1 const char jcc_rcs[] = "$Id: jcc.c,v 1.29 2001/07/24 12:47:06 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 1.29 2001/07/24 12:47:06 oes
37 * Applied BeOS support update by Eugenia
39 * Revision 1.28 2001/07/23 13:26:12 oes
40 * Fixed bug in popup-killing for the first read that caused binary garbage to be sent between headers and body
42 * Revision 1.27 2001/07/19 19:09:47 haroon
43 * - Added code to take care of the situation where while processing the first
44 * server response (which includes the server header), after finding the end
45 * of the headers we were not looking past the end of the headers for
46 * content modification. I enabled it for filter_popups.
47 * Someone else should look to see if other similar operations should be
48 * done to the discarded portion of the buffer.
50 * Note 2001/07/20: No, the other content modification mechanisms will process
51 * the whole iob later anyway. --oes
53 * Revision 1.26 2001/07/18 12:31:36 oes
56 * Revision 1.25 2001/07/15 19:43:49 jongfoster
57 * Supports POSIX threads.
58 * Also removed some unused #includes.
60 * Revision 1.24 2001/07/13 14:00:40 oes
61 * - Generic content modification scheme:
62 * Each feature has its own applicability flag that is set
63 * from csp->action->flags.
64 * Replaced the "filtering" int flag , by a function pointer
65 * "content_filter" to the function that will do the content
66 * modification. If it is != NULL, the document will be buffered
67 * and processed through *content_filter, which must set
68 * csp->content_length and return a modified copy of the body
69 * or return NULL (on failiure).
70 * - Changed csp->is_text to the more generic bitmap csp->content_type
71 * which can currently take the valued CT_TEXT or CT_GIF
73 * - Removed all #ifdef PCRS
75 * Revision 1.23 2001/07/02 02:28:25 iwanttokeepanon
76 * Added "#ifdef ACL_FILES" conditional compilation to line 1291 to exclude
77 * the `block_acl' call. This prevents a compilation error when the user
78 * does not wish to use the "ACL" feature.
80 * Revision 1.22 2001/06/29 21:45:41 oes
81 * Indentation, CRLF->LF, Tab-> Space
83 * Revision 1.21 2001/06/29 13:29:36 oes
84 * - Cleaned up, improved comments
85 * - Unified all possible interceptors (CGI,
86 * block, trust, fast_redirect) in one
87 * place, with one (CGI) answer generation
88 * mechansim. Much clearer now.
89 * - Removed the GIF image generation, which
90 * is now done in filters.c:block_url()
91 * - Made error conditions like domain lookup
92 * failiure or (various) problems while talking
93 * to the server use cgi.c:error_response()
94 * instead of generating HTML/HTTP in chat() (yuck!)
95 * - Removed logentry from cancelled commit
97 * Revision 1.20 2001/06/09 10:55:28 jongfoster
98 * Changing BUFSIZ ==> BUFFER_SIZE
100 * Revision 1.19 2001/06/07 23:12:52 jongfoster
101 * Replacing function pointer in struct gateway with a directly
102 * called function forwarded_connect().
103 * Replacing struct gateway with struct forward_spec
105 * Revision 1.18 2001/06/03 19:12:16 oes
106 * introduced new cgi handling
108 * Revision 1.17 2001/06/01 20:07:23 jongfoster
109 * Now uses action +image-blocker{} rather than config->tinygif
111 * Revision 1.16 2001/06/01 18:49:17 jongfoster
112 * Replaced "list_share" with "list" - the tiny memory gain was not
113 * worth the extra complexity.
115 * Revision 1.15 2001/05/31 21:24:47 jongfoster
116 * Changed "permission" to "action" throughout.
117 * Removed DEFAULT_USER_AGENT - it must now be specified manually.
118 * Moved vanilla wafer check into chat(), since we must now
119 * decide whether or not to add it based on the URL.
121 * Revision 1.14 2001/05/29 20:14:01 joergs
122 * AmigaOS bugfix: PCRS needs a lot of stack, stacksize for child threads
125 * Revision 1.13 2001/05/29 09:50:24 jongfoster
126 * Unified blocklist/imagelist/permissionslist.
127 * File format is still under discussion, but the internal changes
130 * Also modified interceptor behaviour:
131 * - We now intercept all URLs beginning with one of the following
132 * prefixes (and *only* these prefixes):
134 * * http://ijbswa.sf.net/config/
135 * * http://ijbswa.sourceforge.net/config/
136 * - New interceptors "home page" - go to http://i.j.b/ to see it.
137 * - Internal changes so that intercepted and fast redirect pages
138 * are not replaced with an image.
139 * - Interceptors now have the option to send a binary page direct
140 * to the client. (i.e. ijb-send-banner uses this)
141 * - Implemented show-url-info interceptor. (Which is why I needed
142 * the above interceptors changes - a typical URL is
143 * "http://i.j.b/show-url-info?url=www.somesite.com/banner.gif".
144 * The previous mechanism would not have intercepted that, and
145 * if it had been intercepted then it then it would have replaced
148 * Revision 1.12 2001/05/27 22:17:04 oes
150 * - re_process_buffer no longer writes the modified buffer
151 * to the client, which was very ugly. It now returns the
152 * buffer, which it is then written by chat.
154 * - content_length now adjusts the Content-Length: header
155 * for modified documents rather than crunch()ing it.
156 * (Length info in csp->content_length, which is 0 for
157 * unmodified documents)
159 * - For this to work, sed() is called twice when filtering.
161 * Revision 1.11 2001/05/26 17:27:53 jongfoster
162 * Added support for CLF and fixed LOG_LEVEL_LOG.
163 * Also did CRLF->LF fix of my previous patch.
165 * Revision 1.10 2001/05/26 15:26:15 jongfoster
166 * ACL feature now provides more security by immediately dropping
167 * connections from untrusted hosts.
169 * Revision 1.9 2001/05/26 00:28:36 jongfoster
170 * Automatic reloading of config file.
171 * Removed obsolete SIGHUP support (Unix) and Reload menu option (Win32).
172 * Most of the global variables have been moved to a new
173 * struct configuration_spec, accessed through csp->config->globalname
174 * Most of the globals remaining are used by the Win32 GUI.
176 * Revision 1.8 2001/05/25 22:43:18 jongfoster
177 * Fixing minor memory leak and buffer overflow.
179 * Revision 1.7 2001/05/25 22:34:30 jongfoster
182 * Revision 1.6 2001/05/23 00:13:58 joergs
183 * AmigaOS support fixed.
185 * Revision 1.5 2001/05/22 18:46:04 oes
187 * - Enabled filtering banners by size rather than URL
188 * by adding patterns that replace all standard banner
189 * sizes with the "Junkbuster" gif to the re_filterfile
191 * - Enabled filtering WebBugs by providing a pattern
192 * which kills all 1x1 images
194 * - Added support for PCRE_UNGREEDY behaviour to pcrs,
195 * which is selected by the (nonstandard and therefore
196 * capital) letter 'U' in the option string.
197 * It causes the quantifiers to be ungreedy by default.
198 * Appending a ? turns back to greedy (!).
200 * - Added a new interceptor ijb-send-banner, which
201 * sends back the "Junkbuster" gif. Without imagelist or
202 * MSIE detection support, or if tinygif = 1, or the
203 * URL isn't recognized as an imageurl, a lame HTML
204 * explanation is sent instead.
206 * - Added new feature, which permits blocking remote
207 * script redirects and firing back a local redirect
209 * The feature is conditionally compiled, i.e. it
210 * can be disabled with --disable-fast-redirects,
211 * plus it must be activated by a "fast-redirects"
212 * line in the config file, has its own log level
213 * and of course wants to be displayed by show-proxy-args
214 * Note: Boy, all the #ifdefs in 1001 locations and
215 * all the fumbling with configure.in and acconfig.h
216 * were *way* more work than the feature itself :-(
218 * - Because a generic redirect template was needed for
219 * this, tinygif = 3 now uses the same.
221 * - Moved GIFs, and other static HTTP response templates
226 * - Removed some >400 CRs again (Jon, you really worked
229 * Revision 1.4 2001/05/21 19:34:01 jongfoster
230 * Made failure to bind() a fatal error.
232 * Revision 1.3 2001/05/20 01:21:20 jongfoster
233 * Version 2.9.4 checkin.
234 * - Merged popupfile and cookiefile, and added control over PCRS
235 * filtering, in new "permissionsfile".
236 * - Implemented LOG_LEVEL_FATAL, so that if there is a configuration
237 * file error you now get a message box (in the Win32 GUI) rather
238 * than the program exiting with no explanation.
239 * - Made killpopup use the PCRS MIME-type checking and HTTP-header
241 * - Removed tabs from "config"
242 * - Moved duplicated url parsing code in "loaders.c" to a new funcition.
243 * - Bumped up version number.
245 * Revision 1.2 2001/05/17 22:34:44 oes
246 * - Added hint on GIF char array generation to jcc.c
247 * - Cleaned CRLF's from the sources and related files
248 * - Repaired logging for REF and FRC
250 * Revision 1.1.1.1 2001/05/15 13:58:56 oes
251 * Initial import of version 2.9.3 source tree
254 *********************************************************************/
260 #include <sys/types.h>
267 #ifdef FEATURE_PTHREAD
269 #endif /* def FEATURE_PTHREAD */
272 # ifndef FEATURE_PTHREAD
273 # include <windows.h>
274 # include <process.h>
275 # endif /* ndef FEATURE_PTHREAD */
278 # ifndef _WIN_CONSOLE
280 # endif /* ndef _WIN_CONSOLE */
282 #else /* ifndef _WIN32 */
285 # include <sys/time.h>
286 # include <sys/wait.h>
287 # include <sys/stat.h>
291 # include <socket.h> /* BeOS has select() for sockets only. */
292 # include <OS.h> /* declarations for threads and stuff. */
306 #include "showargs.h"
308 #include "killpopup.h"
309 #include "miscutil.h"
311 #include "jbsockets.h"
316 const char jcc_h_rcs[] = JCC_H_VERSION;
317 const char project_h_rcs[] = PROJECT_H_VERSION;
319 struct client_state clients[1];
320 struct file_list files[1];
323 int urls_read = 0; /* total nr of urls read inc rejected */
324 int urls_rejected = 0; /* total nr of urls rejected */
325 #endif /* def STATISTICS */
328 static void listen_loop(void);
329 static void chat(struct client_state *csp);
331 void serve(struct client_state *csp);
332 #else /* ifndef AMIGA */
333 static void serve(struct client_state *csp);
334 #endif /* def AMIGA */
337 static int32 server_thread(void *data);
338 #endif /* def __BEOS__ */
341 #define sleep(N) Sleep(((N) * 1000))
345 /* The vanilla wafer. */
346 static const char VANILLA_WAFER[] =
347 "NOTICE=TO_WHOM_IT_MAY_CONCERN_"
348 "Do_not_send_me_any_copyrighted_information_other_than_the_"
349 "document_that_I_am_requesting_or_any_of_its_necessary_components._"
350 "In_particular_do_not_send_me_any_cookies_that_"
351 "are_subject_to_a_claim_of_copyright_by_anybody._"
352 "Take_notice_that_I_refuse_to_be_bound_by_any_license_condition_"
353 "(copyright_or_otherwise)_applying_to_any_cookie._";
356 /*********************************************************************
360 * Description : Once a connection to the client has been accepted,
361 * this function is called (via serve()) to handle the
362 * main business of the communication. When this
363 * function returns, the caller must close the client
367 * 1 : csp = Current client state (buffers, headers, etc...)
369 * Returns : On success, the number of bytes written are returned (zero
370 * indicates nothing was written). On error, -1 is returned,
371 * and errno is set appropriately. If count is zero and the
372 * file descriptor refers to a regular file, 0 will be
373 * returned without causing any other effect. For a special
374 * file, the results are not portable.
376 *********************************************************************/
377 static void chat(struct client_state *csp)
380 * This next lines are a little ugly, but they simplifies the if statements below.
381 * Basically if TOGGLE, then we want the if to test "csp->toggled_on", else we don't
382 * And if FORCE_LOAD, then we want the if to test "csp->toggled_on", else we don't
385 # define IS_TOGGLED_ON_AND (csp->toggled_on) &&
386 #else /* ifndef TOGGLE */
387 # define IS_TOGGLED_ON_AND
388 #endif /* ndef TOGGLE */
390 # define IS_NOT_FORCED_AND (!csp->force) &&
391 #else /* ifndef FORCE_LOAD */
392 # define IS_NOT_FORCED_AND
393 #endif /* def FORCE_LOAD */
395 #define IS_ENABLED_AND IS_TOGGLED_ON_AND IS_NOT_FORCED_AND
397 char buf[BUFFER_SIZE];
401 int n, maxfd, server_body;
402 int ms_iis5_hack = 0;
404 const struct forward_spec * fwd;
405 struct http_request *http;
407 int block_popups; /* bool, 1==will block popups */
408 int block_popups_now = 0; /* bool, 1==currently blocking popups */
409 #endif /* def KILLPOPUPS */
411 int pcrs_filter; /* bool, 1==will filter through pcrs */
412 int gif_deanimate; /* bool, 1==will deanimate gifs */
414 /* Function that does the content filtering for the current request */
415 char *(*content_filter)() = NULL;
417 /* Skeleton for HTTP response, if we should intercept the request */
418 struct http_response *rsp;
423 * Read the client's request. Note that since we're not using select() we
424 * could get blocked here if a client connected, then didn't say anything!
429 n = read_socket(csp->cfd, buf, sizeof(buf));
431 if (n <= 0) break; /* error! */
433 add_to_iob(csp, buf, n);
435 req = get_header(csp);
439 break; /* no HTTP request! */
444 continue; /* more to come! */
448 /* If this request contains the FORCE_PREFIX,
449 * better get rid of it now and set the force flag --oes
452 if (strstr(req, FORCE_PREFIX))
454 strclean(req, FORCE_PREFIX);
455 log_error(LOG_LEVEL_FORCE, "Enforcing request \"%s\".\n", req);
462 #endif /* def FORCE_LOAD */
464 parse_http_request(req, http, csp);
469 if (http->cmd == NULL)
471 strcpy(buf, CHEADER);
472 write_socket(csp->cfd, buf, strlen(buf));
474 log_error(LOG_LEVEL_CLF, "%s - - [%T] \" \" 400 0", csp->ip_addr_str);
479 /* decide how to route the HTTP request */
481 if ((fwd = forward_url(http, csp)) == NULL)
483 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
484 /* Never get here - LOG_LEVEL_FATAL causes program exit */
487 /* build the http request to send to the server
488 * we have to do one of the following:
490 * create = use the original HTTP request to create a new
491 * HTTP request that has only the path component
492 * without the http://domainspec
493 * pass = pass the original HTTP request unchanged
495 * drop = drop the HTTP request
500 * +--------+--------+
502 * 0 | create | drop |
504 * Forwarding +--------+--------+
508 * +--------+--------+
512 if (fwd->forward_host)
514 /* if forwarding, just pass the request as is */
515 enlist(csp->headers, http->cmd);
521 /* otherwise elide the host information from the url */
523 p = strsav(p, http->gpc);
525 p = strsav(p, http->path);
527 p = strsav(p, http->ver);
528 enlist(csp->headers, p);
533 /* decide what we're to do with cookies */
536 if (!csp->toggled_on)
538 /* Most compatible set of actions (i.e. none) */
539 init_current_action(csp->action);
542 #endif /* ndef TOGGLE */
544 url_actions(http, csp);
549 * If we're logging cookies in a cookie jar, and the user has not
550 * supplied any wafers, and the user has not told us to suppress the
551 * vanilla wafer, then send the vanilla wafer.
553 if ((csp->config->jarfile != NULL)
554 && (csp->action->multi[ACTION_MULTI_WAFER]->next == NULL)
555 && ((csp->action->flags & ACTION_VANILLA_WAFER) != 0))
557 enlist(csp->action->multi[ACTION_MULTI_WAFER], VANILLA_WAFER);
559 #endif /* def JAR_FILES */
562 block_popups = ((csp->action->flags & ACTION_NO_POPUPS) != 0);
563 #endif /* def KILLPOPUPS */
565 pcrs_filter = (csp->rlist != NULL) && /* There are expressions to be used */
566 ((csp->action->flags & ACTION_FILTER) != 0);
568 gif_deanimate = ((csp->action->flags & ACTION_DEANIMATE) != 0);
570 /* grab the rest of the client's headers */
574 if ( ( p = get_header(csp) ) && ( *p == '\0' ) )
576 n = read_socket(csp->cfd, buf, sizeof(buf));
579 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
582 add_to_iob(csp, buf, n);
586 if (p == NULL) break;
588 enlist(csp->headers, p);
592 /* We have a request. */
594 hdr = sed(client_patterns, add_client_headers, csp);
595 destroy_list(csp->headers);
598 * Now, check to see if we need to intercept it, i.e.
603 /* a CGI call was detected and answered */
604 (NULL != (rsp = dispatch_cgi(csp)))
606 /* or we are enabled and... */
609 /* ..the request was blocked */
610 ( NULL != (rsp = block_url(csp)))
614 || ( NULL != (rsp = trust_url(csp)))
617 /* ..or a fast redirect kicked in */
618 #ifdef FAST_REDIRECTS
619 || (((csp->action->flags & ACTION_FAST_REDIRECTS) != 0) &&
620 (NULL != (rsp = redirect_url(csp))))
621 #endif /* def FAST_REDIRECTS */
625 /* Write the answer to the client */
626 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
627 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
629 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
633 /* Count as a rejected request */
635 #endif /* def STATISTICS */
637 /* Log (FIXME: All intercept reasons apprear as "crunch" with Status 200) */
638 log_error(LOG_LEVEL_GPC, "%s%s crunch!", http->hostport, http->path);
639 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 3", csp->ip_addr_str, http->cmd);
641 /* Clean up and return */
642 free_http_response(rsp);
647 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
649 if (fwd->forward_host)
651 log_error(LOG_LEVEL_CONNECT, "via %s:%d to: %s",
652 fwd->forward_host, fwd->forward_port, http->hostport);
656 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
659 /* here we connect to the server, gateway, or the forwarder */
661 csp->sfd = forwarded_connect(fwd, http, csp);
665 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
670 rsp = error_response(csp, "no-such-domain", errno);
672 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 404 0",
673 csp->ip_addr_str, http->cmd);
677 rsp = error_response(csp, "connect-failed", errno);
679 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
680 csp->ip_addr_str, http->cmd);
683 /* Write the answer to the client */
686 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
687 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
689 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
693 free_http_response(rsp);
698 log_error(LOG_LEVEL_CONNECT, "OK");
700 if (fwd->forward_host || (http->ssl == 0))
702 /* write the client's (modified) header to the server
703 * (along with anything else that may be in the buffer)
708 if ((write_socket(csp->sfd, hdr, n) != n)
709 || (flush_socket(csp->sfd, csp ) < 0))
711 log_error(LOG_LEVEL_CONNECT, "write header to: %s failed: %E",
714 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
715 csp->ip_addr_str, http->cmd);
717 rsp = error_response(csp, "connect-failed", errno);
721 if ((write_socket(csp->cfd, rsp->head, n) != n)
722 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
724 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
728 free_http_response(rsp);
736 * We're running an SSL tunnel and we're not forwarding,
737 * so just send the "connect succeeded" message to the
738 * client, flush the rest, and get out of the way.
740 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 2\n",
741 csp->ip_addr_str, http->cmd);
743 if (write_socket(csp->cfd, CSUCCEED, sizeof(CSUCCEED)-1) < 0)
751 /* we're finished with the client's header */
754 maxfd = ( csp->cfd > csp->sfd ) ? csp->cfd : csp->sfd;
756 /* pass data between the client and server
757 * until one or the other shuts down the connection.
766 FD_SET(csp->cfd, &rfds);
767 FD_SET(csp->sfd, &rfds);
769 n = select(maxfd+1, &rfds, NULL, NULL, NULL);
773 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
777 /* this is the body of the browser's request
778 * just read it and write it.
781 if (FD_ISSET(csp->cfd, &rfds))
783 n = read_socket(csp->cfd, buf, sizeof(buf));
787 break; /* "game over, man" */
790 if (write_socket(csp->sfd, buf, n) != n)
792 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
799 * The server wants to talk. It could be the header or the body.
800 * If `hdr' is null, then it's the header otherwise it's the body.
801 * FIXME: Does `hdr' really mean `host'? No.
805 if (FD_ISSET(csp->sfd, &rfds))
808 n = read_socket(csp->sfd, buf, sizeof(buf) - 1);
812 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
814 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 503 0",
815 csp->ip_addr_str, http->cmd);
817 rsp = error_response(csp, "connect-failed", errno);
821 if ((write_socket(csp->cfd, rsp->head, rsp->head_length) != rsp->head_length)
822 || (write_socket(csp->cfd, rsp->body, rsp->content_length) != rsp->content_length))
824 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
828 free_http_response(rsp);
832 /* Add a trailing zero. This lets filter_popups
833 * use string operations.
838 /* Filter the popups on this read. */
839 if (block_popups_now)
841 filter_popups(buf, n);
843 #endif /* def KILLPOPUPS */
845 /* Normally, this would indicate that we've read
846 * as much as the server has sent us and we can
847 * close the client connection. However, Microsoft
848 * in its wisdom has released IIS/5 with a bug that
849 * prevents it from sending the trailing \r\n in
850 * a 302 redirect header (and possibly other headers).
851 * To work around this if we've haven't parsed
852 * a full header we'll append a trailing \r\n
853 * and see if this now generates a valid one.
855 * This hack shouldn't have any impacts. If we've
856 * already transmitted the header or if this is a
857 * SSL connection, then we won't bother with this
858 * hack. So we only work on partially received
859 * headers. If we append a \r\n and this still
860 * doesn't generate a valid header, then we won't
861 * transmit anything to the client.
866 if (server_body || http->ssl)
869 * If we have been buffering up the document,
870 * now is the time to apply content modification
871 * and send the result to the client.
876 * If the content filter fails, use the original
878 * (see p != NULL ? p : csp->iob->cur below)
880 if (NULL == (p = (*content_filter)(csp)))
882 csp->content_length = csp->iob->eod - csp->iob->cur;
885 hdr = sed(server_patterns, add_server_headers, csp);
888 if ((write_socket(csp->cfd, hdr, n) != n)
889 || (write_socket(csp->cfd, p != NULL ? p : csp->iob->cur, csp->content_length) != csp->content_length))
891 log_error(LOG_LEVEL_CONNECT, "write modified content to client failed: %E");
899 break; /* "game over, man" */
903 * This is NOT the body, so
904 * Let's pretend the server just sent us a blank line.
906 n = sprintf(buf, "\r\n");
909 * Now, let the normal header parsing algorithm below do its
910 * job. If it fails, we'll exit instead of continuing.
917 * If this is an SSL connection or we're in the body
918 * of the server document, just write it to the client,
919 * unless we need to buffer the body for later content-filtering
922 if (server_body || http->ssl)
926 add_to_iob(csp, buf, n);
930 if (write_socket(csp->cfd, buf, n) != n)
932 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
941 /* we're still looking for the end of the
942 * server's header ... (does that make header
943 * parsing an "out of body experience" ?
946 /* buffer up the data we just read */
947 add_to_iob(csp, buf, n);
949 /* get header lines from the iob */
951 while ((p = get_header(csp)))
955 /* see following note */
958 enlist(csp->headers, p);
962 /* NOTE: there are no "empty" headers so
963 * if the pointer `p' is not NULL we must
964 * assume that we reached the end of the
965 * buffer before we hit the end of the header.
972 /* Well, we tried our MS IIS/5
973 * hack and it didn't work.
974 * The header is incomplete
975 * and there isn't anything
976 * we can do about it.
982 /* Since we have to wait for
983 * more from the server before
984 * we can parse the headers
985 * we just continue here.
991 /* we have now received the entire header.
992 * filter it and send the result to the client
995 hdr = sed(server_patterns, add_server_headers, csp);
998 /* write the server's (modified) header to
999 * the client (along with anything else that
1000 * may be in the buffer)
1004 /* Start blocking popups if appropriate. */
1006 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1007 !http->ssl && /* We talk plaintext */
1008 block_popups) /* Policy allows */
1010 block_popups_now = 1;
1012 * Filter the part of the body that came in the same read
1013 * as the last headers:
1015 filter_popups(csp->iob->cur, csp->iob->eod - csp->iob->cur);
1018 #endif /* def KILLPOPUPS */
1020 /* Buffer and pcrs filter this if appropriate. */
1022 if ((csp->content_type & CT_TEXT) && /* It's a text / * MIME-Type */
1023 !http->ssl && /* We talk plaintext */
1024 pcrs_filter) /* Policy allows */
1026 content_filter = pcrs_filter_response;
1029 /* Buffer and gif_deanimate this if appropriate. */
1031 if ((csp->content_type & CT_GIF) && /* It's a image/gif MIME-Type */
1032 !http->ssl && /* We talk plaintext */
1033 gif_deanimate) /* Policy allows */
1035 content_filter = gif_deanimate_response;
1040 * Only write if we're not buffering for content modification
1042 if (!content_filter && ((write_socket(csp->cfd, hdr, n) != n)
1043 || (n = flush_socket(csp->cfd, csp) < 0)))
1045 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
1047 /* the write failed, so don't bother
1048 * mentioning it to the client...
1049 * it probably can't hear us anyway.
1055 !content_filter && (byte_count += n);
1057 /* we're finished with the server's header */
1062 /* If this was a MS IIS/5 hack then it means
1063 * the server has already closed the
1064 * connection. Nothing more to read. Time
1075 return; /* huh? we should never get here */
1078 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %d",
1079 csp->ip_addr_str, http->cmd, byte_count);
1083 /*********************************************************************
1087 * Description : This is little more than chat. We only "serve" to
1088 * to close any socket that chat may have opened.
1091 * 1 : csp = Current client state (buffers, headers, etc...)
1095 *********************************************************************/
1097 void serve(struct client_state *csp)
1098 #else /* ifndef AMIGA */
1099 static void serve(struct client_state *csp)
1100 #endif /* def AMIGA */
1103 close_socket(csp->cfd);
1107 close_socket(csp->sfd);
1116 /*********************************************************************
1118 * Function : server_thread
1120 * Description : We only exist to call `serve' in a threaded environment.
1123 * 1 : data = Current client state (buffers, headers, etc...)
1125 * Returns : Always 0.
1127 *********************************************************************/
1128 static int32 server_thread(void *data)
1130 serve((struct client_state *) data);
1137 /*********************************************************************
1141 * Description : Load the config file and start the listen loop.
1142 * This function is a lot more *sane* with the `load_config'
1143 * and `listen_loop' functions; although it stills does
1144 * a *little* too much for my taste.
1147 * 1 : argc = Number of parameters (including $0).
1148 * 2 : argv = Array of (char *)'s to the parameters.
1150 * Returns : 1 if : can't open config file, unrecognized directive,
1151 * stats requested in multi-thread mode, can't open the
1152 * log file, can't open the jar file, listen port is invalid,
1153 * any load fails, and can't bind port.
1155 * Else main never returns, the process must be signaled
1156 * to terminate execution. Or, on Windows, use the
1157 * "File", "Exit" menu option.
1159 *********************************************************************/
1161 int _main(int argc, const char *argv[])
1163 int main(int argc, const char *argv[])
1168 "AmiTCP:db/junkbuster/config"
1169 #elif !defined(_WIN32)
1176 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
1177 if ((argc >= 2) && (strcmp(argv[1], "--help")==0))
1179 printf("JunkBuster proxy version " VERSION ".\n\n"
1180 "Usage: %s [configfile]\n\n"
1181 "See " HOME_PAGE_URL " for details.\n"
1182 "This program is distributed under the GNU GPL, version 2 or later.\n",
1186 if ((argc >= 2) && (strcmp(argv[1], "--version")==0))
1188 printf(VERSION "\n");
1191 #endif /* !defined(_WIN32) || defined(_WIN_CONSOLE) */
1198 configfile = argv[1];
1205 #elif defined(_WIN32)
1211 signal(SIGPIPE, SIG_IGN);
1212 signal(SIGCHLD, SIG_IGN);
1214 #else /* ifdef _WIN32 */
1215 # ifdef _WIN_CONSOLE
1217 * We *are* in a windows console app.
1218 * Print a verbose messages about FAQ's and such
1220 printf(win32_blurb);
1221 # endif /* def _WIN_CONSOLE */
1222 #endif /* def _WIN32 */
1233 /*********************************************************************
1235 * Function : listen_loop
1237 * Description : bind the listen port and enter a "FOREVER" listening loop.
1243 *********************************************************************/
1244 static void listen_loop(void)
1246 struct client_state *csp = NULL;
1248 struct configuration_spec * config;
1250 config = load_config();
1252 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1253 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1255 bfd = bind_port(config->haddr, config->hport);
1259 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1260 "- There may be another junkbuster or some other "
1261 "proxy running on port %d",
1262 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1263 config->hport, config->hport
1265 /* shouldn't get here */
1269 config->need_bind = 0;
1274 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA)
1275 while (waitpid(-1, NULL, WNOHANG) > 0)
1277 /* zombie children */
1279 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
1282 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
1284 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
1288 memset(csp, '\0', sizeof(*csp));
1293 csp->config = config = load_config();
1295 if ( config->need_bind )
1298 * Since we were listening to the "old port", we will not see
1299 * a "listen" param change until the next IJB request. So, at
1300 * least 1 more request must be made for us to find the new
1301 * setting. I am simply closing the old socket and binding the
1304 * Which-ever is correct, we will serve 1 more page via the
1305 * old settings. This should probably be a "show-proxy-args"
1306 * request. This should not be a so common of an operation
1307 * that this will hurt people's feelings.
1312 log_error(LOG_LEVEL_CONNECT, "bind (%s, %d)",
1313 config->haddr ? config->haddr : "INADDR_ANY", config->hport);
1314 bfd = bind_port(config->haddr, config->hport);
1318 log_error(LOG_LEVEL_FATAL, "can't bind %s:%d: %E "
1319 "- There may be another junkbuster or some other "
1320 "proxy running on port %d",
1321 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
1322 config->hport, config->hport
1324 /* shouldn't get here */
1328 config->need_bind = 0;
1331 log_error(LOG_LEVEL_CONNECT, "accept connection ... ");
1333 if (!accept_connection(csp, bfd))
1335 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
1348 log_error(LOG_LEVEL_CONNECT, "OK");
1352 /* by haroon - most of credit to srt19170 */
1353 csp->toggled_on = g_bToggleIJB;
1356 if (run_loader(csp))
1358 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
1359 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1363 if (block_acl(NULL,csp))
1365 log_error(LOG_LEVEL_CONNECT, "Connection dropped due to ACL");
1366 close_socket(csp->cfd);
1370 #endif /* def ACL_FILES */
1372 /* add it to the list of clients */
1373 csp->next = clients->next;
1374 clients->next = csp;
1376 if (config->multi_threaded)
1380 /* this is a switch () statment in the C preprocessor - ugh */
1381 #undef SELECTED_ONE_OPTION
1383 /* Use Pthreads in preference to native code */
1384 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
1385 #define SELECTED_ONE_OPTION
1387 pthread_t the_thread;
1388 pthread_attr_t attrs;
1390 pthread_attr_init(&attrs);
1391 child_id = (pthread_create(&the_thread, &attrs,
1392 (void*)serve, csp) ? -1 : 0);
1393 pthread_attr_destroy(&attrs);
1397 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
1398 #define SELECTED_ONE_OPTION
1399 child_id = _beginthread(
1405 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
1406 #define SELECTED_ONE_OPTION
1408 thread_id tid = spawn_thread
1409 (server_thread, "server", B_NORMAL_PRIORITY, csp);
1411 if ((tid >= 0) && (resume_thread(tid) == B_OK))
1413 child_id = (int) tid;
1422 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
1423 #define SELECTED_ONE_OPTION
1424 csp->cfd = ReleaseSocket(csp->cfd, -1);
1425 if((child_id = (int)CreateNewProcTags(
1426 NP_Entry, (ULONG)server_thread,
1427 NP_Output, Output(),
1428 NP_CloseOutput, FALSE,
1429 NP_Name, (ULONG)"junkbuster child",
1430 NP_StackSize, 200*1024,
1434 ((struct Task *)child_id)->tc_UserData = csp;
1435 Signal((struct Task *)child_id, SIGF_SINGLE);
1440 #if !defined(SELECTED_ONE_OPTION)
1443 /* This block is only needed when using fork().
1444 * When using threads, the server thread was
1445 * created and run by the call to _beginthread().
1447 if (child_id == 0) /* child */
1453 else if (child_id > 0) /* parent */
1455 /* in a fork()'d environment, the parent's
1456 * copy of the client socket and the CSP
1460 #if !defined(_WIN32) && defined(__CYGWIN__)
1462 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
1463 close_socket(csp->cfd);
1468 #undef SELECTED_ONE_OPTION
1469 /* end of cpp switch () */
1471 if (child_id < 0) /* failed */
1473 char buf[BUFFER_SIZE];
1475 log_error(LOG_LEVEL_ERROR, "can't fork: %E");
1477 sprintf(buf , "JunkBuster: can't fork: errno = %d", errno);
1479 write_socket(csp->cfd, buf, strlen(buf));
1480 close_socket(csp->cfd);