1 const char jcc_rcs[] = "$Id: jcc.c,v 1.253 2009/06/08 16:50:35 fabiankeil 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) 2001-2009 the SourceForge
10 * Privoxy team. http://www.privoxy.org/
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.
34 *********************************************************************/
40 #include <sys/types.h>
49 # ifndef FEATURE_PTHREAD
55 # endif /* ndef FEATURE_PTHREAD */
60 # endif /* ndef _WIN_CONSOLE */
61 # include "w32svrapi.h"
63 #else /* ifndef _WIN32 */
65 # if !defined (__OS2__)
67 # include <sys/wait.h>
68 # endif /* ndef __OS2__ */
69 # include <sys/time.h>
70 # include <sys/stat.h>
71 # include <sys/ioctl.h>
74 #include <sys/termios.h>
85 # include <socket.h> /* BeOS has select() for sockets only. */
86 # include <OS.h> /* declarations for threads and stuff. */
89 # if defined(__EMX__) || defined(__OS2__)
90 # include <sys/select.h> /* OS/2/EMX needs a little help with select */
95 #define bzero(B,N) memset(B,0x00,n)
110 #include "miscutil.h"
112 #include "jbsockets.h"
117 #include "urlmatch.h"
119 const char jcc_h_rcs[] = JCC_H_VERSION;
120 const char project_h_rcs[] = PROJECT_H_VERSION;
123 struct client_state clients[1];
124 struct file_list files[1];
126 #ifdef FEATURE_STATISTICS
127 int urls_read = 0; /* total nr of urls read inc rejected */
128 int urls_rejected = 0; /* total nr of urls rejected */
129 #endif /* def FEATURE_STATISTICS */
131 #ifdef FEATURE_GRACEFUL_TERMINATION
135 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
136 static void sig_handler(int the_signal);
138 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
139 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
140 static jb_err get_server_headers(struct client_state *csp);
141 static const char *crunch_reason(const struct http_response *rsp);
142 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp);
143 static char *get_request_line(struct client_state *csp);
144 static jb_err receive_client_request(struct client_state *csp);
145 static jb_err parse_client_request(struct client_state *csp);
146 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
147 static jb_err change_request_destination(struct client_state *csp);
148 static void chat(struct client_state *csp);
149 static void serve(struct client_state *csp);
150 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
151 static void usage(const char *myname);
153 static void initialize_mutexes(void);
154 static jb_socket bind_port_helper(struct configuration_spec *config);
155 static void listen_loop(void);
158 void serve(struct client_state *csp);
159 #else /* ifndef AMIGA */
160 static void serve(struct client_state *csp);
161 #endif /* def AMIGA */
164 static int32 server_thread(void *data);
165 #endif /* def __BEOS__ */
168 #define sleep(N) Sleep(((N) * 1000))
172 #define sleep(N) DosSleep(((N) * 100))
175 #ifdef MUTEX_LOCKS_AVAILABLE
177 * XXX: Does the locking stuff really belong in this file?
179 privoxy_mutex_t log_mutex;
180 privoxy_mutex_t log_init_mutex;
181 privoxy_mutex_t connection_reuse_mutex;
183 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
184 privoxy_mutex_t resolver_mutex;
185 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
187 #ifndef HAVE_GMTIME_R
188 privoxy_mutex_t gmtime_mutex;
189 #endif /* ndef HAVE_GMTIME_R */
191 #ifndef HAVE_LOCALTIME_R
192 privoxy_mutex_t localtime_mutex;
193 #endif /* ndef HAVE_GMTIME_R */
196 privoxy_mutex_t rand_mutex;
197 #endif /* ndef HAVE_RANDOM */
199 #endif /* def MUTEX_LOCKS_AVAILABLE */
202 const char *basedir = NULL;
203 const char *pidfile = NULL;
204 static int received_hup_signal = 0;
205 #endif /* defined unix */
207 /* HTTP snipplets. */
208 static const char CSUCCEED[] =
209 "HTTP/1.0 200 Connection established\r\n"
210 "Proxy-Agent: Privoxy/" VERSION "\r\n\r\n";
212 static const char CHEADER[] =
213 "HTTP/1.0 400 Invalid header received from client\r\n"
214 "Proxy-Agent: Privoxy " VERSION "\r\n"
215 "Content-Type: text/plain\r\n"
216 "Connection: close\r\n\r\n"
217 "Invalid header received from client.\r\n";
219 static const char FTP_RESPONSE[] =
220 "HTTP/1.0 400 Invalid request received from client\r\n"
221 "Content-Type: text/plain\r\n"
222 "Connection: close\r\n\r\n"
223 "Invalid request. Privoxy doesn't support FTP.\r\n";
225 static const char GOPHER_RESPONSE[] =
226 "HTTP/1.0 400 Invalid request received from client\r\n"
227 "Content-Type: text/plain\r\n"
228 "Connection: close\r\n\r\n"
229 "Invalid request. Privoxy doesn't support gopher.\r\n";
231 /* XXX: should be a template */
232 static const char MISSING_DESTINATION_RESPONSE[] =
233 "HTTP/1.0 400 Bad request received from client\r\n"
234 "Proxy-Agent: Privoxy " VERSION "\r\n"
235 "Content-Type: text/plain\r\n"
236 "Connection: close\r\n\r\n"
237 "Bad request. Privoxy was unable to extract the destination.\r\n";
239 /* XXX: should be a template */
240 static const char NO_SERVER_DATA_RESPONSE[] =
241 "HTTP/1.0 502 Server or forwarder response empty\r\n"
242 "Proxy-Agent: Privoxy " VERSION "\r\n"
243 "Content-Type: text/plain\r\n"
244 "Connection: close\r\n\r\n"
245 "Empty server or forwarder response.\r\n"
246 "The connection has been closed but Privoxy didn't receive any data.\r\n";
248 /* XXX: should be a template */
249 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
250 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
251 "Proxy-Agent: Privoxy " VERSION "\r\n"
252 "Content-Type: text/plain\r\n"
253 "Connection: close\r\n\r\n"
254 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
257 /* XXX: should be a template */
258 static const char NULL_BYTE_RESPONSE[] =
259 "HTTP/1.0 400 Bad request received from client\r\n"
260 "Proxy-Agent: Privoxy " VERSION "\r\n"
261 "Content-Type: text/plain\r\n"
262 "Connection: close\r\n\r\n"
263 "Bad request. Null byte(s) before end of request.\r\n";
266 /* XXX: should be a template */
267 static const char MESSED_UP_REQUEST_RESPONSE[] =
268 "HTTP/1.0 400 Malformed request after rewriting\r\n"
269 "Proxy-Agent: Privoxy " VERSION "\r\n"
270 "Content-Type: text/plain\r\n"
271 "Connection: close\r\n\r\n"
272 "Bad request. Messed up with header filters.\r\n";
274 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
275 "HTTP/1.0 503 Too many open connections\r\n"
276 "Proxy-Agent: Privoxy " VERSION "\r\n"
277 "Content-Type: text/plain\r\n"
278 "Connection: close\r\n\r\n"
279 "Maximum number of open connections reached.\r\n";
281 /* XXX: should be a template */
282 static const char CONNECTION_TIMEOUT_RESPONSE[] =
283 "HTTP/1.0 504 Connection timeout\r\n"
284 "Proxy-Agent: Privoxy " VERSION "\r\n"
285 "Content-Type: text/plain\r\n"
286 "Connection: close\r\n\r\n"
287 "The connection timed out.\r\n";
289 /* A function to crunch a response */
290 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
292 /* Crunch function flags */
293 #define CF_NO_FLAGS 0
294 /* Cruncher applies to forced requests as well */
295 #define CF_IGNORE_FORCE 1
296 /* Crunched requests are counted for the block statistics */
297 #define CF_COUNT_AS_REJECT 2
299 /* A crunch function and its flags */
302 const crunch_func_ptr cruncher;
306 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
308 /* Complete list of cruncher functions */
309 static const struct cruncher crunchers_all[] = {
310 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
311 { block_url, CF_COUNT_AS_REJECT },
313 { trust_url, CF_COUNT_AS_REJECT },
314 #endif /* def FEATURE_TRUST */
315 { redirect_url, CF_NO_FLAGS },
316 { dispatch_cgi, CF_IGNORE_FORCE},
320 /* Light version, used after tags are applied */
321 static const struct cruncher crunchers_light[] = {
322 { block_url, CF_COUNT_AS_REJECT },
323 { redirect_url, CF_NO_FLAGS },
329 * XXX: Don't we really mean
335 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
336 /*********************************************************************
338 * Function : sig_handler
340 * Description : Signal handler for different signals.
341 * Exit gracefully on TERM and INT
342 * or set a flag that will cause the errlog
343 * to be reopened by the main thread on HUP.
346 * 1 : the_signal = the signal cause this function to call
350 *********************************************************************/
351 static void sig_handler(int the_signal)
357 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
369 received_hup_signal = 1;
375 * We shouldn't be here, unless we catch signals
376 * in main() that we can't handle here!
378 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
386 /*********************************************************************
388 * Function : client_protocol_is_unsupported
390 * Description : Checks if the client used a known unsupported
391 * protocol and deals with it by sending an error
395 * 1 : csp = Current client state (buffers, headers, etc...)
396 * 2 : req = the first request line send by the client
398 * Returns : TRUE if an error response has been generated, or
399 * FALSE if the request doesn't look invalid.
401 *********************************************************************/
402 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
405 * If it's a FTP or gopher request, we don't support it.
407 * These checks are better than nothing, but they might
408 * not work in all configurations and some clients might
409 * have problems digesting the answer.
411 * They should, however, never cause more problems than
412 * Privoxy's old behaviour (returning the misleading HTML
415 * "Could not resolve http://(ftp|gopher)://example.org").
417 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
419 const char *response = NULL;
420 const char *protocol = NULL;
422 if (!strncmpic(req, "GET ftp://", 10))
424 response = FTP_RESPONSE;
429 response = GOPHER_RESPONSE;
432 log_error(LOG_LEVEL_ERROR,
433 "%s tried to use Privoxy as %s proxy: %s",
434 csp->ip_addr_str, protocol, req);
435 log_error(LOG_LEVEL_CLF,
436 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
438 write_socket(csp->cfd, response, strlen(response));
447 /*********************************************************************
449 * Function : get_request_destination_elsewhere
451 * Description : If the client's request was redirected into
452 * Privoxy without the client's knowledge,
453 * the request line lacks the destination host.
455 * This function tries to get it elsewhere,
456 * provided accept-intercepted-requests is enabled.
458 * "Elsewhere" currently only means "Host: header",
459 * but in the future we may ask the redirecting
460 * packet filter to look the destination up.
462 * If the destination stays unknown, an error
463 * response is send to the client and headers
464 * are freed so that chat() can return directly.
467 * 1 : csp = Current client state (buffers, headers, etc...)
468 * 2 : headers = a header list
470 * Returns : JB_ERR_OK if the destination is now known, or
471 * JB_ERR_PARSE if it isn't.
473 *********************************************************************/
474 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
478 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
480 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
481 " Privoxy isn't configured to accept intercepted requests.",
482 csp->ip_addr_str, csp->http->cmd);
483 /* XXX: Use correct size */
484 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
485 csp->ip_addr_str, csp->http->cmd);
487 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
488 destroy_list(headers);
492 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
494 #ifndef FEATURE_EXTENDED_HOST_PATTERNS
495 /* Split the domain we just got for pattern matching */
496 init_domain_components(csp->http);
503 /* We can't work without destination. Go spread the news.*/
505 req = list_to_text(headers);
507 /* XXX: Use correct size */
508 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
509 csp->ip_addr_str, csp->http->cmd);
510 log_error(LOG_LEVEL_ERROR,
511 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
512 csp->ip_addr_str, csp->http->cmd, req);
515 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
516 destroy_list(headers);
521 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
522 * to get the destination IP address, use it as host directly
523 * or do a reverse DNS lookup first.
528 /*********************************************************************
530 * Function : get_server_headers
532 * Description : Parses server headers in iob and fills them
533 * into csp->headers so that they can later be
537 * 1 : csp = Current client state (buffers, headers, etc...)
539 * Returns : JB_ERR_OK if everything went fine, or
540 * JB_ERR_PARSE if the headers were incomplete.
542 *********************************************************************/
543 static jb_err get_server_headers(struct client_state *csp)
545 int continue_hack_in_da_house = 0;
548 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
553 * continue hack in da house. Ignore the ending of
554 * this head and continue enlisting header lines.
555 * The reason is described below.
557 enlist(csp->headers, "");
558 continue_hack_in_da_house = 0;
561 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
564 * It's a bodyless continue response, don't
565 * stop header parsing after reaching its end.
567 * As a result Privoxy will concatenate the
568 * next response's head and parse and deliver
569 * the headers as if they belonged to one request.
571 * The client will separate them because of the
572 * empty line between them.
574 * XXX: What we're doing here is clearly against
575 * the intended purpose of the continue header,
576 * and under some conditions (HTTP/1.0 client request)
577 * it's a standard violation.
579 * Anyway, "sort of against the spec" is preferable
580 * to "always getting confused by Continue responses"
581 * (Privoxy's behaviour before this hack was added)
583 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
584 continue_hack_in_da_house = 1;
586 else if (*header == '\0')
589 * If the header is empty, but the Continue hack
590 * isn't active, we can assume that we reached the
591 * end of the buffer before we hit the end of the
594 * Inform the caller an let it decide how to handle it.
599 if (JB_ERR_MEMORY == enlist(csp->headers, header))
602 * XXX: Should we quit the request and return a
603 * out of memory error page instead?
605 log_error(LOG_LEVEL_ERROR,
606 "Out of memory while enlisting server headers. %s lost.",
616 /*********************************************************************
618 * Function : crunch_reason
620 * Description : Translates the crunch reason code into a string.
623 * 1 : rsp = a http_response
625 * Returns : A string with the crunch reason or an error description.
627 *********************************************************************/
628 static const char *crunch_reason(const struct http_response *rsp)
630 char * reason = NULL;
635 return "Internal error while searching for crunch reason";
640 case RSP_REASON_UNSUPPORTED:
641 reason = "Unsupported HTTP feature";
643 case RSP_REASON_BLOCKED:
646 case RSP_REASON_UNTRUSTED:
647 reason = "Untrusted";
649 case RSP_REASON_REDIRECTED:
650 reason = "Redirected";
652 case RSP_REASON_CGI_CALL:
655 case RSP_REASON_NO_SUCH_DOMAIN:
656 reason = "DNS failure";
658 case RSP_REASON_FORWARDING_FAILED:
659 reason = "Forwarding failed";
661 case RSP_REASON_CONNECT_FAILED:
662 reason = "Connection failure";
664 case RSP_REASON_OUT_OF_MEMORY:
665 reason = "Out of memory (may mask other reasons)";
668 reason = "No reason recorded";
676 /*********************************************************************
678 * Function : send_crunch_response
680 * Description : Delivers already prepared response for
681 * intercepted requests, logs the interception
682 * and frees the response.
685 * 1 : csp = Current client state (buffers, headers, etc...)
686 * 1 : rsp = Fully prepared response. Will be freed on exit.
690 *********************************************************************/
691 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
693 const struct http_request *http = csp->http;
697 assert(rsp->head != NULL);
702 * Not supposed to happen. If it does
703 * anyway, treat it as an unknown error.
705 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
706 /* return code doesn't matter */
711 /* If rsp is still NULL, we have serious internal problems. */
712 log_error(LOG_LEVEL_FATAL,
713 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
717 * Extract the status code from the actual head
718 * that was send to the client. It is the only
719 * way to get it right for all requests, including
720 * the fixed ones for out-of-memory problems.
722 * A head starts like this: 'HTTP/1.1 200...'
726 status_code[0] = rsp->head[9];
727 status_code[1] = rsp->head[10];
728 status_code[2] = rsp->head[11];
729 status_code[3] = '\0';
731 /* Write the answer to the client */
732 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
733 || write_socket(csp->cfd, rsp->body, rsp->content_length))
735 /* There is nothing we can do about it. */
736 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
739 /* Log that the request was crunched and why. */
740 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
741 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
742 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
744 /* Clean up and return */
745 if (cgi_error_memory() != rsp)
747 free_http_response(rsp);
754 /*********************************************************************
756 * Function : request_contains_null_bytes
758 * Description : Checks for NULL bytes in the request and sends
759 * an error message to the client if any were found.
761 * XXX: currently not used, see comment in chat().
764 * 1 : csp = Current client state (buffers, headers, etc...)
765 * 2 : buf = Data from the client's request to check.
766 * 3 : len = The data length.
768 * Returns : TRUE if the request contained one or more NULL bytes, or
771 *********************************************************************/
772 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
774 size_t c_len; /* Request lenght when treated as C string */
781 * Null byte(s) found. Log the request,
782 * return an error response and hang up.
784 size_t tmp_len = c_len;
789 * Replace NULL byte(s) with '°' characters
790 * so the request can be logged as string.
791 * XXX: Is there a better replacement character?
794 tmp_len += strlen(buf+tmp_len);
795 } while (tmp_len < len);
797 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
798 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
799 log_error(LOG_LEVEL_HEADER,
800 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
802 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
804 /* XXX: Log correct size */
805 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
815 /*********************************************************************
817 * Function : crunch_response_triggered
819 * Description : Checks if the request has to be crunched,
820 * and delivers the crunch response if necessary.
823 * 1 : csp = Current client state (buffers, headers, etc...)
824 * 2 : crunchers = list of cruncher functions to run
826 * Returns : TRUE if the request was answered with a crunch response
829 *********************************************************************/
830 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
832 struct http_response *rsp = NULL;
833 const struct cruncher *c;
836 * If CGI request crunching is disabled,
837 * check the CGI dispatcher out of order to
838 * prevent unintentional blocks or redirects.
840 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
841 && (NULL != (rsp = dispatch_cgi(csp))))
843 /* Deliver, log and free the interception response. */
844 send_crunch_response(csp, rsp);
848 for (c = crunchers; c->cruncher != NULL; c++)
851 * Check the cruncher if either Privoxy is toggled
852 * on and the request isn't forced, or if the cruncher
853 * applies to forced requests as well.
855 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
856 !(csp->flags & CSP_FLAG_FORCED)) ||
857 (c->flags & CF_IGNORE_FORCE))
859 rsp = c->cruncher(csp);
862 /* Deliver, log and free the interception response. */
863 send_crunch_response(csp, rsp);
864 #ifdef FEATURE_STATISTICS
865 if (c->flags & CF_COUNT_AS_REJECT)
867 csp->flags |= CSP_FLAG_REJECTED;
869 #endif /* def FEATURE_STATISTICS */
880 /*********************************************************************
882 * Function : build_request_line
884 * Description : Builds the HTTP request line.
886 * If a HTTP forwarder is used it expects the whole URL,
887 * web servers only get the path.
890 * 1 : csp = Current client state (buffers, headers, etc...)
891 * 2 : fwd = The forwarding spec used for the request
892 * XXX: Should use http->fwd instead.
893 * 3 : request_line = The old request line which will be replaced.
895 * Returns : Nothing. Terminates in case of memory problems.
897 *********************************************************************/
898 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
900 struct http_request *http = csp->http;
902 assert(http->ssl == 0);
905 * Downgrade http version from 1.1 to 1.0
906 * if +downgrade action applies.
908 if ( (csp->action->flags & ACTION_DOWNGRADE)
909 && (!strcmpic(http->ver, "HTTP/1.1")))
912 http->ver = strdup("HTTP/1.0");
914 if (http->ver == NULL)
916 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
921 * Rebuild the request line.
923 freez(*request_line);
924 *request_line = strdup(http->gpc);
925 string_append(request_line, " ");
927 if (fwd->forward_host)
929 string_append(request_line, http->url);
933 string_append(request_line, http->path);
935 string_append(request_line, " ");
936 string_append(request_line, http->ver);
938 if (*request_line == NULL)
940 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
942 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
946 /*********************************************************************
948 * Function : change_request_destination
950 * Description : Parse a (rewritten) request line and regenerate
951 * the http request data.
954 * 1 : csp = Current client state (buffers, headers, etc...)
956 * Returns : Forwards the parse_http_request() return code.
957 * Terminates in case of memory problems.
959 *********************************************************************/
960 static jb_err change_request_destination(struct client_state *csp)
962 struct http_request *http = csp->http;
965 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
966 free_http_request(http);
967 err = parse_http_request(csp->headers->first->str, http);
968 if (JB_ERR_OK != err)
970 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
971 jb_err_to_string(err));
975 /* XXX: ocmd is a misleading name */
976 http->ocmd = strdup(http->cmd);
977 if (http->ocmd == NULL)
979 log_error(LOG_LEVEL_FATAL,
980 "Out of memory copying rewritten HTTP request line");
988 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
989 /*********************************************************************
991 * Function : server_response_is_complete
993 * Description : Determines whether we should stop reading
994 * from the server socket.
997 * 1 : csp = Current client state (buffers, headers, etc...)
998 * 2 : content_length = Length of content received so far.
1000 * Returns : TRUE if the response is complete,
1003 *********************************************************************/
1004 static int server_response_is_complete(struct client_state *csp,
1005 unsigned long long content_length)
1007 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1009 if (!strcmpic(csp->http->gpc, "HEAD"))
1012 * "HEAD" implies no body, we are thus expecting
1013 * no content. XXX: incomplete "list" of methods?
1015 csp->expected_content_length = 0;
1016 content_length_known = TRUE;
1019 if (csp->http->status == 304)
1022 * Expect no body. XXX: incomplete "list" of status codes?
1024 csp->expected_content_length = 0;
1025 content_length_known = TRUE;
1028 return (content_length_known && ((0 == csp->expected_content_length)
1029 || (csp->expected_content_length <= content_length)));
1033 /*********************************************************************
1035 * Function : wait_for_alive_connections
1037 * Description : Waits for alive connections to timeout.
1043 *********************************************************************/
1044 static void wait_for_alive_connections(void)
1046 int connections_alive = close_unusable_connections();
1048 while (0 < connections_alive)
1050 log_error(LOG_LEVEL_CONNECT,
1051 "Waiting for %d connections to timeout.",
1054 connections_alive = close_unusable_connections();
1057 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1062 /*********************************************************************
1064 * Function : save_connection_destination
1066 * Description : Remembers a connection for reuse later on.
1069 * 1 : sfd = Open socket to remember.
1070 * 2 : http = The destination for the connection.
1071 * 3 : fwd = The forwarder settings used.
1072 * 3 : server_connection = storage.
1076 *********************************************************************/
1077 void save_connection_destination(jb_socket sfd,
1078 const struct http_request *http,
1079 const struct forward_spec *fwd,
1080 struct reusable_connection *server_connection)
1082 assert(sfd != JB_INVALID_SOCKET);
1083 assert(NULL != http->host);
1084 server_connection->host = strdup(http->host);
1085 if (NULL == server_connection->host)
1087 log_error(LOG_LEVEL_FATAL, "Out of memory saving socket.");
1089 server_connection->port = http->port;
1091 assert(NULL != fwd);
1092 assert(server_connection->gateway_host == NULL);
1093 assert(server_connection->gateway_port == 0);
1094 assert(server_connection->forwarder_type == 0);
1095 assert(server_connection->forward_host == NULL);
1096 assert(server_connection->forward_port == 0);
1098 server_connection->forwarder_type = fwd->type;
1099 if (NULL != fwd->gateway_host)
1101 server_connection->gateway_host = strdup(fwd->gateway_host);
1102 if (NULL == server_connection->gateway_host)
1104 log_error(LOG_LEVEL_FATAL, "Out of memory saving gateway_host.");
1109 server_connection->gateway_host = NULL;
1111 server_connection->gateway_port = fwd->gateway_port;
1113 if (NULL != fwd->forward_host)
1115 server_connection->forward_host = strdup(fwd->forward_host);
1116 if (NULL == server_connection->forward_host)
1118 log_error(LOG_LEVEL_FATAL, "Out of memory saving forward_host.");
1123 server_connection->forward_host = NULL;
1125 server_connection->forward_port = fwd->forward_port;
1127 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1130 /*********************************************************************
1132 * Function : mark_server_socket_tainted
1134 * Description : Makes sure we don't reuse a server socket
1135 * (if we didn't read everything the server sent
1136 * us reusing the socket would lead to garbage).
1139 * 1 : csp = Current client state (buffers, headers, etc...)
1143 *********************************************************************/
1144 static void mark_server_socket_tainted(struct client_state *csp)
1146 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
1148 log_error(LOG_LEVEL_CONNECT, "Unsetting keep-alive flag.");
1149 csp->flags &= ~CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE;
1153 /*********************************************************************
1155 * Function : get_request_line
1157 * Description : Read the client request line.
1160 * 1 : csp = Current client state (buffers, headers, etc...)
1162 * Returns : Pointer to request line or NULL in case of errors.
1164 *********************************************************************/
1165 static char *get_request_line(struct client_state *csp)
1167 char buf[BUFFER_SIZE];
1168 char *request_line = NULL;
1171 memset(buf, 0, sizeof(buf));
1175 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1177 log_error(LOG_LEVEL_ERROR,
1178 "Stopped waiting for the request line.");
1179 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
1180 strlen(CONNECTION_TIMEOUT_RESPONSE));
1184 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1186 if (len <= 0) return NULL;
1189 * If there is no memory left for buffering the
1190 * request, there is nothing we can do but hang up
1192 if (add_to_iob(csp, buf, len))
1197 request_line = get_header(csp->iob);
1199 } while ((NULL != request_line) && ('\0' == *request_line));
1201 return request_line;
1206 /*********************************************************************
1208 * Function : receive_client_request
1210 * Description : Read the client's request (more precisely the
1211 * client headers) and answer it if necessary.
1213 * Note that since we're not using select() we could get
1214 * blocked here if a client connected, then didn't say
1218 * 1 : csp = Current client state (buffers, headers, etc...)
1220 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1222 *********************************************************************/
1223 static jb_err receive_client_request(struct client_state *csp)
1225 char buf[BUFFER_SIZE];
1228 struct http_request *http;
1232 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1233 struct list header_list;
1234 struct list *headers = &header_list;
1238 memset(buf, 0, sizeof(buf));
1240 req = get_request_line(csp);
1243 return JB_ERR_PARSE;
1245 assert(*req != '\0');
1247 if (client_protocol_is_unsupported(csp, req))
1249 return JB_ERR_PARSE;
1252 #ifdef FEATURE_FORCE_LOAD
1254 * If this request contains the FORCE_PREFIX and blocks
1255 * aren't enforced, get rid of it and set the force flag.
1257 if (strstr(req, FORCE_PREFIX))
1259 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1261 log_error(LOG_LEVEL_FORCE,
1262 "Ignored force prefix in request: \"%s\".", req);
1266 strclean(req, FORCE_PREFIX);
1267 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1268 csp->flags |= CSP_FLAG_FORCED;
1271 #endif /* def FEATURE_FORCE_LOAD */
1273 err = parse_http_request(req, http);
1275 if (JB_ERR_OK != err)
1277 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1278 /* XXX: Use correct size */
1279 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1280 log_error(LOG_LEVEL_ERROR,
1281 "Couldn't parse request line received from %s: %s",
1282 csp->ip_addr_str, jb_err_to_string(err));
1284 free_http_request(http);
1285 return JB_ERR_PARSE;
1288 /* grab the rest of the client's headers */
1292 p = get_header(csp->iob);
1296 /* There are no additional headers to read. */
1303 * We didn't receive a complete header
1304 * line yet, get the rest of it.
1306 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1308 log_error(LOG_LEVEL_ERROR,
1309 "Stopped grabbing the client headers.");
1310 destroy_list(headers);
1311 return JB_ERR_PARSE;
1314 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1317 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1318 destroy_list(headers);
1319 return JB_ERR_PARSE;
1322 if (add_to_iob(csp, buf, len))
1325 * If there is no memory left for buffering the
1326 * request, there is nothing we can do but hang up
1328 destroy_list(headers);
1329 return JB_ERR_MEMORY;
1335 * We were able to read a complete
1336 * header and can finaly enlist it.
1343 if (http->host == NULL)
1346 * If we still don't know the request destination,
1347 * the request is invalid or the client uses
1348 * Privoxy without its knowledge.
1350 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1353 * Our attempts to get the request destination
1354 * elsewhere failed or Privoxy is configured
1355 * to only accept proxy requests.
1357 * An error response has already been send
1358 * and we're done here.
1360 return JB_ERR_PARSE;
1365 * Determine the actions for this URL
1367 #ifdef FEATURE_TOGGLE
1368 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1370 /* Most compatible set of actions (i.e. none) */
1371 init_current_action(csp->action);
1374 #endif /* ndef FEATURE_TOGGLE */
1376 get_url_actions(csp, http);
1380 * Save a copy of the original request for logging
1382 http->ocmd = strdup(http->cmd);
1383 if (http->ocmd == NULL)
1385 log_error(LOG_LEVEL_FATAL,
1386 "Out of memory copying HTTP request line");
1388 enlist(csp->headers, http->cmd);
1390 /* Append the previously read headers */
1391 list_append_list_unique(csp->headers, headers);
1392 destroy_list(headers);
1399 /*********************************************************************
1401 * Function : parse_client_request
1403 * Description : Parses the client's request and decides what to do
1406 * Note that since we're not using select() we could get
1407 * blocked here if a client connected, then didn't say
1411 * 1 : csp = Current client state (buffers, headers, etc...)
1413 * Returns : JB_ERR_OK or JB_ERR_PARSE
1415 *********************************************************************/
1416 static jb_err parse_client_request(struct client_state *csp)
1418 struct http_request *http = csp->http;
1421 err = sed(csp, FILTER_CLIENT_HEADERS);
1422 if (JB_ERR_OK != err)
1424 /* XXX: Should be handled in sed(). */
1425 assert(err == JB_ERR_PARSE);
1426 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
1428 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1430 /* Check request line for rewrites. */
1431 if ((NULL == csp->headers->first->str)
1432 || (strcmp(http->cmd, csp->headers->first->str) &&
1433 (JB_ERR_OK != change_request_destination(csp))))
1436 * A header filter broke the request line - bail out.
1438 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
1439 /* XXX: Use correct size */
1440 log_error(LOG_LEVEL_CLF,
1441 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1442 log_error(LOG_LEVEL_ERROR,
1443 "Invalid request line after applying header filters.");
1444 free_http_request(http);
1446 return JB_ERR_PARSE;
1454 /*********************************************************************
1458 * Description : Once a connection to the client has been accepted,
1459 * this function is called (via serve()) to handle the
1460 * main business of the communication. When this
1461 * function returns, the caller must close the client
1464 * FIXME: chat is nearly thousand lines long.
1468 * 1 : csp = Current client state (buffers, headers, etc...)
1470 * Returns : Nothing.
1472 *********************************************************************/
1473 static void chat(struct client_state *csp)
1475 char buf[BUFFER_SIZE];
1482 int ms_iis5_hack = 0;
1483 unsigned long long byte_count = 0;
1484 int forwarded_connect_retries = 0;
1485 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1486 const struct forward_spec *fwd;
1487 struct http_request *http;
1488 long len = 0; /* for buffer sizes (and negative error codes) */
1490 /* Function that does the content filtering for the current request */
1491 filter_function_ptr content_filter = NULL;
1493 /* Skeleton for HTTP response, if we should intercept the request */
1494 struct http_response *rsp;
1495 struct timeval timeout;
1497 memset(buf, 0, sizeof(buf));
1501 if (receive_client_request(csp) != JB_ERR_OK)
1505 if (parse_client_request(csp) != JB_ERR_OK)
1510 /* decide how to route the HTTP request */
1511 fwd = forward_url(csp, http);
1514 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
1515 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1520 * build the http request to send to the server
1521 * we have to do one of the following:
1523 * create = use the original HTTP request to create a new
1524 * HTTP request that has either the path component
1525 * without the http://domainspec (w/path) or the
1526 * full orininal URL (w/url)
1527 * Note that the path and/or the HTTP version may
1528 * have been altered by now.
1530 * connect = Open a socket to the host:port of the server
1531 * and short-circuit server and client socket.
1533 * pass = Pass the request unchanged if forwarding a CONNECT
1534 * request to a parent proxy. Note that we'll be sending
1535 * the CFAIL message ourselves if connecting to the parent
1536 * fails, but we won't send a CSUCCEED message if it works,
1537 * since that would result in a double message (ours and the
1538 * parent's). After sending the request to the parent, we simply
1541 * here's the matrix:
1544 * +--------+--------+
1546 * 0 | create | connect|
1548 * Forwarding +--------+--------+
1550 * 1 | create | pass |
1552 * +--------+--------+
1556 if (http->ssl && connect_port_is_forbidden(csp))
1558 const char *acceptable_connect_ports =
1559 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
1560 assert(NULL != acceptable_connect_ports);
1561 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
1562 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
1563 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
1564 csp->action->flags |= ACTION_BLOCK;
1570 freez(csp->headers->first->str);
1571 build_request_line(csp, fwd, &csp->headers->first->str);
1575 * We have a request. Check if one of the crunchers wants it.
1577 if (crunch_response_triggered(csp, crunchers_all))
1580 * Yes. The client got the crunch response
1581 * and we are done here after cleaning up.
1583 /* XXX: why list_remove_all()? */
1584 list_remove_all(csp->headers);
1589 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
1591 if (fwd->forward_host)
1593 log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
1594 fwd->forward_host, fwd->forward_port, http->hostport);
1598 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
1601 /* here we connect to the server, gateway, or the forwarder */
1603 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1604 if ((csp->sfd != JB_INVALID_SOCKET)
1605 && socket_is_still_usable(csp->sfd)
1606 && connection_destination_matches(&csp->server_connection, http, fwd))
1608 log_error(LOG_LEVEL_CONNECT,
1609 "Reusing server socket %u. Opened for %s.",
1610 csp->sfd, csp->server_connection.host);
1614 if (csp->sfd != JB_INVALID_SOCKET)
1616 log_error(LOG_LEVEL_CONNECT,
1617 "Closing server socket %u. Opened for %s.",
1618 csp->sfd, csp->server_connection.host);
1619 close_socket(csp->sfd);
1620 mark_connection_closed(&csp->server_connection);
1622 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1624 while ((csp->sfd = forwarded_connect(fwd, http, csp))
1625 && (errno == EINVAL)
1626 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
1628 log_error(LOG_LEVEL_ERROR,
1629 "failed request #%u to connect to %s. Trying again.",
1630 forwarded_connect_retries, http->hostport);
1633 if (csp->sfd == JB_INVALID_SOCKET)
1635 if (fwd->type != SOCKS_NONE)
1638 rsp = error_response(csp, "forwarding-failed");
1640 else if (errno == EINVAL)
1642 rsp = error_response(csp, "no-such-domain");
1646 rsp = error_response(csp, "connect-failed");
1647 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
1651 /* Write the answer to the client */
1654 send_crunch_response(csp, rsp);
1659 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1660 save_connection_destination(csp->sfd, http, fwd, &csp->server_connection);
1661 csp->server_connection.keep_alive_timeout = (unsigned)csp->config->keep_alive_timeout;
1663 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1665 hdr = list_to_text(csp->headers);
1668 /* FIXME Should handle error properly */
1669 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
1671 list_remove_all(csp->headers);
1673 if (fwd->forward_host || (http->ssl == 0))
1676 * Write the client's (modified) header to the server
1677 * (along with anything else that may be in the buffer)
1679 if (write_socket(csp->sfd, hdr, strlen(hdr))
1680 || (flush_socket(csp->sfd, csp->iob) < 0))
1682 log_error(LOG_LEVEL_CONNECT,
1683 "write header to: %s failed: %E", http->hostport);
1685 rsp = error_response(csp, "connect-failed");
1688 send_crunch_response(csp, rsp);
1698 * We're running an SSL tunnel and we're not forwarding,
1699 * so just send the "connect succeeded" message to the
1700 * client, flush the rest, and get out of the way.
1702 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
1710 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
1712 /* we're finished with the client's header */
1715 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
1717 /* pass data between the client and server
1718 * until one or the other shuts down the connection.
1727 * FD_ZERO here seems to point to an errant macro which crashes.
1728 * So do this by hand for now...
1730 memset(&rfds,0x00,sizeof(fd_set));
1734 FD_SET(csp->cfd, &rfds);
1735 FD_SET(csp->sfd, &rfds);
1737 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1738 if ((csp->flags & CSP_FLAG_CHUNKED)
1739 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
1740 && ((csp->iob->eod - csp->iob->cur) >= 5)
1741 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
1743 log_error(LOG_LEVEL_CONNECT,
1744 "Looks like we read the last chunk together with "
1745 "the server headers. We better stop reading.");
1746 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
1747 csp->expected_content_length = byte_count;
1748 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
1750 if (server_body && server_response_is_complete(csp, byte_count))
1752 log_error(LOG_LEVEL_CONNECT,
1753 "Done reading from server. Expected content length: %llu. "
1754 "Actual content length: %llu. Most recently received: %d.",
1755 csp->expected_content_length, byte_count, len);
1758 * XXX: should not jump around,
1759 * chat() is complicated enough already.
1763 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1765 timeout.tv_sec = csp->config->socket_timeout;
1766 timeout.tv_usec = 0;
1767 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
1771 log_error(LOG_LEVEL_ERROR,
1772 "Didn't receive data in time: %s", http->url);
1773 if ((byte_count == 0) && (http->ssl == 0))
1775 write_socket(csp->cfd, CONNECTION_TIMEOUT_RESPONSE,
1776 strlen(CONNECTION_TIMEOUT_RESPONSE));
1778 mark_server_socket_tainted(csp);
1783 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
1784 mark_server_socket_tainted(csp);
1789 * This is the body of the browser's request,
1790 * just read and write it.
1792 * XXX: Make sure the client doesn't use pipelining
1793 * behind Privoxy's back.
1795 if (FD_ISSET(csp->cfd, &rfds))
1797 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1801 /* XXX: not sure if this is necessary. */
1802 mark_server_socket_tainted(csp);
1803 break; /* "game over, man" */
1806 if (write_socket(csp->sfd, buf, (size_t)len))
1808 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
1809 mark_server_socket_tainted(csp);
1816 * The server wants to talk. It could be the header or the body.
1817 * If `hdr' is null, then it's the header otherwise it's the body.
1818 * FIXME: Does `hdr' really mean `host'? No.
1820 if (FD_ISSET(csp->sfd, &rfds))
1823 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
1827 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
1829 if (http->ssl && (fwd->forward_host == NULL))
1832 * Just hang up. We already confirmed the client's CONNECT
1833 * request with status code 200 and unencrypted content is
1834 * no longer welcome.
1836 log_error(LOG_LEVEL_ERROR,
1837 "CONNECT already confirmed. Unable to tell the client about the problem.");
1840 else if (byte_count)
1843 * Just hang up. We already transmitted the original headers
1844 * and parts of the original content and therefore missed the
1845 * chance to send an error message (without risking data corruption).
1847 * XXX: we could retry with a fancy range request here.
1849 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
1850 "Unable to tell the client about the problem.");
1851 mark_server_socket_tainted(csp);
1855 * XXX: Consider handling the cases above the same.
1857 mark_server_socket_tainted(csp);
1861 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1862 if (csp->flags & CSP_FLAG_CHUNKED)
1864 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
1866 /* XXX: this is a temporary hack */
1867 log_error(LOG_LEVEL_CONNECT,
1868 "Looks like we reached the end of the last chunk. "
1869 "We better stop reading.");
1870 csp->expected_content_length = byte_count + (unsigned long long)len;
1871 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
1875 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1878 * Add a trailing zero to let be able to use string operations.
1879 * XXX: do we still need this with filter_popups gone?
1884 * Normally, this would indicate that we've read
1885 * as much as the server has sent us and we can
1886 * close the client connection. However, Microsoft
1887 * in its wisdom has released IIS/5 with a bug that
1888 * prevents it from sending the trailing \r\n in
1889 * a 302 redirect header (and possibly other headers).
1890 * To work around this if we've haven't parsed
1891 * a full header we'll append a trailing \r\n
1892 * and see if this now generates a valid one.
1894 * This hack shouldn't have any impacts. If we've
1895 * already transmitted the header or if this is a
1896 * SSL connection, then we won't bother with this
1897 * hack. So we only work on partially received
1898 * headers. If we append a \r\n and this still
1899 * doesn't generate a valid header, then we won't
1900 * transmit anything to the client.
1905 if (server_body || http->ssl)
1908 * If we have been buffering up the document,
1909 * now is the time to apply content modification
1910 * and send the result to the client.
1914 p = execute_content_filter(csp, content_filter);
1916 * If the content filter fails, use the original
1917 * buffer and length.
1918 * (see p != NULL ? p : csp->iob->cur below)
1922 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
1925 if (JB_ERR_OK != update_server_headers(csp))
1927 log_error(LOG_LEVEL_FATAL,
1928 "Failed to update server headers. after filtering.");
1931 hdr = list_to_text(csp->headers);
1934 /* FIXME Should handle error properly */
1935 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
1938 if (write_socket(csp->cfd, hdr, strlen(hdr))
1939 || write_socket(csp->cfd,
1940 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
1942 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
1945 mark_server_socket_tainted(csp);
1953 break; /* "game over, man" */
1957 * This is NOT the body, so
1958 * Let's pretend the server just sent us a blank line.
1960 snprintf(buf, sizeof(buf), "\r\n");
1961 len = (int)strlen(buf);
1964 * Now, let the normal header parsing algorithm below do its
1965 * job. If it fails, we'll exit instead of continuing.
1972 * If this is an SSL connection or we're in the body
1973 * of the server document, just write it to the client,
1974 * unless we need to buffer the body for later content-filtering
1976 if (server_body || http->ssl)
1981 * If there is no memory left for buffering the content, or the buffer limit
1982 * has been reached, switch to non-filtering mode, i.e. make & write the
1983 * header, flush the iob and buf, and get out of the way.
1985 if (add_to_iob(csp, buf, len))
1990 log_error(LOG_LEVEL_INFO,
1991 "Flushing header and buffers. Stepping back from filtering.");
1993 hdr = list_to_text(csp->headers);
1997 * Memory is too tight to even generate the header.
1998 * Send our static "Out-of-memory" page.
2000 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2001 rsp = cgi_error_memory();
2002 send_crunch_response(csp, rsp);
2003 mark_server_socket_tainted(csp);
2006 hdrlen = strlen(hdr);
2008 if (write_socket(csp->cfd, hdr, hdrlen)
2009 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
2010 || (write_socket(csp->cfd, buf, (size_t)len)))
2012 log_error(LOG_LEVEL_CONNECT,
2013 "Flush header and buffers to client failed: %E");
2015 mark_server_socket_tainted(csp);
2020 * Reset the byte_count to the amount of bytes
2021 * we just flushed. len will be added a few lines below,
2022 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2024 byte_count = (unsigned long long)flushed;
2026 content_filter = NULL;
2032 if (write_socket(csp->cfd, buf, (size_t)len))
2034 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2035 mark_server_socket_tainted(csp);
2039 byte_count += (unsigned long long)len;
2044 const char *header_start;
2046 * We're still looking for the end of the server's header.
2047 * Buffer up the data we just read. If that fails, there's
2048 * little we can do but send our static out-of-memory page.
2050 if (add_to_iob(csp, buf, len))
2052 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2053 rsp = cgi_error_memory();
2054 send_crunch_response(csp, rsp);
2055 mark_server_socket_tainted(csp);
2059 header_start = csp->iob->cur;
2061 /* Convert iob into something sed() can digest */
2062 if (JB_ERR_PARSE == get_server_headers(csp))
2067 * Well, we tried our MS IIS/5 hack and it didn't work.
2068 * The header is incomplete and there isn't anything
2069 * we can do about it.
2071 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
2072 "Applying the MS IIS5 hack didn't help.");
2073 log_error(LOG_LEVEL_CLF,
2074 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2075 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2076 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2077 mark_server_socket_tainted(csp);
2083 * Since we have to wait for more from the server before
2084 * we can parse the headers we just continue here.
2086 long header_offset = csp->iob->cur - header_start;
2087 assert(csp->iob->cur >= header_start);
2088 byte_count += (unsigned long long)(len - header_offset);
2089 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
2090 "byte_count: %llu. header_offset: %d. len: %d.",
2091 byte_count, header_offset, len);
2096 /* Did we actually get anything? */
2097 if (NULL == csp->headers->first)
2099 log_error(LOG_LEVEL_ERROR, "Empty server or forwarder response.");
2100 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2101 write_socket(csp->cfd, NO_SERVER_DATA_RESPONSE, strlen(NO_SERVER_DATA_RESPONSE));
2102 free_http_request(http);
2103 mark_server_socket_tainted(csp);
2107 assert(csp->headers->first->str);
2109 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
2110 strncmpic(csp->headers->first->str, "ICY", 3))
2113 * It doesn't look like a HTTP (or Shoutcast) response:
2114 * tell the client and log the problem.
2116 if (strlen(csp->headers->first->str) > 30)
2118 csp->headers->first->str[30] = '\0';
2120 log_error(LOG_LEVEL_ERROR,
2121 "Invalid server or forwarder response. Starts with: %s",
2122 csp->headers->first->str);
2123 log_error(LOG_LEVEL_CLF,
2124 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2125 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2126 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2127 free_http_request(http);
2128 mark_server_socket_tainted(csp);
2133 * We have now received the entire server header,
2134 * filter it and send the result to the client
2136 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
2138 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2140 hdr = list_to_text(csp->headers);
2143 /* FIXME Should handle error properly */
2144 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2147 if (crunch_response_triggered(csp, crunchers_light))
2150 * One of the tags created by a server-header
2151 * tagger triggered a crunch. We already
2152 * delivered the crunch response to the client
2153 * and are done here after cleaning up.
2156 mark_server_socket_tainted(csp);
2159 /* Buffer and pcrs filter this if appropriate. */
2161 if (!http->ssl) /* We talk plaintext */
2163 content_filter = get_filter_function(csp);
2166 * Only write if we're not buffering for content modification
2168 if (!content_filter)
2171 * Write the server's (modified) header to
2172 * the client (along with anything else that
2173 * may be in the buffer)
2176 if (write_socket(csp->cfd, hdr, strlen(hdr))
2177 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
2179 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2182 * The write failed, so don't bother mentioning it
2183 * to the client... it probably can't hear us anyway.
2186 mark_server_socket_tainted(csp);
2190 byte_count += (unsigned long long)len;
2195 * XXX: the header lenght should probably
2196 * be calculated by get_server_headers().
2198 long header_length = csp->iob->cur - header_start;
2199 assert(csp->iob->cur > header_start);
2200 byte_count += (unsigned long long)(len - header_length);
2203 /* we're finished with the server's header */
2209 * If this was a MS IIS/5 hack then it means the server
2210 * has already closed the connection. Nothing more to read.
2215 log_error(LOG_LEVEL_ERROR,
2216 "Closed server connection detected. "
2217 "Applying the MS IIS5 hack didn't help.");
2218 log_error(LOG_LEVEL_CLF,
2219 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2220 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2221 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2222 mark_server_socket_tainted(csp);
2228 mark_server_socket_tainted(csp);
2229 return; /* huh? we should never get here */
2232 if (csp->content_length == 0)
2235 * If Privoxy didn't recalculate the Content-Lenght,
2236 * byte_count is still correct.
2238 csp->content_length = byte_count;
2241 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2242 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2243 && (csp->expected_content_length != byte_count))
2245 log_error(LOG_LEVEL_CONNECT,
2246 "Received %llu bytes while expecting %llu.",
2247 byte_count, csp->expected_content_length);
2248 mark_server_socket_tainted(csp);
2252 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
2253 csp->ip_addr_str, http->ocmd, csp->content_length);
2257 /*********************************************************************
2261 * Description : This is little more than chat. We only "serve" to
2262 * to close (or remember) any socket that chat may have
2266 * 1 : csp = Current client state (buffers, headers, etc...)
2270 *********************************************************************/
2272 void serve(struct client_state *csp)
2273 #else /* ifndef AMIGA */
2274 static void serve(struct client_state *csp)
2275 #endif /* def AMIGA */
2277 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2278 static int monitor_thread_running = 0;
2279 int continue_chatting = 0;
2284 continue_chatting = (csp->config->feature_flags
2285 & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2286 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
2287 && (csp->cfd != JB_INVALID_SOCKET)
2288 && (csp->sfd != JB_INVALID_SOCKET)
2289 && socket_is_still_usable(csp->sfd);
2291 if (continue_chatting)
2293 log_error(LOG_LEVEL_CONNECT,
2294 "Waiting for the next client request. "
2295 "Keeping the server socket %d to %s open.",
2296 csp->sfd, csp->server_connection.host);
2298 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
2299 && data_is_available(csp->cfd, (int)csp->server_connection.keep_alive_timeout)
2300 && socket_is_still_usable(csp->cfd))
2302 log_error(LOG_LEVEL_CONNECT, "Client request arrived in "
2303 "time or the client closed the connection.");
2305 * Get the csp in a mostly vergin state again.
2306 * XXX: Should be done elsewhere.
2308 csp->content_type = 0;
2309 csp->content_length = 0;
2310 csp->expected_content_length = 0;
2311 list_remove_all(csp->headers);
2312 freez(csp->iob->buf);
2313 memset(csp->iob, 0, sizeof(csp->iob));
2314 freez(csp->error_message);
2315 free_http_request(csp->http);
2316 destroy_list(csp->headers);
2317 destroy_list(csp->tags);
2318 free_current_action(csp->action);
2319 if (NULL != csp->fwd)
2321 unload_forward_spec(csp->fwd);
2325 /* XXX: Store per-connection flags someplace else. */
2326 csp->flags = CSP_FLAG_ACTIVE | (csp->flags & CSP_FLAG_TOGGLED_ON);
2330 log_error(LOG_LEVEL_CONNECT,
2331 "No additional client request received in time.");
2332 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING))
2334 remember_connection(csp->sfd, csp->http,
2335 forward_url(csp, csp->http),
2336 csp->server_connection.keep_alive_timeout);
2337 csp->sfd = JB_INVALID_SOCKET;
2338 close_socket(csp->cfd);
2339 csp->cfd = JB_INVALID_SOCKET;
2340 privoxy_mutex_lock(&connection_reuse_mutex);
2341 if (!monitor_thread_running)
2343 monitor_thread_running = 1;
2344 privoxy_mutex_unlock(&connection_reuse_mutex);
2345 wait_for_alive_connections();
2346 privoxy_mutex_lock(&connection_reuse_mutex);
2347 monitor_thread_running = 0;
2349 privoxy_mutex_unlock(&connection_reuse_mutex);
2354 else if (csp->sfd != JB_INVALID_SOCKET)
2356 log_error(LOG_LEVEL_CONNECT,
2357 "The connection on server socket %d to %s isn't reusable. "
2358 "Closing.", csp->sfd, csp->server_connection.host);
2360 } while (continue_chatting);
2362 mark_connection_closed(&csp->server_connection);
2365 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2367 if (csp->sfd != JB_INVALID_SOCKET)
2369 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2370 forget_connection(csp->sfd);
2371 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2372 close_socket(csp->sfd);
2375 if (csp->cfd != JB_INVALID_SOCKET)
2377 close_socket(csp->cfd);
2380 csp->flags &= ~CSP_FLAG_ACTIVE;
2386 /*********************************************************************
2388 * Function : server_thread
2390 * Description : We only exist to call `serve' in a threaded environment.
2393 * 1 : data = Current client state (buffers, headers, etc...)
2395 * Returns : Always 0.
2397 *********************************************************************/
2398 static int32 server_thread(void *data)
2400 serve((struct client_state *) data);
2407 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2408 /*********************************************************************
2412 * Description : Print usage info & exit.
2414 * Parameters : Pointer to argv[0] for identifying ourselves
2418 *********************************************************************/
2419 static void usage(const char *myname)
2421 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2425 #endif /* defined(unix) */
2428 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2429 #endif /* defined(unix) */
2430 "[--version] [configfile]\n"
2431 "Aborting\n", myname);
2436 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2439 #ifdef MUTEX_LOCKS_AVAILABLE
2440 /*********************************************************************
2442 * Function : privoxy_mutex_lock
2444 * Description : Locks a mutex.
2447 * 1 : mutex = The mutex to lock.
2449 * Returns : Void. May exit in case of errors.
2451 *********************************************************************/
2452 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
2454 #ifdef FEATURE_PTHREAD
2455 int err = pthread_mutex_lock(mutex);
2458 if (mutex != &log_mutex)
2460 log_error(LOG_LEVEL_FATAL,
2461 "Mutex locking failed: %s.\n", strerror(err));
2466 EnterCriticalSection(mutex);
2467 #endif /* def FEATURE_PTHREAD */
2471 /*********************************************************************
2473 * Function : privoxy_mutex_unlock
2475 * Description : Unlocks a mutex.
2478 * 1 : mutex = The mutex to unlock.
2480 * Returns : Void. May exit in case of errors.
2482 *********************************************************************/
2483 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
2485 #ifdef FEATURE_PTHREAD
2486 int err = pthread_mutex_unlock(mutex);
2489 if (mutex != &log_mutex)
2491 log_error(LOG_LEVEL_FATAL,
2492 "Mutex unlocking failed: %s.\n", strerror(err));
2497 LeaveCriticalSection(mutex);
2498 #endif /* def FEATURE_PTHREAD */
2502 /*********************************************************************
2504 * Function : privoxy_mutex_init
2506 * Description : Prepares a mutex.
2509 * 1 : mutex = The mutex to initialize.
2511 * Returns : Void. May exit in case of errors.
2513 *********************************************************************/
2514 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
2516 #ifdef FEATURE_PTHREAD
2517 int err = pthread_mutex_init(mutex, 0);
2520 printf("Fatal error. Mutex initialization failed: %s.\n",
2525 InitializeCriticalSection(mutex);
2526 #endif /* def FEATURE_PTHREAD */
2528 #endif /* def MUTEX_LOCKS_AVAILABLE */
2530 /*********************************************************************
2532 * Function : initialize_mutexes
2534 * Description : Prepares mutexes if mutex support is available.
2538 * Returns : Void, exits in case of errors.
2540 *********************************************************************/
2541 static void initialize_mutexes(void)
2543 #ifdef MUTEX_LOCKS_AVAILABLE
2545 * Prepare global mutex semaphores
2547 privoxy_mutex_init(&log_mutex);
2548 privoxy_mutex_init(&log_init_mutex);
2549 privoxy_mutex_init(&connection_reuse_mutex);
2552 * XXX: The assumptions below are a bit naive
2553 * and can cause locks that aren't necessary.
2555 * For example older FreeBSD versions (< 6.x?)
2556 * have no gethostbyname_r, but gethostbyname is
2559 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2560 privoxy_mutex_init(&resolver_mutex);
2561 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2563 * XXX: should we use a single mutex for
2564 * localtime() and gmtime() as well?
2566 #ifndef HAVE_GMTIME_R
2567 privoxy_mutex_init(&gmtime_mutex);
2568 #endif /* ndef HAVE_GMTIME_R */
2570 #ifndef HAVE_LOCALTIME_R
2571 privoxy_mutex_init(&localtime_mutex);
2572 #endif /* ndef HAVE_GMTIME_R */
2575 privoxy_mutex_init(&rand_mutex);
2576 #endif /* ndef HAVE_RANDOM */
2577 #endif /* def MUTEX_LOCKS_AVAILABLE */
2581 /*********************************************************************
2585 * Description : Load the config file and start the listen loop.
2586 * This function is a lot more *sane* with the `load_config'
2587 * and `listen_loop' functions; although it stills does
2588 * a *little* too much for my taste.
2591 * 1 : argc = Number of parameters (including $0).
2592 * 2 : argv = Array of (char *)'s to the parameters.
2594 * Returns : 1 if : can't open config file, unrecognized directive,
2595 * stats requested in multi-thread mode, can't open the
2596 * log file, can't open the jar file, listen port is invalid,
2597 * any load fails, and can't bind port.
2599 * Else main never returns, the process must be signaled
2600 * to terminate execution. Or, on Windows, use the
2601 * "File", "Exit" menu option.
2603 *********************************************************************/
2605 int real_main(int argc, const char *argv[])
2607 int main(int argc, const char *argv[])
2611 unsigned int random_seed;
2613 struct passwd *pw = NULL;
2614 struct group *grp = NULL;
2617 char *pre_chroot_nslookup_to_load_resolver = NULL;
2624 #if !defined(_WIN32)
2631 /* Prepare mutexes if supported and necessary. */
2632 initialize_mutexes();
2634 /* Enable logging until further notice. */
2638 * Parse the command line arguments
2640 * XXX: simply printing usage information in case of
2641 * invalid arguments isn't particularly user friendly.
2643 while (++argc_pos < argc)
2646 /* Check to see if the service must be installed or uninstalled */
2647 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2649 const char *pName = argv[argc_pos] + 9;
2652 exit( (install_service(pName)) ? 0 : 1 );
2654 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2656 const char *pName = argv[argc_pos] + 11;
2659 exit((uninstall_service(pName)) ? 0 : 1);
2661 else if (strcmp(argv[argc_pos], "--service" ) == 0)
2663 bRunAsService = TRUE;
2664 w32_set_service_cwd();
2665 atexit(w32_service_exit_notify);
2668 #endif /* defined(_WIN32) */
2671 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2673 if (strcmp(argv[argc_pos], "--help") == 0)
2678 else if(strcmp(argv[argc_pos], "--version") == 0)
2680 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
2686 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
2688 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
2692 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
2694 if (++argc_pos == argc) usage(argv[0]);
2695 pidfile = strdup(argv[argc_pos]);
2698 else if (strcmp(argv[argc_pos], "--user" ) == 0)
2700 if (++argc_pos == argc) usage(argv[argc_pos]);
2702 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
2705 if (NULL == (grp = getgrnam(p)))
2707 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
2711 if (NULL == (pw = getpwnam(argv[argc_pos])))
2713 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
2716 if (p != NULL) *--p = '\0';
2719 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
2721 if (++argc_pos == argc) usage(argv[0]);
2722 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
2725 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
2729 #endif /* defined(unix) */
2731 else if (argc_pos + 1 != argc)
2734 * This is neither the last command line
2735 * option, nor was it recognized before,
2736 * therefore it must be invalid.
2742 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
2744 configfile = argv[argc_pos];
2747 } /* -END- while (more arguments) */
2749 show_version(Argv[0]);
2752 if ( *configfile != '/' )
2754 char cwd[BUFFER_SIZE];
2756 size_t abs_file_size;
2758 /* make config-filename absolute here */
2759 if (NULL == getcwd(cwd, sizeof(cwd)))
2761 perror("failed to get current working directory");
2766 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
2767 basedir = strdup(cwd);
2769 if (NULL == basedir ||
2770 NULL == (abs_file = malloc(abs_file_size)))
2772 perror("malloc failed");
2775 strlcpy(abs_file, basedir, abs_file_size);
2776 strlcat(abs_file, "/", abs_file_size );
2777 strlcat(abs_file, configfile, abs_file_size);
2778 configfile = abs_file;
2780 #endif /* defined unix */
2784 clients->next = NULL;
2786 /* XXX: factor out initialising after the next stable release. */
2789 #elif defined(_WIN32)
2793 random_seed = (unsigned int)time(NULL);
2795 srandom(random_seed);
2798 #endif /* ifdef HAVE_RANDOM */
2801 * Unix signal handling
2803 * Catch the abort, interrupt and terminate signals for a graceful exit
2804 * Catch the hangup signal so the errlog can be reopened.
2805 * Ignore the broken pipe signals (FIXME: Why?)
2807 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
2810 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
2811 const int ignored_signals[] = { SIGPIPE, 0 };
2813 for (idx = 0; catched_signals[idx] != 0; idx++)
2815 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
2816 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
2818 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
2819 #endif /* ifdef sun */
2821 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
2825 for (idx = 0; ignored_signals[idx] != 0; idx++)
2827 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
2829 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
2834 #else /* ifdef _WIN32 */
2835 # ifdef _WIN_CONSOLE
2837 * We *are* in a windows console app.
2838 * Print a verbose messages about FAQ's and such
2840 printf("%s", win32_blurb);
2841 # endif /* def _WIN_CONSOLE */
2842 #endif /* def _WIN32 */
2845 /* Initialize the CGI subsystem */
2846 cgi_init_error_messages();
2849 * If runnig on unix and without the --nodaemon
2850 * option, become a daemon. I.e. fork, detach
2851 * from tty and get process group leadership
2864 if ( pid < 0 ) /* error */
2869 else if ( pid != 0 ) /* parent */
2874 * must check for errors
2875 * child died due to missing files aso
2878 wpid = waitpid( pid, &status, WNOHANG );
2887 /* Should be more portable, but not as well tested */
2892 #else /* ndef __FreeBSD__ */
2894 #endif /* ndef __FreeBSD__ */
2895 fd = open("/dev/tty", O_RDONLY);
2898 /* no error check here */
2899 ioctl( fd, TIOCNOTTY,0 );
2904 * stderr (fd 2) will be closed later on,
2905 * when the config file has been parsed.
2912 } /* -END- if (!no_daemon) */
2915 * As soon as we have written the PID file, we can switch
2916 * to the user and group ID indicated by the --user option
2922 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
2924 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
2928 if (setgroups(1, &grp->gr_gid))
2930 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
2933 else if (initgroups(pw->pw_name, pw->pw_gid))
2935 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
2941 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
2943 /* Read the time zone file from /etc before doing chroot. */
2945 if (NULL != pre_chroot_nslookup_to_load_resolver
2946 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
2948 /* Initialize resolver library. */
2949 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
2951 if (chroot(pw->pw_dir) < 0)
2953 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
2957 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
2960 if (setuid(pw->pw_uid))
2962 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
2966 char putenv_dummy[64];
2968 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
2969 if (putenv(putenv_dummy) != 0)
2971 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
2974 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
2975 if (putenv(putenv_dummy) != 0)
2977 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
2983 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
2986 #endif /* defined unix */
2989 /* This will be FALSE unless the command line specified --service
2993 /* Yup, so now we must attempt to establish a connection
2994 * with the service dispatcher. This will only work if this
2995 * process was launched by the service control manager to
2996 * actually run as a service. If this isn't the case, i've
2997 * known it take around 30 seconds or so for the call to return.
3000 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3001 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3003 /* Service has run, and at this point is now being stopped, so just return */
3008 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3010 /* An error occurred. Usually it's because --service was wrongly specified
3011 * and we were unable to connect to the Service Control Dispatcher because
3012 * it wasn't expecting us and is therefore not listening.
3014 * For now, just continue below to call the listen_loop function.
3017 #endif /* def _WIN32 */
3027 /*********************************************************************
3029 * Function : bind_port_helper
3031 * Description : Bind the listen port. Handles logging, and aborts
3035 * 1 : config = Privoxy configuration. Specifies port
3038 * Returns : Port that was opened.
3040 *********************************************************************/
3041 static jb_socket bind_port_helper(struct configuration_spec * config)
3046 if (config->haddr == NULL)
3048 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3053 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3054 config->hport, config->haddr);
3057 result = bind_port(config->haddr, config->hport, &bfd);
3064 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3065 "There may be another Privoxy or some other "
3066 "proxy running on port %d",
3067 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3068 config->hport, config->hport);
3071 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3072 "The hostname is not resolvable",
3073 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3076 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: because %E",
3077 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3080 /* shouldn't get here */
3081 return JB_INVALID_SOCKET;
3084 config->need_bind = 0;
3091 /* Without this simple workaround we get this compiler warning from _beginthread
3092 * warning C4028: formal parameter 1 different from declaration
3094 void w32_service_listen_loop(void *p)
3098 #endif /* def _WIN32 */
3101 /*********************************************************************
3103 * Function : listen_loop
3105 * Description : bind the listen port and enter a "FOREVER" listening loop.
3111 *********************************************************************/
3112 static void listen_loop(void)
3114 struct client_state *csp = NULL;
3116 struct configuration_spec *config;
3117 unsigned int active_threads = 0;
3119 config = load_config();
3121 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3123 * XXX: Should be relocated once it no
3124 * longer needs to emit log messages.
3126 initialize_reusable_connections();
3127 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3129 bfd = bind_port_helper(config);
3131 #ifdef FEATURE_GRACEFUL_TERMINATION
3132 while (!g_terminate)
3137 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3138 while (waitpid(-1, NULL, WNOHANG) > 0)
3140 /* zombie children */
3142 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3145 * Free data that was used by died threads
3147 active_threads = sweep();
3151 * Re-open the errlog after HUP signal
3153 if (received_hup_signal)
3155 if (NULL != config->logfile)
3157 init_error_log(Argv[0], config->logfile);
3159 received_hup_signal = 0;
3163 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3165 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3169 csp->flags |= CSP_FLAG_ACTIVE;
3170 csp->sfd = JB_INVALID_SOCKET;
3172 csp->config = config = load_config();
3174 if ( config->need_bind )
3177 * Since we were listening to the "old port", we will not see
3178 * a "listen" param change until the next request. So, at
3179 * least 1 more request must be made for us to find the new
3180 * setting. I am simply closing the old socket and binding the
3183 * Which-ever is correct, we will serve 1 more page via the
3184 * old settings. This should probably be a "show-proxy-args"
3185 * request. This should not be a so common of an operation
3186 * that this will hurt people's feelings.
3191 bfd = bind_port_helper(config);
3194 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3196 if (!accept_connection(csp, bfd))
3198 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3211 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3214 #ifdef FEATURE_TOGGLE
3215 if (global_toggle_state)
3216 #endif /* def FEATURE_TOGGLE */
3218 csp->flags |= CSP_FLAG_TOGGLED_ON;
3221 if (run_loader(csp))
3223 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3224 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3228 if (block_acl(NULL,csp))
3230 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3231 close_socket(csp->cfd);
3232 freez(csp->ip_addr_str);
3236 #endif /* def FEATURE_ACL */
3238 if ((0 != config->max_client_connections)
3239 && (active_threads >= config->max_client_connections))
3241 log_error(LOG_LEVEL_CONNECT,
3242 "Rejecting connection from %s. Maximum number of connections reached.",
3244 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
3245 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
3246 close_socket(csp->cfd);
3247 freez(csp->ip_addr_str);
3252 /* add it to the list of clients */
3253 csp->next = clients->next;
3254 clients->next = csp;
3256 if (config->multi_threaded)
3260 /* this is a switch () statment in the C preprocessor - ugh */
3261 #undef SELECTED_ONE_OPTION
3263 /* Use Pthreads in preference to native code */
3264 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3265 #define SELECTED_ONE_OPTION
3267 pthread_t the_thread;
3268 pthread_attr_t attrs;
3270 pthread_attr_init(&attrs);
3271 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3272 errno = pthread_create(&the_thread, &attrs,
3273 (void * (*)(void *))serve, csp);
3274 child_id = errno ? -1 : 0;
3275 pthread_attr_destroy(&attrs);
3279 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3280 #define SELECTED_ONE_OPTION
3281 child_id = _beginthread(
3282 (void (*)(void *))serve,
3287 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3288 #define SELECTED_ONE_OPTION
3289 child_id = _beginthread(
3290 (void(* _Optlink)(void*))serve,
3296 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3297 #define SELECTED_ONE_OPTION
3299 thread_id tid = spawn_thread
3300 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3302 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3304 child_id = (int) tid;
3313 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3314 #define SELECTED_ONE_OPTION
3315 csp->cfd = ReleaseSocket(csp->cfd, -1);
3318 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3319 NP_Output, Output(),
3320 NP_CloseOutput, FALSE,
3321 NP_Name, (ULONG)"privoxy child",
3325 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3326 NP_Output, Output(),
3327 NP_CloseOutput, FALSE,
3328 NP_Name, (ULONG)"privoxy child",
3329 NP_StackSize, 200*1024,
3335 ((struct Task *)child_id)->tc_UserData = csp;
3336 Signal((struct Task *)child_id, SIGF_SINGLE);
3341 #if !defined(SELECTED_ONE_OPTION)
3344 /* This block is only needed when using fork().
3345 * When using threads, the server thread was
3346 * created and run by the call to _beginthread().
3348 if (child_id == 0) /* child */
3351 #ifdef FEATURE_TOGGLE
3352 int inherited_toggle_state = global_toggle_state;
3353 #endif /* def FEATURE_TOGGLE */
3358 * If we've been toggled or we've blocked the request, tell Mom
3361 #ifdef FEATURE_TOGGLE
3362 if (inherited_toggle_state != global_toggle_state)
3364 rc |= RC_FLAG_TOGGLED;
3366 #endif /* def FEATURE_TOGGLE */
3368 #ifdef FEATURE_STATISTICS
3369 if (csp->flags & CSP_FLAG_REJECTED)
3371 rc |= RC_FLAG_BLOCKED;
3373 #endif /* ndef FEATURE_STATISTICS */
3377 else if (child_id > 0) /* parent */
3379 /* in a fork()'d environment, the parent's
3380 * copy of the client socket and the CSP
3384 #if !defined(_WIN32) && !defined(__CYGWIN__)
3386 wait( &child_status );
3389 * Evaluate child's return code: If the child has
3390 * - been toggled, toggle ourselves
3391 * - blocked its request, bump up the stats counter
3394 #ifdef FEATURE_TOGGLE
3395 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3397 global_toggle_state = !global_toggle_state;
3399 #endif /* def FEATURE_TOGGLE */
3401 #ifdef FEATURE_STATISTICS
3403 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3407 #endif /* def FEATURE_STATISTICS */
3409 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3410 close_socket(csp->cfd);
3411 csp->flags &= ~CSP_FLAG_ACTIVE;
3415 #undef SELECTED_ONE_OPTION
3416 /* end of cpp switch () */
3421 * Spawning the child failed, assume it's because
3422 * there are too many children running already.
3423 * XXX: If you assume ...
3425 log_error(LOG_LEVEL_ERROR,
3426 "Unable to take any additional connections: %E");
3427 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
3428 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
3429 close_socket(csp->cfd);
3430 csp->flags &= ~CSP_FLAG_ACTIVE;
3439 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3441 /* Clean up. Aim: free all memory (no leaks) */
3442 #ifdef FEATURE_GRACEFUL_TERMINATION
3444 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3446 unload_current_config_file();
3447 unload_current_actions_file();
3448 unload_current_re_filterfile();
3449 #ifdef FEATURE_TRUST
3450 unload_current_trust_file();
3453 if (config->multi_threaded)
3460 } while ((clients->next != NULL) && (--i > 0));
3464 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3475 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3476 /* Cleanup - remove taskbar icon etc. */
3481 #endif /* FEATURE_GRACEFUL_TERMINATION */