;
1404 if (config->multi_threaded)
1408 /* this is a switch () statment in the C preprocessor - ugh */
1409 #undef SELECTED_ONE_OPTION
1411 /* Use Pthreads in preference to native code */
1412 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
1413 #define SELECTED_ONE_OPTION
1415 pthread_t the_thread;
1416 pthread_attr_t attrs;
1418 pthread_attr_init(&attrs);
1419 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
1420 child_id = (pthread_create(&the_thread, &attrs,
1421 (void*)serve, csp) ? -1 : 0);
1422 pthread_attr_destroy(&attrs);
1426 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
1427 #define SELECTED_ONE_OPTION
1428 child_id = _beginthread(
1434 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
1435 #define SELECTED_ONE_OPTION
1437 thread_id tid = spawn_thread
1438 (server_thread, "server", B_NORMAL_PRIORITY, csp);
1440 if ((tid >= 0) && (resume_thread(tid) == B_OK))
1442 child_id = (int) tid;
1451 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
1452 #define SELECTED_ONE_OPTION
1453 csp->cfd = ReleaseSocket(csp->cfd, -1);
1454 if((child_id = (int)CreateNewProcTags(
1455 NP_Entry, (ULONG)server_thread,
1456 NP_Output, Output(),
1457 NP_CloseOutput, FALSE,
1458 NP_Name, (ULONG)"junkbuster child",
1459 NP_StackSize, 200*1024,
1463 ((struct Task *)child_id)->tc_UserData = csp;
1464 Signal((struct Task *)child_id, SIGF_SINGLE);
1469 #if !defined(SELECTED_ONE_OPTION)
1472 /* This block is only needed when using fork().
1473 * When using threads, the server thread was
1474 * created and run by the call to _beginthread().
1476 if (child_id == 0) /* child */
1482 else if (child_id > 0) /* parent */
1484 /* in a fork()'d environment, the parent's
1485 * copy of the client socket and the CSP
1489 #if !defined(_WIN32) && defined(__CYGWIN__)
1491 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
1492 close_socket(csp->cfd);
1497 #undef SELECTED_ONE_OPTION
1498 /* end of cpp switch () */
1500 if (child_id < 0) /* failed */
1502 char buf[BUFFER_SIZE];
1504 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
1506 sprintf(buf , "JunkBuster: can't fork: errno = %d", errno);
1508 write_socket(csp->cfd, buf, strlen(buf));
1509 close_socket(csp->cfd);