1 const char jcc_rcs[] = "$Id: jcc.c,v 1.278 2009/08/19 16:00:07 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 INVALID_SERVER_HEADERS_RESPONSE[] =
241 "HTTP/1.0 502 Server or forwarder response invalid\r\n"
242 "Proxy-Agent: Privoxy " VERSION "\r\n"
243 "Content-Type: text/plain\r\n"
244 "Connection: close\r\n\r\n"
245 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
248 /* XXX: should be a template */
249 static const char NULL_BYTE_RESPONSE[] =
250 "HTTP/1.0 400 Bad request received from client\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 request. Null byte(s) before end of request.\r\n";
257 /* XXX: should be a template */
258 static const char MESSED_UP_REQUEST_RESPONSE[] =
259 "HTTP/1.0 400 Malformed request after rewriting\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. Messed up with header filters.\r\n";
265 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
266 "HTTP/1.0 503 Too many open connections\r\n"
267 "Proxy-Agent: Privoxy " VERSION "\r\n"
268 "Content-Type: text/plain\r\n"
269 "Connection: close\r\n\r\n"
270 "Maximum number of open connections reached.\r\n";
272 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
273 "HTTP/1.0 504 Connection timeout\r\n"
274 "Proxy-Agent: Privoxy " VERSION "\r\n"
275 "Content-Type: text/plain\r\n"
276 "Connection: close\r\n\r\n"
277 "The connection timed out because the client request didn't arrive in time.\r\n";
279 /* A function to crunch a response */
280 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
282 /* Crunch function flags */
283 #define CF_NO_FLAGS 0
284 /* Cruncher applies to forced requests as well */
285 #define CF_IGNORE_FORCE 1
286 /* Crunched requests are counted for the block statistics */
287 #define CF_COUNT_AS_REJECT 2
289 /* A crunch function and its flags */
292 const crunch_func_ptr cruncher;
296 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
298 /* Complete list of cruncher functions */
299 static const struct cruncher crunchers_all[] = {
300 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
301 { block_url, CF_COUNT_AS_REJECT },
303 { trust_url, CF_COUNT_AS_REJECT },
304 #endif /* def FEATURE_TRUST */
305 { redirect_url, CF_NO_FLAGS },
306 { dispatch_cgi, CF_IGNORE_FORCE},
310 /* Light version, used after tags are applied */
311 static const struct cruncher crunchers_light[] = {
312 { block_url, CF_COUNT_AS_REJECT },
313 { redirect_url, CF_NO_FLAGS },
319 * XXX: Don't we really mean
325 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
326 /*********************************************************************
328 * Function : sig_handler
330 * Description : Signal handler for different signals.
331 * Exit gracefully on TERM and INT
332 * or set a flag that will cause the errlog
333 * to be reopened by the main thread on HUP.
336 * 1 : the_signal = the signal cause this function to call
340 *********************************************************************/
341 static void sig_handler(int the_signal)
347 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
359 received_hup_signal = 1;
365 * We shouldn't be here, unless we catch signals
366 * in main() that we can't handle here!
368 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
376 /*********************************************************************
378 * Function : client_protocol_is_unsupported
380 * Description : Checks if the client used a known unsupported
381 * protocol and deals with it by sending an error
385 * 1 : csp = Current client state (buffers, headers, etc...)
386 * 2 : req = the first request line send by the client
388 * Returns : TRUE if an error response has been generated, or
389 * FALSE if the request doesn't look invalid.
391 *********************************************************************/
392 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
395 * If it's a FTP or gopher request, we don't support it.
397 * These checks are better than nothing, but they might
398 * not work in all configurations and some clients might
399 * have problems digesting the answer.
401 * They should, however, never cause more problems than
402 * Privoxy's old behaviour (returning the misleading HTML
405 * "Could not resolve http://(ftp|gopher)://example.org").
407 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
409 const char *response = NULL;
410 const char *protocol = NULL;
412 if (!strncmpic(req, "GET ftp://", 10))
414 response = FTP_RESPONSE;
419 response = GOPHER_RESPONSE;
422 log_error(LOG_LEVEL_ERROR,
423 "%s tried to use Privoxy as %s proxy: %s",
424 csp->ip_addr_str, protocol, req);
425 log_error(LOG_LEVEL_CLF,
426 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
428 write_socket(csp->cfd, response, strlen(response));
437 /*********************************************************************
439 * Function : get_request_destination_elsewhere
441 * Description : If the client's request was redirected into
442 * Privoxy without the client's knowledge,
443 * the request line lacks the destination host.
445 * This function tries to get it elsewhere,
446 * provided accept-intercepted-requests is enabled.
448 * "Elsewhere" currently only means "Host: header",
449 * but in the future we may ask the redirecting
450 * packet filter to look the destination up.
452 * If the destination stays unknown, an error
453 * response is send to the client and headers
454 * are freed so that chat() can return directly.
457 * 1 : csp = Current client state (buffers, headers, etc...)
458 * 2 : headers = a header list
460 * Returns : JB_ERR_OK if the destination is now known, or
461 * JB_ERR_PARSE if it isn't.
463 *********************************************************************/
464 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
468 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
470 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
471 " Privoxy isn't configured to accept intercepted requests.",
472 csp->ip_addr_str, csp->http->cmd);
473 /* XXX: Use correct size */
474 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
475 csp->ip_addr_str, csp->http->cmd);
477 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
478 destroy_list(headers);
482 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
484 #ifndef FEATURE_EXTENDED_HOST_PATTERNS
485 /* Split the domain we just got for pattern matching */
486 init_domain_components(csp->http);
493 /* We can't work without destination. Go spread the news.*/
495 req = list_to_text(headers);
497 /* XXX: Use correct size */
498 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
499 csp->ip_addr_str, csp->http->cmd);
500 log_error(LOG_LEVEL_ERROR,
501 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
502 csp->ip_addr_str, csp->http->cmd, req);
505 write_socket(csp->cfd, MISSING_DESTINATION_RESPONSE, strlen(MISSING_DESTINATION_RESPONSE));
506 destroy_list(headers);
511 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
512 * to get the destination IP address, use it as host directly
513 * or do a reverse DNS lookup first.
518 /*********************************************************************
520 * Function : get_server_headers
522 * Description : Parses server headers in iob and fills them
523 * into csp->headers so that they can later be
527 * 1 : csp = Current client state (buffers, headers, etc...)
529 * Returns : JB_ERR_OK if everything went fine, or
530 * JB_ERR_PARSE if the headers were incomplete.
532 *********************************************************************/
533 static jb_err get_server_headers(struct client_state *csp)
535 int continue_hack_in_da_house = 0;
538 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
543 * continue hack in da house. Ignore the ending of
544 * this head and continue enlisting header lines.
545 * The reason is described below.
547 enlist(csp->headers, "");
548 continue_hack_in_da_house = 0;
551 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
554 * It's a bodyless continue response, don't
555 * stop header parsing after reaching its end.
557 * As a result Privoxy will concatenate the
558 * next response's head and parse and deliver
559 * the headers as if they belonged to one request.
561 * The client will separate them because of the
562 * empty line between them.
564 * XXX: What we're doing here is clearly against
565 * the intended purpose of the continue header,
566 * and under some conditions (HTTP/1.0 client request)
567 * it's a standard violation.
569 * Anyway, "sort of against the spec" is preferable
570 * to "always getting confused by Continue responses"
571 * (Privoxy's behaviour before this hack was added)
573 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
574 continue_hack_in_da_house = 1;
576 else if (*header == '\0')
579 * If the header is empty, but the Continue hack
580 * isn't active, we can assume that we reached the
581 * end of the buffer before we hit the end of the
584 * Inform the caller an let it decide how to handle it.
589 if (JB_ERR_MEMORY == enlist(csp->headers, header))
592 * XXX: Should we quit the request and return a
593 * out of memory error page instead?
595 log_error(LOG_LEVEL_ERROR,
596 "Out of memory while enlisting server headers. %s lost.",
606 /*********************************************************************
608 * Function : crunch_reason
610 * Description : Translates the crunch reason code into a string.
613 * 1 : rsp = a http_response
615 * Returns : A string with the crunch reason or an error description.
617 *********************************************************************/
618 static const char *crunch_reason(const struct http_response *rsp)
620 char * reason = NULL;
625 return "Internal error while searching for crunch reason";
630 case RSP_REASON_UNSUPPORTED:
631 reason = "Unsupported HTTP feature";
633 case RSP_REASON_BLOCKED:
636 case RSP_REASON_UNTRUSTED:
637 reason = "Untrusted";
639 case RSP_REASON_REDIRECTED:
640 reason = "Redirected";
642 case RSP_REASON_CGI_CALL:
645 case RSP_REASON_NO_SUCH_DOMAIN:
646 reason = "DNS failure";
648 case RSP_REASON_FORWARDING_FAILED:
649 reason = "Forwarding failed";
651 case RSP_REASON_CONNECT_FAILED:
652 reason = "Connection failure";
654 case RSP_REASON_OUT_OF_MEMORY:
655 reason = "Out of memory (may mask other reasons)";
657 case RSP_REASON_CONNECTION_TIMEOUT:
658 reason = "Connection timeout";
660 case RSP_REASON_NO_SERVER_DATA:
661 reason = "No server data received";
664 reason = "No reason recorded";
672 /*********************************************************************
674 * Function : send_crunch_response
676 * Description : Delivers already prepared response for
677 * intercepted requests, logs the interception
678 * and frees the response.
681 * 1 : csp = Current client state (buffers, headers, etc...)
682 * 1 : rsp = Fully prepared response. Will be freed on exit.
686 *********************************************************************/
687 static void send_crunch_response(const struct client_state *csp, struct http_response *rsp)
689 const struct http_request *http = csp->http;
693 assert(rsp->head != NULL);
698 * Not supposed to happen. If it does
699 * anyway, treat it as an unknown error.
701 cgi_error_unknown(csp, rsp, RSP_REASON_INTERNAL_ERROR);
702 /* return code doesn't matter */
707 /* If rsp is still NULL, we have serious internal problems. */
708 log_error(LOG_LEVEL_FATAL,
709 "NULL response in send_crunch_response and cgi_error_unknown failed as well.");
713 * Extract the status code from the actual head
714 * that was send to the client. It is the only
715 * way to get it right for all requests, including
716 * the fixed ones for out-of-memory problems.
718 * A head starts like this: 'HTTP/1.1 200...'
722 status_code[0] = rsp->head[9];
723 status_code[1] = rsp->head[10];
724 status_code[2] = rsp->head[11];
725 status_code[3] = '\0';
727 /* Write the answer to the client */
728 if (write_socket(csp->cfd, rsp->head, rsp->head_length)
729 || write_socket(csp->cfd, rsp->body, rsp->content_length))
731 /* There is nothing we can do about it. */
732 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", csp->http->host);
735 /* Log that the request was crunched and why. */
736 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
737 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
738 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
740 /* Clean up and return */
741 if (cgi_error_memory() != rsp)
743 free_http_response(rsp);
750 /*********************************************************************
752 * Function : request_contains_null_bytes
754 * Description : Checks for NULL bytes in the request and sends
755 * an error message to the client if any were found.
757 * XXX: currently not used, see comment in chat().
760 * 1 : csp = Current client state (buffers, headers, etc...)
761 * 2 : buf = Data from the client's request to check.
762 * 3 : len = The data length.
764 * Returns : TRUE if the request contained one or more NULL bytes, or
767 *********************************************************************/
768 static int request_contains_null_bytes(const struct client_state *csp, char *buf, int len)
770 size_t c_len; /* Request lenght when treated as C string */
777 * Null byte(s) found. Log the request,
778 * return an error response and hang up.
780 size_t tmp_len = c_len;
785 * Replace NULL byte(s) with '°' characters
786 * so the request can be logged as string.
787 * XXX: Is there a better replacement character?
790 tmp_len += strlen(buf+tmp_len);
791 } while (tmp_len < len);
793 log_error(LOG_LEVEL_ERROR, "%s\'s request contains at least one NULL byte "
794 "(length=%d, strlen=%u).", csp->ip_addr_str, len, c_len);
795 log_error(LOG_LEVEL_HEADER,
796 "Offending request data with NULL bytes turned into \'°\' characters: %s", buf);
798 write_socket(csp->cfd, NULL_BYTE_RESPONSE, strlen(NULL_BYTE_RESPONSE));
800 /* XXX: Log correct size */
801 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
811 /*********************************************************************
813 * Function : crunch_response_triggered
815 * Description : Checks if the request has to be crunched,
816 * and delivers the crunch response if necessary.
819 * 1 : csp = Current client state (buffers, headers, etc...)
820 * 2 : crunchers = list of cruncher functions to run
822 * Returns : TRUE if the request was answered with a crunch response
825 *********************************************************************/
826 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
828 struct http_response *rsp = NULL;
829 const struct cruncher *c;
832 * If CGI request crunching is disabled,
833 * check the CGI dispatcher out of order to
834 * prevent unintentional blocks or redirects.
836 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
837 && (NULL != (rsp = dispatch_cgi(csp))))
839 /* Deliver, log and free the interception response. */
840 send_crunch_response(csp, rsp);
844 for (c = crunchers; c->cruncher != NULL; c++)
847 * Check the cruncher if either Privoxy is toggled
848 * on and the request isn't forced, or if the cruncher
849 * applies to forced requests as well.
851 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
852 !(csp->flags & CSP_FLAG_FORCED)) ||
853 (c->flags & CF_IGNORE_FORCE))
855 rsp = c->cruncher(csp);
858 /* Deliver, log and free the interception response. */
859 send_crunch_response(csp, rsp);
860 #ifdef FEATURE_STATISTICS
861 if (c->flags & CF_COUNT_AS_REJECT)
863 csp->flags |= CSP_FLAG_REJECTED;
865 #endif /* def FEATURE_STATISTICS */
876 /*********************************************************************
878 * Function : build_request_line
880 * Description : Builds the HTTP request line.
882 * If a HTTP forwarder is used it expects the whole URL,
883 * web servers only get the path.
886 * 1 : csp = Current client state (buffers, headers, etc...)
887 * 2 : fwd = The forwarding spec used for the request
888 * XXX: Should use http->fwd instead.
889 * 3 : request_line = The old request line which will be replaced.
891 * Returns : Nothing. Terminates in case of memory problems.
893 *********************************************************************/
894 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
896 struct http_request *http = csp->http;
898 assert(http->ssl == 0);
901 * Downgrade http version from 1.1 to 1.0
902 * if +downgrade action applies.
904 if ( (csp->action->flags & ACTION_DOWNGRADE)
905 && (!strcmpic(http->ver, "HTTP/1.1")))
908 http->ver = strdup("HTTP/1.0");
910 if (http->ver == NULL)
912 log_error(LOG_LEVEL_FATAL, "Out of memory downgrading HTTP version");
917 * Rebuild the request line.
919 freez(*request_line);
920 *request_line = strdup(http->gpc);
921 string_append(request_line, " ");
923 if (fwd->forward_host)
925 string_append(request_line, http->url);
929 string_append(request_line, http->path);
931 string_append(request_line, " ");
932 string_append(request_line, http->ver);
934 if (*request_line == NULL)
936 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
938 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
942 /*********************************************************************
944 * Function : change_request_destination
946 * Description : Parse a (rewritten) request line and regenerate
947 * the http request data.
950 * 1 : csp = Current client state (buffers, headers, etc...)
952 * Returns : Forwards the parse_http_request() return code.
953 * Terminates in case of memory problems.
955 *********************************************************************/
956 static jb_err change_request_destination(struct client_state *csp)
958 struct http_request *http = csp->http;
961 log_error(LOG_LEVEL_INFO, "Rewrite detected: %s", csp->headers->first->str);
962 free_http_request(http);
963 err = parse_http_request(csp->headers->first->str, http);
964 if (JB_ERR_OK != err)
966 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
967 jb_err_to_string(err));
971 /* XXX: ocmd is a misleading name */
972 http->ocmd = strdup(http->cmd);
973 if (http->ocmd == NULL)
975 log_error(LOG_LEVEL_FATAL,
976 "Out of memory copying rewritten HTTP request line");
984 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
985 /*********************************************************************
987 * Function : server_response_is_complete
989 * Description : Determines whether we should stop reading
990 * from the server socket.
993 * 1 : csp = Current client state (buffers, headers, etc...)
994 * 2 : content_length = Length of content received so far.
996 * Returns : TRUE if the response is complete,
999 *********************************************************************/
1000 static int server_response_is_complete(struct client_state *csp,
1001 unsigned long long content_length)
1003 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1005 if (!strcmpic(csp->http->gpc, "HEAD"))
1008 * "HEAD" implies no body, we are thus expecting
1009 * no content. XXX: incomplete "list" of methods?
1011 csp->expected_content_length = 0;
1012 content_length_known = TRUE;
1015 if (csp->http->status == 304)
1018 * Expect no body. XXX: incomplete "list" of status codes?
1020 csp->expected_content_length = 0;
1021 content_length_known = TRUE;
1024 return (content_length_known && ((0 == csp->expected_content_length)
1025 || (csp->expected_content_length <= content_length)));
1029 /*********************************************************************
1031 * Function : wait_for_alive_connections
1033 * Description : Waits for alive connections to timeout.
1039 *********************************************************************/
1040 static void wait_for_alive_connections(void)
1042 int connections_alive = close_unusable_connections();
1044 while (0 < connections_alive)
1046 log_error(LOG_LEVEL_CONNECT,
1047 "Waiting for %d connections to timeout.",
1050 connections_alive = close_unusable_connections();
1053 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1058 /*********************************************************************
1060 * Function : save_connection_destination
1062 * Description : Remembers a connection for reuse later on.
1065 * 1 : sfd = Open socket to remember.
1066 * 2 : http = The destination for the connection.
1067 * 3 : fwd = The forwarder settings used.
1068 * 3 : server_connection = storage.
1072 *********************************************************************/
1073 void save_connection_destination(jb_socket sfd,
1074 const struct http_request *http,
1075 const struct forward_spec *fwd,
1076 struct reusable_connection *server_connection)
1078 assert(sfd != JB_INVALID_SOCKET);
1079 assert(NULL != http->host);
1081 server_connection->sfd = sfd;
1082 server_connection->host = strdup(http->host);
1083 if (NULL == server_connection->host)
1085 log_error(LOG_LEVEL_FATAL, "Out of memory saving socket.");
1087 server_connection->port = http->port;
1089 assert(NULL != fwd);
1090 assert(server_connection->gateway_host == NULL);
1091 assert(server_connection->gateway_port == 0);
1092 assert(server_connection->forwarder_type == 0);
1093 assert(server_connection->forward_host == NULL);
1094 assert(server_connection->forward_port == 0);
1096 server_connection->forwarder_type = fwd->type;
1097 if (NULL != fwd->gateway_host)
1099 server_connection->gateway_host = strdup(fwd->gateway_host);
1100 if (NULL == server_connection->gateway_host)
1102 log_error(LOG_LEVEL_FATAL, "Out of memory saving gateway_host.");
1107 server_connection->gateway_host = NULL;
1109 server_connection->gateway_port = fwd->gateway_port;
1111 if (NULL != fwd->forward_host)
1113 server_connection->forward_host = strdup(fwd->forward_host);
1114 if (NULL == server_connection->forward_host)
1116 log_error(LOG_LEVEL_FATAL, "Out of memory saving forward_host.");
1121 server_connection->forward_host = NULL;
1123 server_connection->forward_port = fwd->forward_port;
1125 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1128 /*********************************************************************
1130 * Function : mark_server_socket_tainted
1132 * Description : Makes sure we don't reuse a server socket
1133 * (if we didn't read everything the server sent
1134 * us reusing the socket would lead to garbage).
1137 * 1 : csp = Current client state (buffers, headers, etc...)
1141 *********************************************************************/
1142 static void mark_server_socket_tainted(struct client_state *csp)
1144 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE))
1146 log_error(LOG_LEVEL_CONNECT,
1147 "Marking the server socket %d tainted.", csp->sfd);
1148 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1152 /*********************************************************************
1154 * Function : get_request_line
1156 * Description : Read the client request line.
1159 * 1 : csp = Current client state (buffers, headers, etc...)
1161 * Returns : Pointer to request line or NULL in case of errors.
1163 *********************************************************************/
1164 static char *get_request_line(struct client_state *csp)
1166 char buf[BUFFER_SIZE];
1167 char *request_line = NULL;
1170 memset(buf, 0, sizeof(buf));
1174 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1176 log_error(LOG_LEVEL_ERROR,
1177 "Stopped waiting for the request line.");
1178 write_socket(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1179 strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE));
1183 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1185 if (len <= 0) return NULL;
1188 * If there is no memory left for buffering the
1189 * request, there is nothing we can do but hang up
1191 if (add_to_iob(csp, buf, len))
1196 request_line = get_header(csp->iob);
1198 } while ((NULL != request_line) && ('\0' == *request_line));
1200 return request_line;
1205 /*********************************************************************
1207 * Function : receive_client_request
1209 * Description : Read the client's request (more precisely the
1210 * client headers) and answer it if necessary.
1212 * Note that since we're not using select() we could get
1213 * blocked here if a client connected, then didn't say
1217 * 1 : csp = Current client state (buffers, headers, etc...)
1219 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1221 *********************************************************************/
1222 static jb_err receive_client_request(struct client_state *csp)
1224 char buf[BUFFER_SIZE];
1227 struct http_request *http;
1231 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1232 struct list header_list;
1233 struct list *headers = &header_list;
1237 memset(buf, 0, sizeof(buf));
1239 req = get_request_line(csp);
1242 return JB_ERR_PARSE;
1244 assert(*req != '\0');
1246 if (client_protocol_is_unsupported(csp, req))
1248 return JB_ERR_PARSE;
1251 #ifdef FEATURE_FORCE_LOAD
1253 * If this request contains the FORCE_PREFIX and blocks
1254 * aren't enforced, get rid of it and set the force flag.
1256 if (strstr(req, FORCE_PREFIX))
1258 if (csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS)
1260 log_error(LOG_LEVEL_FORCE,
1261 "Ignored force prefix in request: \"%s\".", req);
1265 strclean(req, FORCE_PREFIX);
1266 log_error(LOG_LEVEL_FORCE, "Enforcing request: \"%s\".", req);
1267 csp->flags |= CSP_FLAG_FORCED;
1270 #endif /* def FEATURE_FORCE_LOAD */
1272 err = parse_http_request(req, http);
1274 if (JB_ERR_OK != err)
1276 write_socket(csp->cfd, CHEADER, strlen(CHEADER));
1277 /* XXX: Use correct size */
1278 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1279 log_error(LOG_LEVEL_ERROR,
1280 "Couldn't parse request line received from %s: %s",
1281 csp->ip_addr_str, jb_err_to_string(err));
1283 free_http_request(http);
1284 return JB_ERR_PARSE;
1287 /* grab the rest of the client's headers */
1291 p = get_header(csp->iob);
1295 /* There are no additional headers to read. */
1302 * We didn't receive a complete header
1303 * line yet, get the rest of it.
1305 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1307 log_error(LOG_LEVEL_ERROR,
1308 "Stopped grabbing the client headers.");
1309 destroy_list(headers);
1310 return JB_ERR_PARSE;
1313 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1316 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1317 destroy_list(headers);
1318 return JB_ERR_PARSE;
1321 if (add_to_iob(csp, buf, len))
1324 * If there is no memory left for buffering the
1325 * request, there is nothing we can do but hang up
1327 destroy_list(headers);
1328 return JB_ERR_MEMORY;
1334 * We were able to read a complete
1335 * header and can finaly enlist it.
1342 if (http->host == NULL)
1345 * If we still don't know the request destination,
1346 * the request is invalid or the client uses
1347 * Privoxy without its knowledge.
1349 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1352 * Our attempts to get the request destination
1353 * elsewhere failed or Privoxy is configured
1354 * to only accept proxy requests.
1356 * An error response has already been send
1357 * and we're done here.
1359 return JB_ERR_PARSE;
1364 * Determine the actions for this URL
1366 #ifdef FEATURE_TOGGLE
1367 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1369 /* Most compatible set of actions (i.e. none) */
1370 init_current_action(csp->action);
1373 #endif /* ndef FEATURE_TOGGLE */
1375 get_url_actions(csp, http);
1379 * Save a copy of the original request for logging
1381 http->ocmd = strdup(http->cmd);
1382 if (http->ocmd == NULL)
1384 log_error(LOG_LEVEL_FATAL,
1385 "Out of memory copying HTTP request line");
1387 enlist(csp->headers, http->cmd);
1389 /* Append the previously read headers */
1390 list_append_list_unique(csp->headers, headers);
1391 destroy_list(headers);
1398 /*********************************************************************
1400 * Function : parse_client_request
1402 * Description : Parses the client's request and decides what to do
1405 * Note that since we're not using select() we could get
1406 * blocked here if a client connected, then didn't say
1410 * 1 : csp = Current client state (buffers, headers, etc...)
1412 * Returns : JB_ERR_OK or JB_ERR_PARSE
1414 *********************************************************************/
1415 static jb_err parse_client_request(struct client_state *csp)
1417 struct http_request *http = csp->http;
1420 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1421 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1422 && (!strcmpic(csp->http->ver, "HTTP/1.1"))
1423 && (csp->http->ssl == 0))
1425 /* Assume persistence until further notice */
1426 csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1428 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1430 err = sed(csp, FILTER_CLIENT_HEADERS);
1431 if (JB_ERR_OK != err)
1433 /* XXX: Should be handled in sed(). */
1434 assert(err == JB_ERR_PARSE);
1435 log_error(LOG_LEVEL_FATAL, "Failed to parse client headers.");
1437 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1439 /* Check request line for rewrites. */
1440 if ((NULL == csp->headers->first->str)
1441 || (strcmp(http->cmd, csp->headers->first->str) &&
1442 (JB_ERR_OK != change_request_destination(csp))))
1445 * A header filter broke the request line - bail out.
1447 write_socket(csp->cfd, MESSED_UP_REQUEST_RESPONSE, strlen(MESSED_UP_REQUEST_RESPONSE));
1448 /* XXX: Use correct size */
1449 log_error(LOG_LEVEL_CLF,
1450 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1451 log_error(LOG_LEVEL_ERROR,
1452 "Invalid request line after applying header filters.");
1453 free_http_request(http);
1455 return JB_ERR_PARSE;
1458 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1459 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
1461 unsigned long long buffered_request_bytes =
1462 (unsigned long long)(csp->iob->eod - csp->iob->cur);
1464 if ((csp->expected_client_content_length != 0)
1465 && (buffered_request_bytes != 0))
1467 if (csp->expected_client_content_length >= buffered_request_bytes)
1469 csp->expected_client_content_length -= buffered_request_bytes;
1470 log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1471 "to account for the %llu ones we already got.",
1472 csp->expected_client_content_length, buffered_request_bytes);
1476 assert(csp->iob->eod > csp->iob->cur + csp->expected_client_content_length);
1477 csp->iob->eod = csp->iob->cur + csp->expected_client_content_length;
1478 log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1479 "Marking the server socket tainted after throwing %llu bytes away.",
1480 buffered_request_bytes - csp->expected_client_content_length);
1481 csp->expected_client_content_length = 0;
1482 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1485 if (csp->expected_client_content_length == 0)
1487 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1491 if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1492 && ((csp->iob->cur[0] != '\0')
1493 || (csp->expected_client_content_length != 0)))
1495 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1496 if (strcmpic(csp->http->gpc, "GET")
1497 && strcmpic(csp->http->gpc, "HEAD")
1498 && strcmpic(csp->http->gpc, "TRACE")
1499 && strcmpic(csp->http->gpc, "OPTIONS")
1500 && strcmpic(csp->http->gpc, "DELETE"))
1502 /* XXX: this is an incomplete hack */
1503 csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1504 log_error(LOG_LEVEL_CONNECT,
1505 "There might be a request body. The connection will not be kept alive.");
1509 /* XXX: and so is this */
1510 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1511 log_error(LOG_LEVEL_CONNECT,
1512 "Possible pipeline attempt detected. The connection will not "
1513 "be kept alive and we will only serve the first request.");
1514 /* Nuke the pipelined requests from orbit, just to be sure. */
1515 csp->iob->buf[0] = '\0';
1516 csp->iob->eod = csp->iob->cur = csp->iob->buf;
1521 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1522 log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1525 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1532 /*********************************************************************
1536 * Description : Once a connection to the client has been accepted,
1537 * this function is called (via serve()) to handle the
1538 * main business of the communication. When this
1539 * function returns, the caller must close the client
1542 * FIXME: chat is nearly thousand lines long.
1546 * 1 : csp = Current client state (buffers, headers, etc...)
1548 * Returns : Nothing.
1550 *********************************************************************/
1551 static void chat(struct client_state *csp)
1553 char buf[BUFFER_SIZE];
1560 int ms_iis5_hack = 0;
1561 unsigned long long byte_count = 0;
1562 int forwarded_connect_retries = 0;
1563 int max_forwarded_connect_retries = csp->config->forwarded_connect_retries;
1564 const struct forward_spec *fwd;
1565 struct http_request *http;
1566 long len = 0; /* for buffer sizes (and negative error codes) */
1568 /* Function that does the content filtering for the current request */
1569 filter_function_ptr content_filter = NULL;
1571 /* Skeleton for HTTP response, if we should intercept the request */
1572 struct http_response *rsp;
1573 struct timeval timeout;
1575 memset(buf, 0, sizeof(buf));
1579 if (receive_client_request(csp) != JB_ERR_OK)
1583 if (parse_client_request(csp) != JB_ERR_OK)
1588 /* decide how to route the HTTP request */
1589 fwd = forward_url(csp, http);
1592 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
1593 /* Never get here - LOG_LEVEL_FATAL causes program exit */
1598 * build the http request to send to the server
1599 * we have to do one of the following:
1601 * create = use the original HTTP request to create a new
1602 * HTTP request that has either the path component
1603 * without the http://domainspec (w/path) or the
1604 * full orininal URL (w/url)
1605 * Note that the path and/or the HTTP version may
1606 * have been altered by now.
1608 * connect = Open a socket to the host:port of the server
1609 * and short-circuit server and client socket.
1611 * pass = Pass the request unchanged if forwarding a CONNECT
1612 * request to a parent proxy. Note that we'll be sending
1613 * the CFAIL message ourselves if connecting to the parent
1614 * fails, but we won't send a CSUCCEED message if it works,
1615 * since that would result in a double message (ours and the
1616 * parent's). After sending the request to the parent, we simply
1619 * here's the matrix:
1622 * +--------+--------+
1624 * 0 | create | connect|
1626 * Forwarding +--------+--------+
1628 * 1 | create | pass |
1630 * +--------+--------+
1634 if (http->ssl && connect_port_is_forbidden(csp))
1636 const char *acceptable_connect_ports =
1637 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
1638 assert(NULL != acceptable_connect_ports);
1639 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
1640 "limit-connect{%s} doesn't allow CONNECT requests to port %d.",
1641 csp->ip_addr_str, acceptable_connect_ports, csp->http->port);
1642 csp->action->flags |= ACTION_BLOCK;
1648 freez(csp->headers->first->str);
1649 build_request_line(csp, fwd, &csp->headers->first->str);
1653 * We have a request. Check if one of the crunchers wants it.
1655 if (crunch_response_triggered(csp, crunchers_all))
1658 * Yes. The client got the crunch response
1659 * and we are done here after cleaning up.
1661 /* XXX: why list_remove_all()? */
1662 list_remove_all(csp->headers);
1667 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
1669 if (fwd->forward_host)
1671 log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
1672 fwd->forward_host, fwd->forward_port, http->hostport);
1676 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
1679 /* here we connect to the server, gateway, or the forwarder */
1681 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1682 if ((csp->sfd != JB_INVALID_SOCKET)
1683 && socket_is_still_usable(csp->sfd)
1684 && connection_destination_matches(&csp->server_connection, http, fwd))
1686 log_error(LOG_LEVEL_CONNECT,
1687 "Reusing server socket %u. Opened for %s.",
1688 csp->sfd, csp->server_connection.host);
1692 if (csp->sfd != JB_INVALID_SOCKET)
1694 log_error(LOG_LEVEL_CONNECT,
1695 "Closing server socket %u. Opened for %s.",
1696 csp->sfd, csp->server_connection.host);
1697 close_socket(csp->sfd);
1698 mark_connection_closed(&csp->server_connection);
1700 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1702 while ((csp->sfd = forwarded_connect(fwd, http, csp))
1703 && (errno == EINVAL)
1704 && (forwarded_connect_retries++ < max_forwarded_connect_retries))
1706 log_error(LOG_LEVEL_ERROR,
1707 "failed request #%u to connect to %s. Trying again.",
1708 forwarded_connect_retries, http->hostport);
1711 if (csp->sfd == JB_INVALID_SOCKET)
1713 if (fwd->type != SOCKS_NONE)
1716 rsp = error_response(csp, "forwarding-failed");
1718 else if (errno == EINVAL)
1720 rsp = error_response(csp, "no-such-domain");
1724 rsp = error_response(csp, "connect-failed");
1725 log_error(LOG_LEVEL_CONNECT, "connect to: %s failed: %E",
1729 /* Write the answer to the client */
1732 send_crunch_response(csp, rsp);
1737 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1738 save_connection_destination(csp->sfd, http, fwd, &csp->server_connection);
1739 csp->server_connection.keep_alive_timeout = (unsigned)csp->config->keep_alive_timeout;
1741 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1743 hdr = list_to_text(csp->headers);
1746 /* FIXME Should handle error properly */
1747 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
1749 list_remove_all(csp->headers);
1751 if (fwd->forward_host || (http->ssl == 0))
1754 * Write the client's (modified) header to the server
1755 * (along with anything else that may be in the buffer)
1757 if (write_socket(csp->sfd, hdr, strlen(hdr))
1758 || (flush_socket(csp->sfd, csp->iob) < 0))
1760 log_error(LOG_LEVEL_CONNECT,
1761 "write header to: %s failed: %E", http->hostport);
1763 rsp = error_response(csp, "connect-failed");
1766 send_crunch_response(csp, rsp);
1776 * We're running an SSL tunnel and we're not forwarding,
1777 * so just send the "connect succeeded" message to the
1778 * client, flush the rest, and get out of the way.
1780 if (write_socket(csp->cfd, CSUCCEED, strlen(CSUCCEED)))
1788 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
1790 csp->server_connection.request_sent = time(NULL);
1792 /* we're finished with the client's header */
1795 maxfd = (csp->cfd > csp->sfd) ? csp->cfd : csp->sfd;
1797 /* pass data between the client and server
1798 * until one or the other shuts down the connection.
1807 * FD_ZERO here seems to point to an errant macro which crashes.
1808 * So do this by hand for now...
1810 memset(&rfds,0x00,sizeof(fd_set));
1814 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1815 if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
1820 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1822 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1825 log_error(LOG_LEVEL_CONNECT,
1826 "Allowing the client to continue talking. "
1827 "Expecting %llu bytes.", csp->expected_client_content_length);
1829 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1830 FD_SET(csp->cfd, &rfds);
1833 FD_SET(csp->sfd, &rfds);
1835 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1836 if ((csp->flags & CSP_FLAG_CHUNKED)
1837 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
1838 && ((csp->iob->eod - csp->iob->cur) >= 5)
1839 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
1841 log_error(LOG_LEVEL_CONNECT,
1842 "Looks like we read the last chunk together with "
1843 "the server headers. We better stop reading.");
1844 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
1845 csp->expected_content_length = byte_count;
1846 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
1848 if (server_body && server_response_is_complete(csp, byte_count))
1850 log_error(LOG_LEVEL_CONNECT,
1851 "Done reading from server. Expected content length: %llu. "
1852 "Actual content length: %llu. Most recently received: %d.",
1853 csp->expected_content_length, byte_count, len);
1856 * XXX: should not jump around,
1857 * chat() is complicated enough already.
1861 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1863 timeout.tv_sec = csp->config->socket_timeout;
1864 timeout.tv_usec = 0;
1865 n = select((int)maxfd+1, &rfds, NULL, NULL, &timeout);
1869 log_error(LOG_LEVEL_ERROR,
1870 "Didn't receive data in time: %s", http->url);
1871 if ((byte_count == 0) && (http->ssl == 0))
1873 send_crunch_response(csp, error_response(csp, "connection-timeout"));
1875 mark_server_socket_tainted(csp);
1880 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
1881 mark_server_socket_tainted(csp);
1886 * This is the body of the browser's request,
1887 * just read and write it.
1889 * XXX: Make sure the client doesn't use pipelining
1890 * behind Privoxy's back.
1892 if (FD_ISSET(csp->cfd, &rfds))
1894 unsigned max_bytes_to_read = sizeof(buf) - 1;
1896 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1897 if (csp->expected_client_content_length != 0)
1899 if (csp->expected_client_content_length < (sizeof(buf) - 1))
1901 max_bytes_to_read = csp->expected_client_content_length;
1903 log_error(LOG_LEVEL_CONNECT,
1904 "Waiting for up to %d bytes from the client.",
1907 assert(max_bytes_to_read < sizeof(buf));
1908 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1910 len = read_socket(csp->cfd, buf, max_bytes_to_read);
1914 /* XXX: not sure if this is necessary. */
1915 mark_server_socket_tainted(csp);
1916 break; /* "game over, man" */
1919 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1920 if (csp->expected_client_content_length != 0)
1922 assert(len <= max_bytes_to_read);
1923 csp->expected_client_content_length -= len;
1924 log_error(LOG_LEVEL_CONNECT,
1925 "Expected client content length set to %llu "
1926 "after reading %d bytes.",
1927 csp->expected_client_content_length, len);
1928 if (csp->expected_client_content_length == 0)
1930 log_error(LOG_LEVEL_CONNECT,
1931 "Done reading from the client.");
1932 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1935 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1937 if (write_socket(csp->sfd, buf, (size_t)len))
1939 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
1940 mark_server_socket_tainted(csp);
1947 * The server wants to talk. It could be the header or the body.
1948 * If `hdr' is null, then it's the header otherwise it's the body.
1949 * FIXME: Does `hdr' really mean `host'? No.
1951 if (FD_ISSET(csp->sfd, &rfds))
1953 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1954 if (!socket_is_still_usable(csp->cfd))
1957 log_error(LOG_LEVEL_CONNECT,
1958 "The server still wants to talk, but the client may already have hung up on us.");
1960 log_error(LOG_LEVEL_CONNECT,
1961 "The server still wants to talk, but the client hung up on us.");
1962 mark_server_socket_tainted(csp);
1964 #endif /* def _WIN32 */
1966 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1969 len = read_socket(csp->sfd, buf, sizeof(buf) - 1);
1973 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
1975 if (http->ssl && (fwd->forward_host == NULL))
1978 * Just hang up. We already confirmed the client's CONNECT
1979 * request with status code 200 and unencrypted content is
1980 * no longer welcome.
1982 log_error(LOG_LEVEL_ERROR,
1983 "CONNECT already confirmed. Unable to tell the client about the problem.");
1986 else if (byte_count)
1989 * Just hang up. We already transmitted the original headers
1990 * and parts of the original content and therefore missed the
1991 * chance to send an error message (without risking data corruption).
1993 * XXX: we could retry with a fancy range request here.
1995 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
1996 "Unable to tell the client about the problem.");
1997 mark_server_socket_tainted(csp);
2001 * XXX: Consider handling the cases above the same.
2003 mark_server_socket_tainted(csp);
2007 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2008 if (csp->flags & CSP_FLAG_CHUNKED)
2010 if ((len >= 5) && !memcmp(buf+len-5, "0\r\n\r\n", 5))
2012 /* XXX: this is a temporary hack */
2013 log_error(LOG_LEVEL_CONNECT,
2014 "Looks like we reached the end of the last chunk. "
2015 "We better stop reading.");
2016 csp->expected_content_length = byte_count + (unsigned long long)len;
2017 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2021 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2024 * Add a trailing zero to let be able to use string operations.
2025 * XXX: do we still need this with filter_popups gone?
2030 * Normally, this would indicate that we've read
2031 * as much as the server has sent us and we can
2032 * close the client connection. However, Microsoft
2033 * in its wisdom has released IIS/5 with a bug that
2034 * prevents it from sending the trailing \r\n in
2035 * a 302 redirect header (and possibly other headers).
2036 * To work around this if we've haven't parsed
2037 * a full header we'll append a trailing \r\n
2038 * and see if this now generates a valid one.
2040 * This hack shouldn't have any impacts. If we've
2041 * already transmitted the header or if this is a
2042 * SSL connection, then we won't bother with this
2043 * hack. So we only work on partially received
2044 * headers. If we append a \r\n and this still
2045 * doesn't generate a valid header, then we won't
2046 * transmit anything to the client.
2051 if (server_body || http->ssl)
2054 * If we have been buffering up the document,
2055 * now is the time to apply content modification
2056 * and send the result to the client.
2060 p = execute_content_filter(csp, content_filter);
2062 * If the content filter fails, use the original
2063 * buffer and length.
2064 * (see p != NULL ? p : csp->iob->cur below)
2068 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2071 if (JB_ERR_OK != update_server_headers(csp))
2073 log_error(LOG_LEVEL_FATAL,
2074 "Failed to update server headers. after filtering.");
2077 hdr = list_to_text(csp->headers);
2080 /* FIXME Should handle error properly */
2081 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2084 if (write_socket(csp->cfd, hdr, strlen(hdr))
2085 || write_socket(csp->cfd,
2086 ((p != NULL) ? p : csp->iob->cur), (size_t)csp->content_length))
2088 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2091 mark_server_socket_tainted(csp);
2099 break; /* "game over, man" */
2103 * This is NOT the body, so
2104 * Let's pretend the server just sent us a blank line.
2106 snprintf(buf, sizeof(buf), "\r\n");
2107 len = (int)strlen(buf);
2110 * Now, let the normal header parsing algorithm below do its
2111 * job. If it fails, we'll exit instead of continuing.
2118 * If this is an SSL connection or we're in the body
2119 * of the server document, just write it to the client,
2120 * unless we need to buffer the body for later content-filtering
2122 if (server_body || http->ssl)
2127 * If there is no memory left for buffering the content, or the buffer limit
2128 * has been reached, switch to non-filtering mode, i.e. make & write the
2129 * header, flush the iob and buf, and get out of the way.
2131 if (add_to_iob(csp, buf, len))
2136 log_error(LOG_LEVEL_INFO,
2137 "Flushing header and buffers. Stepping back from filtering.");
2139 hdr = list_to_text(csp->headers);
2143 * Memory is too tight to even generate the header.
2144 * Send our static "Out-of-memory" page.
2146 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
2147 rsp = cgi_error_memory();
2148 send_crunch_response(csp, rsp);
2149 mark_server_socket_tainted(csp);
2152 hdrlen = strlen(hdr);
2154 if (write_socket(csp->cfd, hdr, hdrlen)
2155 || ((flushed = flush_socket(csp->cfd, csp->iob)) < 0)
2156 || (write_socket(csp->cfd, buf, (size_t)len)))
2158 log_error(LOG_LEVEL_CONNECT,
2159 "Flush header and buffers to client failed: %E");
2161 mark_server_socket_tainted(csp);
2166 * Reset the byte_count to the amount of bytes
2167 * we just flushed. len will be added a few lines below,
2168 * hdrlen doesn't matter for LOG_LEVEL_CLF.
2170 byte_count = (unsigned long long)flushed;
2172 content_filter = NULL;
2178 if (write_socket(csp->cfd, buf, (size_t)len))
2180 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
2181 mark_server_socket_tainted(csp);
2185 byte_count += (unsigned long long)len;
2190 const char *header_start;
2192 * We're still looking for the end of the server's header.
2193 * Buffer up the data we just read. If that fails, there's
2194 * little we can do but send our static out-of-memory page.
2196 if (add_to_iob(csp, buf, len))
2198 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
2199 rsp = cgi_error_memory();
2200 send_crunch_response(csp, rsp);
2201 mark_server_socket_tainted(csp);
2205 header_start = csp->iob->cur;
2207 /* Convert iob into something sed() can digest */
2208 if (JB_ERR_PARSE == get_server_headers(csp))
2213 * Well, we tried our MS IIS/5 hack and it didn't work.
2214 * The header is incomplete and there isn't anything
2215 * we can do about it.
2217 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
2218 "Applying the MS IIS5 hack didn't help.");
2219 log_error(LOG_LEVEL_CLF,
2220 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2221 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2222 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2223 mark_server_socket_tainted(csp);
2229 * Since we have to wait for more from the server before
2230 * we can parse the headers we just continue here.
2232 long header_offset = csp->iob->cur - header_start;
2233 assert(csp->iob->cur >= header_start);
2234 byte_count += (unsigned long long)(len - header_offset);
2235 log_error(LOG_LEVEL_CONNECT, "Continuing buffering headers. "
2236 "byte_count: %llu. header_offset: %d. len: %d.",
2237 byte_count, header_offset, len);
2242 /* Did we actually get anything? */
2243 if (NULL == csp->headers->first)
2245 log_error(LOG_LEVEL_ERROR,
2246 "Empty server or forwarder response received on socket %d.", csp->sfd);
2247 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2248 send_crunch_response(csp, error_response(csp, "no-server-data"));
2249 free_http_request(http);
2250 mark_server_socket_tainted(csp);
2254 assert(csp->headers->first->str);
2256 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
2257 strncmpic(csp->headers->first->str, "ICY", 3))
2260 * It doesn't look like a HTTP (or Shoutcast) response:
2261 * tell the client and log the problem.
2263 if (strlen(csp->headers->first->str) > 30)
2265 csp->headers->first->str[30] = '\0';
2267 log_error(LOG_LEVEL_ERROR,
2268 "Invalid server or forwarder response. Starts with: %s",
2269 csp->headers->first->str);
2270 log_error(LOG_LEVEL_CLF,
2271 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2272 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2273 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2274 free_http_request(http);
2275 mark_server_socket_tainted(csp);
2280 * We have now received the entire server header,
2281 * filter it and send the result to the client
2283 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
2285 log_error(LOG_LEVEL_FATAL, "Failed to parse server headers.");
2287 hdr = list_to_text(csp->headers);
2290 /* FIXME Should handle error properly */
2291 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2294 csp->server_connection.response_received = time(NULL);
2296 if (crunch_response_triggered(csp, crunchers_light))
2299 * One of the tags created by a server-header
2300 * tagger triggered a crunch. We already
2301 * delivered the crunch response to the client
2302 * and are done here after cleaning up.
2305 mark_server_socket_tainted(csp);
2308 /* Buffer and pcrs filter this if appropriate. */
2310 if (!http->ssl) /* We talk plaintext */
2312 content_filter = get_filter_function(csp);
2315 * Only write if we're not buffering for content modification
2317 if (!content_filter)
2320 * Write the server's (modified) header to
2321 * the client (along with anything else that
2322 * may be in the buffer)
2325 if (write_socket(csp->cfd, hdr, strlen(hdr))
2326 || ((len = flush_socket(csp->cfd, csp->iob)) < 0))
2328 log_error(LOG_LEVEL_CONNECT, "write header to client failed: %E");
2331 * The write failed, so don't bother mentioning it
2332 * to the client... it probably can't hear us anyway.
2335 mark_server_socket_tainted(csp);
2339 byte_count += (unsigned long long)len;
2344 * XXX: the header lenght should probably
2345 * be calculated by get_server_headers().
2347 long header_length = csp->iob->cur - header_start;
2348 assert(csp->iob->cur > header_start);
2349 byte_count += (unsigned long long)(len - header_length);
2352 /* we're finished with the server's header */
2358 * If this was a MS IIS/5 hack then it means the server
2359 * has already closed the connection. Nothing more to read.
2364 log_error(LOG_LEVEL_ERROR,
2365 "Closed server connection detected. "
2366 "Applying the MS IIS5 hack didn't help.");
2367 log_error(LOG_LEVEL_CLF,
2368 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
2369 write_socket(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
2370 strlen(INVALID_SERVER_HEADERS_RESPONSE));
2371 mark_server_socket_tainted(csp);
2377 mark_server_socket_tainted(csp);
2378 return; /* huh? we should never get here */
2381 if (csp->content_length == 0)
2384 * If Privoxy didn't recalculate the Content-Lenght,
2385 * byte_count is still correct.
2387 csp->content_length = byte_count;
2390 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2391 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2392 && (csp->expected_content_length != byte_count))
2394 log_error(LOG_LEVEL_CONNECT,
2395 "Received %llu bytes while expecting %llu.",
2396 byte_count, csp->expected_content_length);
2397 mark_server_socket_tainted(csp);
2401 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
2402 csp->ip_addr_str, http->ocmd, csp->content_length);
2404 csp->server_connection.timestamp = time(NULL);
2408 /*********************************************************************
2412 * Description : This is little more than chat. We only "serve" to
2413 * to close (or remember) any socket that chat may have
2417 * 1 : csp = Current client state (buffers, headers, etc...)
2421 *********************************************************************/
2423 void serve(struct client_state *csp)
2424 #else /* ifndef AMIGA */
2425 static void serve(struct client_state *csp)
2426 #endif /* def AMIGA */
2428 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2429 static int monitor_thread_running = 0;
2430 int continue_chatting = 0;
2431 unsigned int latency = 0;
2437 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
2438 && !(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
2440 log_error(LOG_LEVEL_CONNECT, "The server didn't specify how long "
2441 "the connection will stay open. Assume it's only a second.");
2442 csp->server_connection.keep_alive_timeout = 1;
2445 continue_chatting = (csp->config->feature_flags
2446 & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2447 && (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
2448 && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
2449 && (csp->cfd != JB_INVALID_SOCKET)
2450 && (csp->sfd != JB_INVALID_SOCKET)
2451 && socket_is_still_usable(csp->sfd)
2452 && (latency < csp->server_connection.keep_alive_timeout);
2454 if (continue_chatting)
2456 unsigned int client_timeout = (unsigned)csp->server_connection.keep_alive_timeout - latency;
2457 log_error(LOG_LEVEL_CONNECT,
2458 "Waiting for the next client request. "
2459 "Keeping the server socket %d to %s open.",
2460 csp->sfd, csp->server_connection.host);
2462 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
2463 && data_is_available(csp->cfd, (int)client_timeout)
2464 && socket_is_still_usable(csp->cfd))
2466 log_error(LOG_LEVEL_CONNECT, "Client request arrived in "
2467 "time or the client closed the connection.");
2469 * Get the csp in a mostly vergin state again.
2470 * XXX: Should be done elsewhere.
2472 csp->content_type = 0;
2473 csp->content_length = 0;
2474 csp->expected_content_length = 0;
2475 csp->expected_client_content_length = 0;
2476 list_remove_all(csp->headers);
2477 freez(csp->iob->buf);
2478 memset(csp->iob, 0, sizeof(csp->iob));
2479 freez(csp->error_message);
2480 free_http_request(csp->http);
2481 destroy_list(csp->headers);
2482 destroy_list(csp->tags);
2483 free_current_action(csp->action);
2484 if (NULL != csp->fwd)
2486 unload_forward_spec(csp->fwd);
2490 /* XXX: Store per-connection flags someplace else. */
2491 csp->flags = CSP_FLAG_ACTIVE | (csp->flags & CSP_FLAG_TOGGLED_ON);
2495 log_error(LOG_LEVEL_CONNECT,
2496 "No additional client request received in time.");
2497 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
2498 && (socket_is_still_usable(csp->sfd)))
2500 remember_connection(csp, forward_url(csp, csp->http));
2501 csp->sfd = JB_INVALID_SOCKET;
2502 close_socket(csp->cfd);
2503 csp->cfd = JB_INVALID_SOCKET;
2504 privoxy_mutex_lock(&connection_reuse_mutex);
2505 if (!monitor_thread_running)
2507 monitor_thread_running = 1;
2508 privoxy_mutex_unlock(&connection_reuse_mutex);
2509 wait_for_alive_connections();
2510 privoxy_mutex_lock(&connection_reuse_mutex);
2511 monitor_thread_running = 0;
2513 privoxy_mutex_unlock(&connection_reuse_mutex);
2518 else if (csp->sfd != JB_INVALID_SOCKET)
2520 log_error(LOG_LEVEL_CONNECT,
2521 "The connection on server socket %d to %s isn't reusable. "
2522 "Closing.", csp->sfd, csp->server_connection.host);
2524 } while (continue_chatting);
2526 mark_connection_closed(&csp->server_connection);
2529 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2531 if (csp->sfd != JB_INVALID_SOCKET)
2533 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2534 forget_connection(csp->sfd);
2535 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2536 close_socket(csp->sfd);
2539 if (csp->cfd != JB_INVALID_SOCKET)
2541 close_socket(csp->cfd);
2544 csp->flags &= ~CSP_FLAG_ACTIVE;
2550 /*********************************************************************
2552 * Function : server_thread
2554 * Description : We only exist to call `serve' in a threaded environment.
2557 * 1 : data = Current client state (buffers, headers, etc...)
2559 * Returns : Always 0.
2561 *********************************************************************/
2562 static int32 server_thread(void *data)
2564 serve((struct client_state *) data);
2571 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2572 /*********************************************************************
2576 * Description : Print usage info & exit.
2578 * Parameters : Pointer to argv[0] for identifying ourselves
2582 *********************************************************************/
2583 static void usage(const char *myname)
2585 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
2589 #endif /* defined(unix) */
2592 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
2593 #endif /* defined(unix) */
2594 "[--version] [configfile]\n"
2595 "Aborting\n", myname);
2600 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
2603 #ifdef MUTEX_LOCKS_AVAILABLE
2604 /*********************************************************************
2606 * Function : privoxy_mutex_lock
2608 * Description : Locks a mutex.
2611 * 1 : mutex = The mutex to lock.
2613 * Returns : Void. May exit in case of errors.
2615 *********************************************************************/
2616 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
2618 #ifdef FEATURE_PTHREAD
2619 int err = pthread_mutex_lock(mutex);
2622 if (mutex != &log_mutex)
2624 log_error(LOG_LEVEL_FATAL,
2625 "Mutex locking failed: %s.\n", strerror(err));
2630 EnterCriticalSection(mutex);
2631 #endif /* def FEATURE_PTHREAD */
2635 /*********************************************************************
2637 * Function : privoxy_mutex_unlock
2639 * Description : Unlocks a mutex.
2642 * 1 : mutex = The mutex to unlock.
2644 * Returns : Void. May exit in case of errors.
2646 *********************************************************************/
2647 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
2649 #ifdef FEATURE_PTHREAD
2650 int err = pthread_mutex_unlock(mutex);
2653 if (mutex != &log_mutex)
2655 log_error(LOG_LEVEL_FATAL,
2656 "Mutex unlocking failed: %s.\n", strerror(err));
2661 LeaveCriticalSection(mutex);
2662 #endif /* def FEATURE_PTHREAD */
2666 /*********************************************************************
2668 * Function : privoxy_mutex_init
2670 * Description : Prepares a mutex.
2673 * 1 : mutex = The mutex to initialize.
2675 * Returns : Void. May exit in case of errors.
2677 *********************************************************************/
2678 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
2680 #ifdef FEATURE_PTHREAD
2681 int err = pthread_mutex_init(mutex, 0);
2684 printf("Fatal error. Mutex initialization failed: %s.\n",
2689 InitializeCriticalSection(mutex);
2690 #endif /* def FEATURE_PTHREAD */
2692 #endif /* def MUTEX_LOCKS_AVAILABLE */
2694 /*********************************************************************
2696 * Function : initialize_mutexes
2698 * Description : Prepares mutexes if mutex support is available.
2702 * Returns : Void, exits in case of errors.
2704 *********************************************************************/
2705 static void initialize_mutexes(void)
2707 #ifdef MUTEX_LOCKS_AVAILABLE
2709 * Prepare global mutex semaphores
2711 privoxy_mutex_init(&log_mutex);
2712 privoxy_mutex_init(&log_init_mutex);
2713 privoxy_mutex_init(&connection_reuse_mutex);
2716 * XXX: The assumptions below are a bit naive
2717 * and can cause locks that aren't necessary.
2719 * For example older FreeBSD versions (< 6.x?)
2720 * have no gethostbyname_r, but gethostbyname is
2723 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
2724 privoxy_mutex_init(&resolver_mutex);
2725 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
2727 * XXX: should we use a single mutex for
2728 * localtime() and gmtime() as well?
2730 #ifndef HAVE_GMTIME_R
2731 privoxy_mutex_init(&gmtime_mutex);
2732 #endif /* ndef HAVE_GMTIME_R */
2734 #ifndef HAVE_LOCALTIME_R
2735 privoxy_mutex_init(&localtime_mutex);
2736 #endif /* ndef HAVE_GMTIME_R */
2739 privoxy_mutex_init(&rand_mutex);
2740 #endif /* ndef HAVE_RANDOM */
2741 #endif /* def MUTEX_LOCKS_AVAILABLE */
2745 /*********************************************************************
2749 * Description : Load the config file and start the listen loop.
2750 * This function is a lot more *sane* with the `load_config'
2751 * and `listen_loop' functions; although it stills does
2752 * a *little* too much for my taste.
2755 * 1 : argc = Number of parameters (including $0).
2756 * 2 : argv = Array of (char *)'s to the parameters.
2758 * Returns : 1 if : can't open config file, unrecognized directive,
2759 * stats requested in multi-thread mode, can't open the
2760 * log file, can't open the jar file, listen port is invalid,
2761 * any load fails, and can't bind port.
2763 * Else main never returns, the process must be signaled
2764 * to terminate execution. Or, on Windows, use the
2765 * "File", "Exit" menu option.
2767 *********************************************************************/
2769 int real_main(int argc, const char *argv[])
2771 int main(int argc, const char *argv[])
2775 unsigned int random_seed;
2777 struct passwd *pw = NULL;
2778 struct group *grp = NULL;
2781 char *pre_chroot_nslookup_to_load_resolver = NULL;
2788 #if !defined(_WIN32)
2795 /* Prepare mutexes if supported and necessary. */
2796 initialize_mutexes();
2798 /* Enable logging until further notice. */
2802 * Parse the command line arguments
2804 * XXX: simply printing usage information in case of
2805 * invalid arguments isn't particularly user friendly.
2807 while (++argc_pos < argc)
2810 /* Check to see if the service must be installed or uninstalled */
2811 if (strncmp(argv[argc_pos], "--install", 9) == 0)
2813 const char *pName = argv[argc_pos] + 9;
2816 exit( (install_service(pName)) ? 0 : 1 );
2818 else if (strncmp(argv[argc_pos], "--uninstall", + 11) == 0)
2820 const char *pName = argv[argc_pos] + 11;
2823 exit((uninstall_service(pName)) ? 0 : 1);
2825 else if (strcmp(argv[argc_pos], "--service" ) == 0)
2827 bRunAsService = TRUE;
2828 w32_set_service_cwd();
2829 atexit(w32_service_exit_notify);
2832 #endif /* defined(_WIN32) */
2835 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
2837 if (strcmp(argv[argc_pos], "--help") == 0)
2842 else if(strcmp(argv[argc_pos], "--version") == 0)
2844 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
2850 else if (strcmp(argv[argc_pos], "--no-daemon" ) == 0)
2852 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
2856 else if (strcmp(argv[argc_pos], "--pidfile" ) == 0)
2858 if (++argc_pos == argc) usage(argv[0]);
2859 pidfile = strdup(argv[argc_pos]);
2862 else if (strcmp(argv[argc_pos], "--user" ) == 0)
2864 if (++argc_pos == argc) usage(argv[argc_pos]);
2866 if ((NULL != (p = strchr(argv[argc_pos], '.'))) && *(p + 1) != '0')
2869 if (NULL == (grp = getgrnam(p)))
2871 log_error(LOG_LEVEL_FATAL, "Group %s not found.", p);
2875 if (NULL == (pw = getpwnam(argv[argc_pos])))
2877 log_error(LOG_LEVEL_FATAL, "User %s not found.", argv[argc_pos]);
2880 if (p != NULL) *--p = '\0';
2883 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup" ) == 0)
2885 if (++argc_pos == argc) usage(argv[0]);
2886 pre_chroot_nslookup_to_load_resolver = strdup(argv[argc_pos]);
2889 else if (strcmp(argv[argc_pos], "--chroot" ) == 0)
2893 #endif /* defined(unix) */
2895 else if (argc_pos + 1 != argc)
2898 * This is neither the last command line
2899 * option, nor was it recognized before,
2900 * therefore it must be invalid.
2906 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
2908 configfile = argv[argc_pos];
2911 } /* -END- while (more arguments) */
2913 show_version(Argv[0]);
2916 if ( *configfile != '/' )
2918 char cwd[BUFFER_SIZE];
2920 size_t abs_file_size;
2922 /* make config-filename absolute here */
2923 if (NULL == getcwd(cwd, sizeof(cwd)))
2925 perror("failed to get current working directory");
2930 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
2931 basedir = strdup(cwd);
2933 if (NULL == basedir ||
2934 NULL == (abs_file = malloc(abs_file_size)))
2936 perror("malloc failed");
2939 strlcpy(abs_file, basedir, abs_file_size);
2940 strlcat(abs_file, "/", abs_file_size );
2941 strlcat(abs_file, configfile, abs_file_size);
2942 configfile = abs_file;
2944 #endif /* defined unix */
2948 clients->next = NULL;
2950 /* XXX: factor out initialising after the next stable release. */
2953 #elif defined(_WIN32)
2957 random_seed = (unsigned int)time(NULL);
2959 srandom(random_seed);
2962 #endif /* ifdef HAVE_RANDOM */
2965 * Unix signal handling
2967 * Catch the abort, interrupt and terminate signals for a graceful exit
2968 * Catch the hangup signal so the errlog can be reopened.
2969 * Ignore the broken pipe signals (FIXME: Why?)
2971 #if !defined(_WIN32) && !defined(__OS2__) && !defined(AMIGA)
2974 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP, 0 };
2975 const int ignored_signals[] = { SIGPIPE, 0 };
2977 for (idx = 0; catched_signals[idx] != 0; idx++)
2979 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
2980 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
2982 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
2983 #endif /* ifdef sun */
2985 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
2989 for (idx = 0; ignored_signals[idx] != 0; idx++)
2991 if (signal(ignored_signals[idx], SIG_IGN) == SIG_ERR)
2993 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for signal %d: %E", ignored_signals[idx]);
2998 #else /* ifdef _WIN32 */
2999 # ifdef _WIN_CONSOLE
3001 * We *are* in a windows console app.
3002 * Print a verbose messages about FAQ's and such
3004 printf("%s", win32_blurb);
3005 # endif /* def _WIN_CONSOLE */
3006 #endif /* def _WIN32 */
3009 /* Initialize the CGI subsystem */
3010 cgi_init_error_messages();
3013 * If runnig on unix and without the --nodaemon
3014 * option, become a daemon. I.e. fork, detach
3015 * from tty and get process group leadership
3028 if ( pid < 0 ) /* error */
3033 else if ( pid != 0 ) /* parent */
3038 * must check for errors
3039 * child died due to missing files aso
3042 wpid = waitpid( pid, &status, WNOHANG );
3051 /* Should be more portable, but not as well tested */
3056 #else /* ndef __FreeBSD__ */
3058 #endif /* ndef __FreeBSD__ */
3059 fd = open("/dev/tty", O_RDONLY);
3062 /* no error check here */
3063 ioctl( fd, TIOCNOTTY,0 );
3068 * stderr (fd 2) will be closed later on,
3069 * when the config file has been parsed.
3076 } /* -END- if (!no_daemon) */
3079 * As soon as we have written the PID file, we can switch
3080 * to the user and group ID indicated by the --user option
3086 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
3088 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
3092 if (setgroups(1, &grp->gr_gid))
3094 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
3097 else if (initgroups(pw->pw_name, pw->pw_gid))
3099 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
3105 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
3107 /* Read the time zone file from /etc before doing chroot. */
3109 if (NULL != pre_chroot_nslookup_to_load_resolver
3110 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
3112 /* Initialize resolver library. */
3113 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
3115 if (chroot(pw->pw_dir) < 0)
3117 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
3121 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
3124 if (setuid(pw->pw_uid))
3126 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
3130 char putenv_dummy[64];
3132 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
3133 if (putenv(putenv_dummy) != 0)
3135 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
3138 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
3139 if (putenv(putenv_dummy) != 0)
3141 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
3147 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
3150 #endif /* defined unix */
3153 /* This will be FALSE unless the command line specified --service
3157 /* Yup, so now we must attempt to establish a connection
3158 * with the service dispatcher. This will only work if this
3159 * process was launched by the service control manager to
3160 * actually run as a service. If this isn't the case, i've
3161 * known it take around 30 seconds or so for the call to return.
3164 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
3165 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
3167 /* Service has run, and at this point is now being stopped, so just return */
3172 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
3174 /* An error occurred. Usually it's because --service was wrongly specified
3175 * and we were unable to connect to the Service Control Dispatcher because
3176 * it wasn't expecting us and is therefore not listening.
3178 * For now, just continue below to call the listen_loop function.
3181 #endif /* def _WIN32 */
3191 /*********************************************************************
3193 * Function : bind_port_helper
3195 * Description : Bind the listen port. Handles logging, and aborts
3199 * 1 : config = Privoxy configuration. Specifies port
3202 * Returns : Port that was opened.
3204 *********************************************************************/
3205 static jb_socket bind_port_helper(struct configuration_spec * config)
3210 if (config->haddr == NULL)
3212 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
3217 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
3218 config->hport, config->haddr);
3221 result = bind_port(config->haddr, config->hport, &bfd);
3228 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3229 "There may be another Privoxy or some other "
3230 "proxy running on port %d",
3231 (NULL != config->haddr) ? config->haddr : "INADDR_ANY",
3232 config->hport, config->hport);
3235 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: "
3236 "The hostname is not resolvable",
3237 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3240 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
3241 (NULL != config->haddr) ? config->haddr : "INADDR_ANY", config->hport);
3244 /* shouldn't get here */
3245 return JB_INVALID_SOCKET;
3248 config->need_bind = 0;
3255 /* Without this simple workaround we get this compiler warning from _beginthread
3256 * warning C4028: formal parameter 1 different from declaration
3258 void w32_service_listen_loop(void *p)
3262 #endif /* def _WIN32 */
3265 /*********************************************************************
3267 * Function : listen_loop
3269 * Description : bind the listen port and enter a "FOREVER" listening loop.
3275 *********************************************************************/
3276 static void listen_loop(void)
3278 struct client_state *csp = NULL;
3280 struct configuration_spec *config;
3281 unsigned int active_threads = 0;
3283 config = load_config();
3285 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3287 * XXX: Should be relocated once it no
3288 * longer needs to emit log messages.
3290 initialize_reusable_connections();
3291 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3293 bfd = bind_port_helper(config);
3295 #ifdef FEATURE_GRACEFUL_TERMINATION
3296 while (!g_terminate)
3301 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) && !defined(__OS2__)
3302 while (waitpid(-1, NULL, WNOHANG) > 0)
3304 /* zombie children */
3306 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(AMIGA) */
3309 * Free data that was used by died threads
3311 active_threads = sweep();
3315 * Re-open the errlog after HUP signal
3317 if (received_hup_signal)
3319 if (NULL != config->logfile)
3321 init_error_log(Argv[0], config->logfile);
3323 received_hup_signal = 0;
3327 if ( NULL == (csp = (struct client_state *) zalloc(sizeof(*csp))) )
3329 log_error(LOG_LEVEL_FATAL, "malloc(%d) for csp failed: %E", sizeof(*csp));
3333 csp->flags |= CSP_FLAG_ACTIVE;
3334 csp->sfd = JB_INVALID_SOCKET;
3336 csp->config = config = load_config();
3338 if ( config->need_bind )
3341 * Since we were listening to the "old port", we will not see
3342 * a "listen" param change until the next request. So, at
3343 * least 1 more request must be made for us to find the new
3344 * setting. I am simply closing the old socket and binding the
3347 * Which-ever is correct, we will serve 1 more page via the
3348 * old settings. This should probably be a "show-proxy-args"
3349 * request. This should not be a so common of an operation
3350 * that this will hurt people's feelings.
3355 bfd = bind_port_helper(config);
3358 log_error(LOG_LEVEL_CONNECT, "Listening for new connections ... ");
3360 if (!accept_connection(csp, bfd))
3362 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
3375 log_error(LOG_LEVEL_CONNECT, "accepted connection from %s", csp->ip_addr_str);
3378 #ifdef FEATURE_TOGGLE
3379 if (global_toggle_state)
3380 #endif /* def FEATURE_TOGGLE */
3382 csp->flags |= CSP_FLAG_TOGGLED_ON;
3385 if (run_loader(csp))
3387 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
3388 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3392 if (block_acl(NULL,csp))
3394 log_error(LOG_LEVEL_CONNECT, "Connection from %s dropped due to ACL", csp->ip_addr_str);
3395 close_socket(csp->cfd);
3396 freez(csp->ip_addr_str);
3400 #endif /* def FEATURE_ACL */
3402 if ((0 != config->max_client_connections)
3403 && (active_threads >= config->max_client_connections))
3405 log_error(LOG_LEVEL_CONNECT,
3406 "Rejecting connection from %s. Maximum number of connections reached.",
3408 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
3409 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
3410 close_socket(csp->cfd);
3411 freez(csp->ip_addr_str);
3416 /* add it to the list of clients */
3417 csp->next = clients->next;
3418 clients->next = csp;
3420 if (config->multi_threaded)
3424 /* this is a switch () statment in the C preprocessor - ugh */
3425 #undef SELECTED_ONE_OPTION
3427 /* Use Pthreads in preference to native code */
3428 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
3429 #define SELECTED_ONE_OPTION
3431 pthread_t the_thread;
3432 pthread_attr_t attrs;
3434 pthread_attr_init(&attrs);
3435 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
3436 errno = pthread_create(&the_thread, &attrs,
3437 (void * (*)(void *))serve, csp);
3438 child_id = errno ? -1 : 0;
3439 pthread_attr_destroy(&attrs);
3443 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
3444 #define SELECTED_ONE_OPTION
3445 child_id = _beginthread(
3446 (void (*)(void *))serve,
3451 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
3452 #define SELECTED_ONE_OPTION
3453 child_id = _beginthread(
3454 (void(* _Optlink)(void*))serve,
3460 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
3461 #define SELECTED_ONE_OPTION
3463 thread_id tid = spawn_thread
3464 (server_thread, "server", B_NORMAL_PRIORITY, csp);
3466 if ((tid >= 0) && (resume_thread(tid) == B_OK))
3468 child_id = (int) tid;
3477 #if defined(AMIGA) && !defined(SELECTED_ONE_OPTION)
3478 #define SELECTED_ONE_OPTION
3479 csp->cfd = ReleaseSocket(csp->cfd, -1);
3482 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3483 NP_Output, Output(),
3484 NP_CloseOutput, FALSE,
3485 NP_Name, (ULONG)"privoxy child",
3489 child_id = (int)CreateNewProcTags(NP_Entry, (ULONG)server_thread,
3490 NP_Output, Output(),
3491 NP_CloseOutput, FALSE,
3492 NP_Name, (ULONG)"privoxy child",
3493 NP_StackSize, 200*1024,
3499 ((struct Task *)child_id)->tc_UserData = csp;
3500 Signal((struct Task *)child_id, SIGF_SINGLE);
3505 #if !defined(SELECTED_ONE_OPTION)
3508 /* This block is only needed when using fork().
3509 * When using threads, the server thread was
3510 * created and run by the call to _beginthread().
3512 if (child_id == 0) /* child */
3515 #ifdef FEATURE_TOGGLE
3516 int inherited_toggle_state = global_toggle_state;
3517 #endif /* def FEATURE_TOGGLE */
3522 * If we've been toggled or we've blocked the request, tell Mom
3525 #ifdef FEATURE_TOGGLE
3526 if (inherited_toggle_state != global_toggle_state)
3528 rc |= RC_FLAG_TOGGLED;
3530 #endif /* def FEATURE_TOGGLE */
3532 #ifdef FEATURE_STATISTICS
3533 if (csp->flags & CSP_FLAG_REJECTED)
3535 rc |= RC_FLAG_BLOCKED;
3537 #endif /* ndef FEATURE_STATISTICS */
3541 else if (child_id > 0) /* parent */
3543 /* in a fork()'d environment, the parent's
3544 * copy of the client socket and the CSP
3548 #if !defined(_WIN32) && !defined(__CYGWIN__)
3550 wait( &child_status );
3553 * Evaluate child's return code: If the child has
3554 * - been toggled, toggle ourselves
3555 * - blocked its request, bump up the stats counter
3558 #ifdef FEATURE_TOGGLE
3559 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
3561 global_toggle_state = !global_toggle_state;
3563 #endif /* def FEATURE_TOGGLE */
3565 #ifdef FEATURE_STATISTICS
3567 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
3571 #endif /* def FEATURE_STATISTICS */
3573 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
3574 close_socket(csp->cfd);
3575 csp->flags &= ~CSP_FLAG_ACTIVE;
3579 #undef SELECTED_ONE_OPTION
3580 /* end of cpp switch () */
3585 * Spawning the child failed, assume it's because
3586 * there are too many children running already.
3587 * XXX: If you assume ...
3589 log_error(LOG_LEVEL_ERROR,
3590 "Unable to take any additional connections: %E");
3591 write_socket(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
3592 strlen(TOO_MANY_CONNECTIONS_RESPONSE));
3593 close_socket(csp->cfd);
3594 csp->flags &= ~CSP_FLAG_ACTIVE;
3603 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
3605 /* Clean up. Aim: free all memory (no leaks) */
3606 #ifdef FEATURE_GRACEFUL_TERMINATION
3608 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
3610 unload_current_config_file();
3611 unload_current_actions_file();
3612 unload_current_re_filterfile();
3613 #ifdef FEATURE_TRUST
3614 unload_current_trust_file();
3617 if (config->multi_threaded)
3624 } while ((clients->next != NULL) && (--i > 0));
3628 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
3639 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
3640 /* Cleanup - remove taskbar icon etc. */
3645 #endif /* FEATURE_GRACEFUL_TERMINATION */