1 /*********************************************************************
3 * File : $Source: /cvsroot/ijbswa/current/jcc.c,v $
5 * Purpose : Main file. Contains main() method, main loop, and
6 * the main connection-handling function.
8 * Copyright : Written by and Copyright (C) 2001-2019 the
9 * Privoxy team. http://www.privoxy.org/
11 * Based on the Internet Junkbuster originally written
12 * by and Copyright (C) 1997 Anonymous Coders and
13 * Junkbusters Corporation. http://www.junkbusters.com
15 * This program is free software; you can redistribute it
16 * and/or modify it under the terms of the GNU General
17 * Public License as published by the Free Software
18 * Foundation; either version 2 of the License, or (at
19 * your option) any later version.
21 * This program is distributed in the hope that it will
22 * be useful, but WITHOUT ANY WARRANTY; without even the
23 * implied warranty of MERCHANTABILITY or FITNESS FOR A
24 * PARTICULAR PURPOSE. See the GNU General Public
25 * License for more details.
27 * The GNU General Public License should be included with
28 * this file. If not, you can view it at
29 * http://www.gnu.org/copyleft/gpl.html
30 * or write to the Free Software Foundation, Inc., 59
31 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
33 *********************************************************************/
39 #include <sys/types.h>
48 # ifndef FEATURE_PTHREAD
52 # include <winsock2.h>
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 */
102 #endif /* def __GLIBC__ */
107 #warning poll() appears to be unavailable. Your platform will become unsupported in the future.
108 #endif /* HAVE_POLL */
115 #ifdef FEATURE_HTTPS_FILTERING
121 #include "miscutil.h"
123 #include "jbsockets.h"
128 #include "urlmatch.h"
129 #ifdef FEATURE_CLIENT_TAGS
130 #include "client-tags.h"
134 struct client_states clients[1];
135 struct file_list files[1];
137 #ifdef FEATURE_STATISTICS
138 int urls_read = 0; /* total nr of urls read inc rejected */
139 int urls_rejected = 0; /* total nr of urls rejected */
140 #endif /* def FEATURE_STATISTICS */
142 #ifdef FEATURE_GRACEFUL_TERMINATION
146 #if !defined(_WIN32) && !defined(__OS2__)
147 static void sig_handler(int the_signal);
149 static int client_protocol_is_unsupported(const struct client_state *csp, char *req);
150 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
151 static jb_err get_server_headers(struct client_state *csp);
152 static const char *crunch_reason(const struct http_response *rsp);
153 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
154 static char *get_request_line(struct client_state *csp);
155 static jb_err receive_client_request(struct client_state *csp);
156 static jb_err parse_client_request(struct client_state *csp);
157 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
158 static jb_err change_request_destination(struct client_state *csp);
159 static void chat(struct client_state *csp);
160 static void serve(struct client_state *csp);
161 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
162 static void usage(const char *myname);
164 static void initialize_mutexes(void);
165 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
166 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
167 static void close_ports_helper(jb_socket sockets[]);
168 static void listen_loop(void);
169 static void serve(struct client_state *csp);
172 static int32 server_thread(void *data);
173 #endif /* def __BEOS__ */
176 #define sleep(N) Sleep(((N) * 1000))
180 #define sleep(N) DosSleep(((N) * 100))
184 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
185 void show_fuzz_usage(const char *name);
188 #ifdef MUTEX_LOCKS_AVAILABLE
190 * XXX: Does the locking stuff really belong in this file?
192 privoxy_mutex_t log_mutex;
193 privoxy_mutex_t log_init_mutex;
194 privoxy_mutex_t connection_reuse_mutex;
196 #ifdef LIMIT_MUTEX_NUMBER
197 privoxy_mutex_t certificates_mutexes[32];
199 privoxy_mutex_t certificates_mutexes[65536];
200 #endif /* LIMIT_MUTEX_NUMBER */
201 privoxy_mutex_t rng_mutex;
203 #ifdef FEATURE_EXTERNAL_FILTERS
204 privoxy_mutex_t external_filter_mutex;
206 #ifdef FEATURE_CLIENT_TAGS
207 privoxy_mutex_t client_tags_mutex;
210 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
211 privoxy_mutex_t resolver_mutex;
212 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
214 #ifndef HAVE_GMTIME_R
215 privoxy_mutex_t gmtime_mutex;
216 #endif /* ndef HAVE_GMTIME_R */
218 #ifndef HAVE_LOCALTIME_R
219 privoxy_mutex_t localtime_mutex;
220 #endif /* ndef HAVE_GMTIME_R */
222 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
223 privoxy_mutex_t rand_mutex;
224 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
226 #endif /* def MUTEX_LOCKS_AVAILABLE */
229 const char *basedir = NULL;
230 const char *pidfile = NULL;
231 static int received_hup_signal = 0;
232 #endif /* defined unix */
234 /* HTTP snipplets. */
235 static const char CSUCCEED[] =
236 "HTTP/1.1 200 Connection established\r\n\r\n";
238 static const char CHEADER[] =
239 "HTTP/1.1 400 Invalid header received from client\r\n"
240 "Content-Type: text/plain\r\n"
241 "Connection: close\r\n\r\n"
242 "Invalid header received from client.\r\n";
244 static const char FTP_RESPONSE[] =
245 "HTTP/1.1 400 Invalid request received from client\r\n"
246 "Content-Type: text/plain\r\n"
247 "Connection: close\r\n\r\n"
248 "Invalid request. Privoxy doesn't support FTP.\r\n";
250 static const char GOPHER_RESPONSE[] =
251 "HTTP/1.1 400 Invalid request received from client\r\n"
252 "Content-Type: text/plain\r\n"
253 "Connection: close\r\n\r\n"
254 "Invalid request. Privoxy doesn't support gopher.\r\n";
256 /* XXX: should be a template */
257 static const char MISSING_DESTINATION_RESPONSE[] =
258 "HTTP/1.1 400 Bad request received from client\r\n"
259 "Content-Type: text/plain\r\n"
260 "Connection: close\r\n\r\n"
261 "Bad request. Privoxy was unable to extract the destination.\r\n";
263 /* XXX: should be a template */
264 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
265 "HTTP/1.1 502 Server or forwarder response invalid\r\n"
266 "Content-Type: text/plain\r\n"
267 "Connection: close\r\n\r\n"
268 "Bad response. The server or forwarder response doesn't look like HTTP.\r\n";
270 /* XXX: should be a template */
271 static const char MESSED_UP_REQUEST_RESPONSE[] =
272 "HTTP/1.1 400 Malformed request after rewriting\r\n"
273 "Content-Type: text/plain\r\n"
274 "Connection: close\r\n\r\n"
275 "Bad request. Messed up with header filters.\r\n";
277 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
278 "HTTP/1.1 503 Too many open connections\r\n"
279 "Content-Type: text/plain\r\n"
280 "Connection: close\r\n\r\n"
281 "Maximum number of open connections reached.\r\n";
283 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
284 "HTTP/1.1 504 Connection timeout\r\n"
285 "Content-Type: text/plain\r\n"
286 "Connection: close\r\n\r\n"
287 "The connection timed out because the client request didn't arrive in time.\r\n";
289 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
290 "HTTP/1.1 400 Failed reading client body\r\n"
291 "Content-Type: text/plain\r\n"
292 "Connection: close\r\n\r\n"
293 "Failed parsing or buffering the chunk-encoded client body.\r\n";
295 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
296 "HTTP/1.1 417 Expecting too much\r\n"
297 "Content-Type: text/plain\r\n"
298 "Connection: close\r\n\r\n"
299 "Privoxy detected an unsupported Expect header value.\r\n";
301 /* A function to crunch a response */
302 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
304 /* Crunch function flags */
305 #define CF_NO_FLAGS 0
306 /* Cruncher applies to forced requests as well */
307 #define CF_IGNORE_FORCE 1
308 /* Crunched requests are counted for the block statistics */
309 #define CF_COUNT_AS_REJECT 2
311 /* A crunch function and its flags */
314 const crunch_func_ptr cruncher;
318 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
320 /* Complete list of cruncher functions */
321 static const struct cruncher crunchers_all[] = {
322 { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
323 { block_url, CF_COUNT_AS_REJECT },
325 { trust_url, CF_COUNT_AS_REJECT },
326 #endif /* def FEATURE_TRUST */
327 { redirect_url, CF_NO_FLAGS },
328 { dispatch_cgi, CF_IGNORE_FORCE},
332 /* Light version, used after tags are applied */
333 static const struct cruncher crunchers_light[] = {
334 { block_url, CF_COUNT_AS_REJECT },
335 { redirect_url, CF_NO_FLAGS },
341 * XXX: Don't we really mean
347 #if !defined(_WIN32) && !defined(__OS2__)
348 /*********************************************************************
350 * Function : sig_handler
352 * Description : Signal handler for different signals.
353 * Exit gracefully on TERM and INT
354 * or set a flag that will cause the errlog
355 * to be reopened by the main thread on HUP.
358 * 1 : the_signal = the signal cause this function to call
362 *********************************************************************/
363 static void sig_handler(int the_signal)
369 log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
381 received_hup_signal = 1;
387 * We shouldn't be here, unless we catch signals
388 * in main() that we can't handle here!
390 log_error(LOG_LEVEL_FATAL, "sig_handler: exiting on unexpected signal %d", the_signal);
398 /*********************************************************************
400 * Function : get_write_delay
402 * Description : Parse the delay-response parameter.
405 * 1 : csp = Current client state (buffers, headers, etc...)
407 * Returns : Number of milliseconds to delay writes.
409 *********************************************************************/
410 static unsigned int get_write_delay(const struct client_state *csp)
416 if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
420 newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
422 delay = (unsigned)strtol(newval, &endptr, 0);
425 log_error(LOG_LEVEL_FATAL,
426 "Invalid delay-response{} parameter: '%s'", newval);
434 /*********************************************************************
436 * Function : client_protocol_is_unsupported
438 * Description : Checks if the client used a known unsupported
439 * protocol and deals with it by sending an error
443 * 1 : csp = Current client state (buffers, headers, etc...)
444 * 2 : req = the first request line send by the client
446 * Returns : TRUE if an error response has been generated, or
447 * FALSE if the request doesn't look invalid.
449 *********************************************************************/
450 static int client_protocol_is_unsupported(const struct client_state *csp, char *req)
453 * If it's a FTP or gopher request, we don't support it.
455 * These checks are better than nothing, but they might
456 * not work in all configurations and some clients might
457 * have problems digesting the answer.
459 * They should, however, never cause more problems than
460 * Privoxy's old behaviour (returning the misleading HTML
463 * "Could not resolve http://(ftp|gopher)://example.org").
465 if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
467 const char *response = NULL;
468 const char *protocol = NULL;
470 if (!strncmpic(req, "GET ftp://", 10))
472 response = FTP_RESPONSE;
477 response = GOPHER_RESPONSE;
480 log_error(LOG_LEVEL_ERROR,
481 "%s tried to use Privoxy as %s proxy: %s",
482 csp->ip_addr_str, protocol, req);
483 log_error(LOG_LEVEL_CLF,
484 "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
486 write_socket_delayed(csp->cfd, response, strlen(response),
487 get_write_delay(csp));
496 /*********************************************************************
498 * Function : client_has_unsupported_expectations
500 * Description : Checks if the client used an unsupported expectation
501 * in which case an error message is delivered.
504 * 1 : csp = Current client state (buffers, headers, etc...)
506 * Returns : TRUE if an error response has been generated, or
507 * FALSE if the request doesn't look invalid.
509 *********************************************************************/
510 static int client_has_unsupported_expectations(const struct client_state *csp)
512 if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
514 log_error(LOG_LEVEL_ERROR,
515 "Rejecting request from client %s with unsupported Expect header value",
517 log_error(LOG_LEVEL_CLF,
518 "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
519 write_socket_delayed(csp->cfd,
520 UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
521 strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
522 get_write_delay(csp));
532 /*********************************************************************
534 * Function : get_request_destination_elsewhere
536 * Description : If the client's request was redirected into
537 * Privoxy without the client's knowledge,
538 * the request line lacks the destination host.
540 * This function tries to get it elsewhere,
541 * provided accept-intercepted-requests is enabled.
543 * "Elsewhere" currently only means "Host: header",
544 * but in the future we may ask the redirecting
545 * packet filter to look the destination up.
547 * If the destination stays unknown, an error
548 * response is send to the client and headers
549 * are freed so that chat() can return directly.
552 * 1 : csp = Current client state (buffers, headers, etc...)
553 * 2 : headers = a header list
555 * Returns : JB_ERR_OK if the destination is now known, or
556 * JB_ERR_PARSE if it isn't.
558 *********************************************************************/
559 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
563 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
565 log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
566 " Privoxy isn't configured to accept intercepted requests.",
567 csp->ip_addr_str, csp->http->cmd);
568 /* XXX: Use correct size */
569 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
570 csp->ip_addr_str, csp->http->cmd);
572 write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
573 get_write_delay(csp));
574 destroy_list(headers);
578 else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
580 #ifndef FEATURE_EXTENDED_HOST_PATTERNS
581 /* Split the domain we just got for pattern matching */
582 init_domain_components(csp->http);
589 /* We can't work without destination. Go spread the news.*/
591 req = list_to_text(headers);
593 /* XXX: Use correct size */
594 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
595 csp->ip_addr_str, csp->http->cmd);
596 log_error(LOG_LEVEL_ERROR,
597 "Privoxy was unable to get the destination for %s's request:\n%s\n%s",
598 csp->ip_addr_str, csp->http->cmd, req);
601 write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
602 strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
603 destroy_list(headers);
608 * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
609 * to get the destination IP address, use it as host directly
610 * or do a reverse DNS lookup first.
615 /*********************************************************************
617 * Function : get_server_headers
619 * Description : Parses server headers in iob and fills them
620 * into csp->headers so that they can later be
624 * 1 : csp = Current client state (buffers, headers, etc...)
626 * Returns : JB_ERR_OK if everything went fine, or
627 * JB_ERR_PARSE if the headers were incomplete.
629 *********************************************************************/
630 static jb_err get_server_headers(struct client_state *csp)
632 int continue_hack_in_da_house = 0;
635 while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
640 * continue hack in da house. Ignore the ending of
641 * this head and continue enlisting header lines.
642 * The reason is described below.
644 enlist(csp->headers, "");
645 continue_hack_in_da_house = 0;
648 else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
651 * It's a bodyless continue response, don't
652 * stop header parsing after reaching its end.
654 * As a result Privoxy will concatenate the
655 * next response's head and parse and deliver
656 * the headers as if they belonged to one request.
658 * The client will separate them because of the
659 * empty line between them.
661 * XXX: What we're doing here is clearly against
662 * the intended purpose of the continue header,
663 * and under some conditions (HTTP/1.0 client request)
664 * it's a standard violation.
666 * Anyway, "sort of against the spec" is preferable
667 * to "always getting confused by Continue responses"
668 * (Privoxy's behaviour before this hack was added)
670 log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
671 continue_hack_in_da_house = 1;
673 else if (*header == '\0')
676 * If the header is empty, but the Continue hack
677 * isn't active, we can assume that we reached the
678 * end of the buffer before we hit the end of the
681 * Inform the caller an let it decide how to handle it.
686 if (JB_ERR_MEMORY == enlist(csp->headers, header))
689 * XXX: Should we quit the request and return a
690 * out of memory error page instead?
692 log_error(LOG_LEVEL_ERROR,
693 "Out of memory while enlisting server headers. %s lost.",
703 /*********************************************************************
705 * Function : crunch_reason
707 * Description : Translates the crunch reason code into a string.
710 * 1 : rsp = a http_response
712 * Returns : A string with the crunch reason or an error description.
714 *********************************************************************/
715 static const char *crunch_reason(const struct http_response *rsp)
717 char * reason = NULL;
722 return "Internal error while searching for crunch reason";
725 switch (rsp->crunch_reason)
728 reason = "Unsupported HTTP feature";
734 reason = "Untrusted";
737 reason = "Redirected";
743 reason = "DNS failure";
745 case FORWARDING_FAILED:
746 reason = "Forwarding failed";
749 reason = "Connection failure";
752 reason = "Out of memory (may mask other reasons)";
754 case CONNECTION_TIMEOUT:
755 reason = "Connection timeout";
758 reason = "No server data received";
761 reason = "No reason recorded";
769 /*********************************************************************
771 * Function : log_applied_actions
773 * Description : Logs the applied actions if LOG_LEVEL_ACTIONS is
777 * 1 : actions = Current action spec to log
781 *********************************************************************/
782 static void log_applied_actions(const struct current_action_spec *actions)
785 * The conversion to text requires lots of memory allocations so
786 * we only do the conversion if the user is actually interested.
788 if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
790 char *actions_as_text = actions_to_line_of_text(actions);
791 log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
792 freez(actions_as_text);
797 /*********************************************************************
799 * Function : send_crunch_response
801 * Description : Delivers already prepared response for
802 * intercepted requests, logs the interception
803 * and frees the response.
806 * 1 : csp = Current client state (buffers, headers, etc...)
807 * 2 : rsp = Fully prepared response. Will be freed on exit.
811 *********************************************************************/
812 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
814 const struct http_request *http = csp->http;
818 assert(rsp->head != NULL);
822 log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
826 * Extract the status code from the actual head
827 * that will be send to the client. It is the only
828 * way to get it right for all requests, including
829 * the fixed ones for out-of-memory problems.
831 * A head starts like this: 'HTTP/1.1 200...'
835 status_code[0] = rsp->head[9];
836 status_code[1] = rsp->head[10];
837 status_code[2] = rsp->head[11];
838 status_code[3] = '\0';
840 /* Log that the request was crunched and why. */
841 log_applied_actions(csp->action);
842 log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
843 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %u",
844 csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
846 /* Write the answer to the client */
847 #ifdef FEATURE_HTTPS_FILTERING
848 if (client_use_ssl(csp))
850 if ((ssl_send_data(&(csp->mbedtls_client_attr.ssl),
851 (const unsigned char *)rsp->head, rsp->head_length) < 0)
852 || (ssl_send_data(&(csp->mbedtls_client_attr.ssl),
853 (const unsigned char *)rsp->body, rsp->content_length) < 0))
855 /* There is nothing we can do about it. */
856 log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
857 "for %s through client socket %d using TLS/SSL",
858 http->url, csp->cfd);
864 if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
865 get_write_delay(csp))
866 || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
867 get_write_delay(csp)))
869 /* There is nothing we can do about it. */
870 log_error(LOG_LEVEL_CONNECT,
871 "Couldn't deliver the error message for %s through client socket %d: %E",
872 http->url, csp->cfd);
876 /* Clean up and return */
877 if (cgi_error_memory() != rsp)
879 free_http_response(rsp);
885 /*********************************************************************
887 * Function : crunch_response_triggered
889 * Description : Checks if the request has to be crunched,
890 * and delivers the crunch response if necessary.
893 * 1 : csp = Current client state (buffers, headers, etc...)
894 * 2 : crunchers = list of cruncher functions to run
896 * Returns : TRUE if the request was answered with a crunch response
899 *********************************************************************/
900 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
902 struct http_response *rsp = NULL;
903 const struct cruncher *c;
906 * If CGI request crunching is disabled,
907 * check the CGI dispatcher out of order to
908 * prevent unintentional blocks or redirects.
910 if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
911 && (NULL != (rsp = dispatch_cgi(csp))))
913 /* Deliver, log and free the interception response. */
914 send_crunch_response(csp, rsp);
915 csp->flags |= CSP_FLAG_CRUNCHED;
919 for (c = crunchers; c->cruncher != NULL; c++)
922 * Check the cruncher if either Privoxy is toggled
923 * on and the request isn't forced, or if the cruncher
924 * applies to forced requests as well.
926 if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
927 !(csp->flags & CSP_FLAG_FORCED)) ||
928 (c->flags & CF_IGNORE_FORCE))
930 rsp = c->cruncher(csp);
933 /* Deliver, log and free the interception response. */
934 send_crunch_response(csp, rsp);
935 csp->flags |= CSP_FLAG_CRUNCHED;
936 #ifdef FEATURE_STATISTICS
937 if (c->flags & CF_COUNT_AS_REJECT)
939 csp->flags |= CSP_FLAG_REJECTED;
941 #endif /* def FEATURE_STATISTICS */
952 /*********************************************************************
954 * Function : build_request_line
956 * Description : Builds the HTTP request line.
958 * If a HTTP forwarder is used it expects the whole URL,
959 * web servers only get the path.
962 * 1 : csp = Current client state (buffers, headers, etc...)
963 * 2 : fwd = The forwarding spec used for the request
964 * XXX: Should use http->fwd instead.
965 * 3 : request_line = The old request line which will be replaced.
967 * Returns : Nothing. Terminates in case of memory problems.
969 *********************************************************************/
970 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
972 struct http_request *http = csp->http;
975 * Downgrade http version from 1.1 to 1.0
976 * if +downgrade action applies.
978 if ((csp->action->flags & ACTION_DOWNGRADE)
979 && (!strcmpic(http->ver, "HTTP/1.1")))
982 http->ver = strdup_or_die("HTTP/1.0");
986 * Rebuild the request line.
988 freez(*request_line);
989 *request_line = strdup(http->gpc);
990 string_append(request_line, " ");
992 if (fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
994 string_append(request_line, http->url);
998 string_append(request_line, http->path);
1000 string_append(request_line, " ");
1001 string_append(request_line, http->ver);
1003 if (*request_line == NULL)
1005 log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1007 log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1011 /*********************************************************************
1013 * Function : change_request_destination
1015 * Description : Parse a (rewritten) request line and regenerate
1016 * the http request data.
1019 * 1 : csp = Current client state (buffers, headers, etc...)
1021 * Returns : Forwards the parse_http_request() return code.
1022 * Terminates in case of memory problems.
1024 *********************************************************************/
1025 static jb_err change_request_destination(struct client_state *csp)
1027 struct http_request *http = csp->http;
1030 log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1031 csp->headers->first->str);
1032 free_http_request(http);
1033 err = parse_http_request(csp->headers->first->str, http);
1034 if (JB_ERR_OK != err)
1036 log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1037 jb_err_to_string(err));
1044 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1045 /*********************************************************************
1047 * Function : server_response_is_complete
1049 * Description : Determines whether we should stop reading
1050 * from the server socket.
1053 * 1 : csp = Current client state (buffers, headers, etc...)
1054 * 2 : content_length = Length of content received so far.
1056 * Returns : TRUE if the response is complete,
1059 *********************************************************************/
1060 static int server_response_is_complete(struct client_state *csp,
1061 unsigned long long content_length)
1063 int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1065 if (!strcmpic(csp->http->gpc, "HEAD"))
1068 * "HEAD" implies no body, we are thus expecting
1069 * no content. XXX: incomplete "list" of methods?
1071 csp->expected_content_length = 0;
1072 content_length_known = TRUE;
1073 csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1076 if (csp->http->status == 204 || csp->http->status == 304)
1079 * Expect no body. XXX: incomplete "list" of status codes?
1081 csp->expected_content_length = 0;
1082 content_length_known = TRUE;
1083 csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1086 return (content_length_known && ((0 == csp->expected_content_length)
1087 || (csp->expected_content_length <= content_length)));
1091 #ifdef FEATURE_CONNECTION_SHARING
1092 /*********************************************************************
1094 * Function : wait_for_alive_connections
1096 * Description : Waits for alive connections to timeout.
1102 *********************************************************************/
1103 static void wait_for_alive_connections(void)
1105 int connections_alive = close_unusable_connections();
1107 while (0 < connections_alive)
1109 log_error(LOG_LEVEL_CONNECT,
1110 "Waiting for %d connections to timeout.",
1113 connections_alive = close_unusable_connections();
1116 log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1119 #endif /* def FEATURE_CONNECTION_SHARING */
1122 /*********************************************************************
1124 * Function : save_connection_destination
1126 * Description : Remembers a connection for reuse later on.
1129 * 1 : sfd = Open socket to remember.
1130 * 2 : http = The destination for the connection.
1131 * 3 : fwd = The forwarder settings used.
1132 * 4 : server_connection = storage.
1136 *********************************************************************/
1137 void save_connection_destination(jb_socket sfd,
1138 const struct http_request *http,
1139 const struct forward_spec *fwd,
1140 struct reusable_connection *server_connection)
1142 assert(sfd != JB_INVALID_SOCKET);
1143 assert(NULL != http->host);
1145 server_connection->sfd = sfd;
1146 server_connection->host = strdup_or_die(http->host);
1147 server_connection->port = http->port;
1149 assert(NULL != fwd);
1150 assert(server_connection->gateway_host == NULL);
1151 assert(server_connection->gateway_port == 0);
1152 assert(server_connection->forwarder_type == 0);
1153 assert(server_connection->forward_host == NULL);
1154 assert(server_connection->forward_port == 0);
1156 server_connection->forwarder_type = fwd->type;
1157 if (NULL != fwd->gateway_host)
1159 server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1163 server_connection->gateway_host = NULL;
1165 server_connection->gateway_port = fwd->gateway_port;
1167 if (NULL != fwd->forward_host)
1169 server_connection->forward_host = strdup_or_die(fwd->forward_host);
1173 server_connection->forward_host = NULL;
1175 server_connection->forward_port = fwd->forward_port;
1179 /*********************************************************************
1181 * Function : verify_request_length
1183 * Description : Checks if we already got the whole client requests
1184 * and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1187 * Data that doesn't belong to the current request is
1188 * either thrown away to let the client retry on a clean
1189 * socket, or stashed to be dealt with after the current
1190 * request is served.
1193 * 1 : csp = Current client state (buffers, headers, etc...)
1197 *********************************************************************/
1198 static void verify_request_length(struct client_state *csp)
1200 unsigned long long buffered_request_bytes =
1201 (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1203 if ((csp->expected_client_content_length != 0)
1204 && (buffered_request_bytes != 0))
1206 if (csp->expected_client_content_length >= buffered_request_bytes)
1208 csp->expected_client_content_length -= buffered_request_bytes;
1209 log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1210 "to account for the %llu ones we already got.",
1211 csp->expected_client_content_length, buffered_request_bytes);
1215 assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1216 csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1217 log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1218 "Marking the server socket tainted after throwing %llu bytes away.",
1219 buffered_request_bytes - csp->expected_client_content_length);
1220 csp->expected_client_content_length = 0;
1221 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1224 if (csp->expected_client_content_length == 0)
1226 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1230 if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1231 && ((csp->client_iob->cur < csp->client_iob->eod)
1232 || (csp->expected_client_content_length != 0)))
1234 if (strcmpic(csp->http->gpc, "GET")
1235 && strcmpic(csp->http->gpc, "HEAD")
1236 && strcmpic(csp->http->gpc, "TRACE")
1237 && strcmpic(csp->http->gpc, "OPTIONS")
1238 && strcmpic(csp->http->gpc, "DELETE"))
1240 /* XXX: this is an incomplete hack */
1241 csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1242 log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1246 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1248 if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1250 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1251 log_error(LOG_LEVEL_CONNECT,
1252 "Possible pipeline attempt detected. The connection will not "
1253 "be kept alive and we will only serve the first request.");
1254 /* Nuke the pipelined requests from orbit, just to be sure. */
1255 clear_iob(csp->client_iob);
1260 * Keep the pipelined data around for now, we'll deal with
1261 * it once we're done serving the current request.
1263 csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1264 assert(csp->client_iob->eod >= csp->client_iob->cur);
1265 log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1266 "%d bytes of pipelined data received.",
1267 (int)(csp->client_iob->eod - csp->client_iob->cur));
1273 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1274 log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1277 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1280 /*********************************************************************
1282 * Function : mark_server_socket_tainted
1284 * Description : Makes sure we don't reuse a server socket
1285 * (if we didn't read everything the server sent
1286 * us reusing the socket would lead to garbage).
1289 * 1 : csp = Current client state (buffers, headers, etc...)
1293 *********************************************************************/
1294 static void mark_server_socket_tainted(struct client_state *csp)
1297 * For consistency we always mark the server socket
1298 * tainted, however, to reduce the log noise we only
1299 * emit a log message if the server socket could have
1300 * actually been reused.
1302 if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1303 && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1305 log_error(LOG_LEVEL_CONNECT,
1306 "Marking the server socket %d tainted.",
1307 csp->server_connection.sfd);
1309 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1312 /*********************************************************************
1314 * Function : get_request_line
1316 * Description : Read the client request line.
1319 * 1 : csp = Current client state (buffers, headers, etc...)
1321 * Returns : Pointer to request line or NULL in case of errors.
1323 *********************************************************************/
1324 static char *get_request_line(struct client_state *csp)
1326 char buf[BUFFER_SIZE];
1327 char *request_line = NULL;
1330 memset(buf, 0, sizeof(buf));
1332 if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1335 * If there are multiple pipelined requests waiting,
1336 * the flag will be set again once the next request
1339 csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1341 request_line = get_header(csp->client_iob);
1342 if ((NULL != request_line) && ('\0' != *request_line))
1344 return request_line;
1348 log_error(LOG_LEVEL_CONNECT, "No complete request line "
1349 "received yet. Continuing reading from %d.", csp->cfd);
1357 0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1359 !data_is_available(csp->cfd, csp->config->socket_timeout)
1362 if (socket_is_still_alive(csp->cfd))
1364 log_error(LOG_LEVEL_CONNECT,
1365 "No request line on socket %d received in time. Timeout: %d.",
1366 csp->cfd, csp->config->socket_timeout);
1367 write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1368 strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1369 get_write_delay(csp));
1373 log_error(LOG_LEVEL_CONNECT,
1374 "The client side of the connection on socket %d got "
1375 "closed without sending a complete request line.", csp->cfd);
1380 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1382 if (len <= 0) return NULL;
1385 * If there is no memory left for buffering the
1386 * request, there is nothing we can do but hang up
1388 if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1393 request_line = get_header(csp->client_iob);
1395 } while ((NULL != request_line) && ('\0' == *request_line));
1397 return request_line;
1403 CHUNK_STATUS_MISSING_DATA,
1404 CHUNK_STATUS_BODY_COMPLETE,
1405 CHUNK_STATUS_PARSE_ERROR
1409 /*********************************************************************
1411 * Function : chunked_body_is_complete
1413 * Description : Figures out whether or not a chunked body is complete.
1415 * Currently it always starts at the beginning of the
1416 * buffer which is somewhat wasteful and prevents Privoxy
1417 * from starting to forward the correctly parsed chunks
1418 * as soon as theoretically possible.
1420 * Should be modified to work with a common buffer,
1421 * and allow the caller to skip already parsed chunks.
1423 * This would allow the function to be used for unbuffered
1424 * response bodies as well.
1427 * 1 : iob = Buffer with the body to check.
1428 * 2 : length = Length of complete body
1430 * Returns : Enum with the result of the check.
1432 *********************************************************************/
1433 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1435 unsigned int chunksize;
1441 * We need at least a single digit, followed by "\r\n",
1442 * followed by an unknown amount of data, followed by "\r\n".
1444 if (p + 5 > iob->eod)
1446 return CHUNK_STATUS_MISSING_DATA;
1448 if (sscanf(p, "%x", &chunksize) != 1)
1450 return CHUNK_STATUS_PARSE_ERROR;
1454 * We want at least a single digit, followed by "\r\n",
1455 * followed by the specified amount of data, followed by "\r\n".
1457 if (p + chunksize + 5 > iob->eod)
1459 return CHUNK_STATUS_MISSING_DATA;
1462 /* Skip chunk-size. */
1463 p = strstr(p, "\r\n");
1466 return CHUNK_STATUS_PARSE_ERROR;
1468 /* Move beyond the chunkdata. */
1471 /* There should be another "\r\n" to skip */
1472 if (memcmp(p, "\r\n", 2))
1474 return CHUNK_STATUS_PARSE_ERROR;
1477 } while (chunksize > 0U);
1479 *length = (size_t)(p - iob->cur);
1480 assert(*length <= (size_t)(iob->eod - iob->cur));
1481 assert(p <= iob->eod);
1483 return CHUNK_STATUS_BODY_COMPLETE;
1488 /*********************************************************************
1490 * Function : receive_chunked_client_request_body
1492 * Description : Read the chunk-encoded client request body.
1493 * Failures are dealt with.
1496 * 1 : csp = Current client state (buffers, headers, etc...)
1498 * Returns : JB_ERR_OK or JB_ERR_PARSE
1500 *********************************************************************/
1501 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1504 enum chunk_status status;
1506 while (CHUNK_STATUS_MISSING_DATA ==
1507 (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1509 char buf[BUFFER_SIZE];
1512 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1514 log_error(LOG_LEVEL_ERROR,
1515 "Timeout while waiting for the client body.");
1518 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1521 log_error(LOG_LEVEL_ERROR, "Read the client body failed: %E");
1524 if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1529 if (status != CHUNK_STATUS_BODY_COMPLETE)
1531 write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1532 strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1533 log_error(LOG_LEVEL_CLF,
1534 "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1535 return JB_ERR_PARSE;
1537 log_error(LOG_LEVEL_CONNECT,
1538 "Chunked client body completely read. Length: %d", body_length);
1539 csp->expected_client_content_length = body_length;
1547 /*********************************************************************
1549 * Function : fuzz_chunked_transfer_encoding
1551 * Description : Treat the fuzzed input as chunked transfer encoding
1552 * to check and dechunk.
1555 * 1 : csp = Used to store the data.
1556 * 2 : fuzz_input_file = File to read the input from.
1558 * Returns : Result of dechunking
1560 *********************************************************************/
1561 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1564 size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1565 enum chunk_status status;
1567 status = chunked_body_is_complete(csp->iob, &length);
1568 if (CHUNK_STATUS_BODY_COMPLETE != status)
1570 log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1573 return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1578 /*********************************************************************
1580 * Function : fuzz_client_request
1582 * Description : Try to get a client request from the fuzzed input.
1585 * 1 : csp = Current client state (buffers, headers, etc...)
1586 * 2 : fuzz_input_file = File to read the input from.
1588 * Returns : Result of fuzzing.
1590 *********************************************************************/
1591 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1596 csp->ip_addr_str = "fuzzer";
1598 if (strcmp(fuzz_input_file, "-") != 0)
1600 log_error(LOG_LEVEL_FATAL,
1601 "Fuzzed client requests can currenty only be read from stdin (-).");
1603 err = receive_client_request(csp);
1604 if (err != JB_ERR_OK)
1608 err = parse_client_request(csp);
1609 if (err != JB_ERR_OK)
1617 #endif /* def FUZZ */
1620 #ifdef FEATURE_FORCE_LOAD
1621 /*********************************************************************
1623 * Function : force_required
1625 * Description : Checks a request line to see if it contains
1626 * the FORCE_PREFIX. If it does, it is removed
1627 * unless enforcing requests has beend disabled.
1630 * 1 : request_line = HTTP request line
1632 * Returns : TRUE if force is required, FALSE otherwise.
1634 *********************************************************************/
1635 static int force_required(const struct client_state *csp, char *request_line)
1639 p = strstr(request_line, "http://");
1643 p += strlen("http://");
1647 /* Intercepted request usually don't specify the protocol. */
1651 /* Go to the beginning of the path */
1656 * If the path is missing the request line is invalid and we
1657 * are done here. The client-visible rejection happens later on.
1662 if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1664 if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1666 /* XXX: Should clean more carefully */
1667 strclean(request_line, FORCE_PREFIX);
1668 log_error(LOG_LEVEL_FORCE,
1669 "Enforcing request: \"%s\".", request_line);
1673 log_error(LOG_LEVEL_FORCE,
1674 "Ignored force prefix in request: \"%s\".", request_line);
1680 #endif /* def FEATURE_FORCE_LOAD */
1683 /*********************************************************************
1685 * Function : receive_client_request
1687 * Description : Read the client's request (more precisely the
1688 * client headers) and answer it if necessary.
1691 * 1 : csp = Current client state (buffers, headers, etc...)
1693 * Returns : JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1695 *********************************************************************/
1696 static jb_err receive_client_request(struct client_state *csp)
1698 char buf[BUFFER_SIZE];
1701 struct http_request *http;
1705 /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1706 struct list header_list;
1707 struct list *headers = &header_list;
1709 /* We don't care if the arriving data is a valid HTTP request or not. */
1710 csp->requests_received_total++;
1714 memset(buf, 0, sizeof(buf));
1716 req = get_request_line(csp);
1719 mark_server_socket_tainted(csp);
1720 return JB_ERR_PARSE;
1722 assert(*req != '\0');
1724 if (client_protocol_is_unsupported(csp, req))
1726 return JB_ERR_PARSE;
1729 #ifdef FEATURE_FORCE_LOAD
1730 if (force_required(csp, req))
1732 csp->flags |= CSP_FLAG_FORCED;
1734 #endif /* def FEATURE_FORCE_LOAD */
1736 err = parse_http_request(req, http);
1738 if (JB_ERR_OK != err)
1740 write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1741 get_write_delay(csp));
1742 /* XXX: Use correct size */
1743 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1744 log_error(LOG_LEVEL_ERROR,
1745 "Couldn't parse request line received from %s: %s",
1746 csp->ip_addr_str, jb_err_to_string(err));
1748 free_http_request(http);
1749 return JB_ERR_PARSE;
1752 /* grab the rest of the client's headers */
1756 p = get_header(csp->client_iob);
1760 /* There are no additional headers to read. */
1767 * We didn't receive a complete header
1768 * line yet, get the rest of it.
1770 if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1772 log_error(LOG_LEVEL_ERROR,
1773 "Stopped grabbing the client headers.");
1774 destroy_list(headers);
1775 return JB_ERR_PARSE;
1778 len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1781 log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1782 destroy_list(headers);
1783 return JB_ERR_PARSE;
1786 if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1789 * If there is no memory left for buffering the
1790 * request, there is nothing we can do but hang up
1792 destroy_list(headers);
1793 return JB_ERR_MEMORY;
1798 if (!strncmpic(p, "Transfer-Encoding:", 18))
1801 * XXX: should be called through sed()
1802 * but currently can't.
1804 client_transfer_encoding(csp, &p);
1807 * We were able to read a complete
1808 * header and can finally enlist it.
1815 if (http->host == NULL)
1818 * If we still don't know the request destination,
1819 * the request is invalid or the client uses
1820 * Privoxy without its knowledge.
1822 if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1825 * Our attempts to get the request destination
1826 * elsewhere failed or Privoxy is configured
1827 * to only accept proxy requests.
1829 * An error response has already been send
1830 * and we're done here.
1832 return JB_ERR_PARSE;
1836 #ifdef FEATURE_CLIENT_TAGS
1837 /* XXX: If the headers were enlisted sooner, passing csp would do. */
1838 set_client_address(csp, headers);
1839 get_tag_list_for_client(csp->client_tags, csp->client_address);
1843 * Determine the actions for this URL
1845 #ifdef FEATURE_TOGGLE
1846 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1848 /* Most compatible set of actions (i.e. none) */
1849 init_current_action(csp->action);
1852 #endif /* ndef FEATURE_TOGGLE */
1854 get_url_actions(csp, http);
1857 enlist(csp->headers, http->cmd);
1859 /* Append the previously read headers */
1860 err = list_append_list_unique(csp->headers, headers);
1861 destroy_list(headers);
1868 /*********************************************************************
1870 * Function : parse_client_request
1872 * Description : Parses the client's request and decides what to do
1875 * Note that since we're not using select() we could get
1876 * blocked here if a client connected, then didn't say
1880 * 1 : csp = Current client state (buffers, headers, etc...)
1882 * Returns : JB_ERR_OK or JB_ERR_PARSE
1884 *********************************************************************/
1885 static jb_err parse_client_request(struct client_state *csp)
1887 struct http_request *http = csp->http;
1890 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1891 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1892 && (!strcmpic(csp->http->ver, "HTTP/1.1"))
1893 && (csp->http->ssl == 0))
1895 /* Assume persistence until further notice */
1896 csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1899 if (csp->http->ssl == 0)
1902 * This whole block belongs to chat() but currently
1903 * has to be executed before sed().
1905 if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1907 if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1909 return JB_ERR_PARSE;
1914 csp->expected_client_content_length = get_expected_content_length(csp->headers);
1916 verify_request_length(csp);
1920 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1922 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1924 err = sed(csp, FILTER_CLIENT_HEADERS);
1925 if (JB_ERR_OK != err)
1927 log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
1929 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1930 csp->ip_addr_str, csp->http->cmd);
1931 write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
1932 return JB_ERR_PARSE;
1934 csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
1936 /* Check request line for rewrites. */
1937 if ((NULL == csp->headers->first->str)
1938 || (strcmp(http->cmd, csp->headers->first->str) &&
1939 (JB_ERR_OK != change_request_destination(csp))))
1942 * A header filter broke the request line - bail out.
1944 write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
1945 strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
1946 /* XXX: Use correct size */
1947 log_error(LOG_LEVEL_CLF,
1948 "%s - - [%T] \"Invalid request generated\" 500 0", csp->ip_addr_str);
1949 log_error(LOG_LEVEL_ERROR,
1950 "Invalid request line after applying header filters.");
1951 free_http_request(http);
1953 return JB_ERR_PARSE;
1956 if (client_has_unsupported_expectations(csp))
1958 return JB_ERR_PARSE;
1966 /*********************************************************************
1968 * Function : send_http_request
1970 * Description : Sends the HTTP headers from the client request
1971 * and all the body data that has already been received.
1974 * 1 : csp = Current client state (buffers, headers, etc...)
1976 * Returns : 0 on success, anything else is an error.
1978 *********************************************************************/
1979 static int send_http_request(struct client_state *csp)
1984 hdr = list_to_text(csp->headers);
1987 /* FIXME Should handle error properly */
1988 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
1990 list_remove_all(csp->headers);
1993 * Write the client's (modified) header to the server
1994 * (along with anything else that may be in the buffer)
1996 write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2001 log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2002 csp->http->hostport);
2004 else if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2005 && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2008 log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2009 csp->http->hostport);
2012 return write_failure;
2017 #ifdef FEATURE_HTTPS_FILTERING
2018 /*********************************************************************
2020 * Function : send_https_request
2022 * Description : Sends the HTTP headers from the client request
2023 * and all the body data that has already been received.
2026 * 1 : csp = Current client state (buffers, headers, etc...)
2028 * Returns : 0 on success, anything else is an error.
2030 *********************************************************************/
2031 static int send_https_request(struct client_state *csp)
2037 hdr = list_to_text(csp->https_headers);
2040 /* FIXME Should handle error properly */
2041 log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2043 list_remove_all(csp->https_headers);
2046 * Write the client's (modified) header to the server
2047 * (along with anything else that may be in the buffer)
2049 ret = ssl_send_data(&(csp->mbedtls_server_attr.ssl),
2050 (const unsigned char *)hdr, strlen(hdr));
2055 log_error(LOG_LEVEL_CONNECT,
2056 "Failed sending encrypted request headers to: %s: %E",
2057 csp->http->hostport);
2058 mark_server_socket_tainted(csp);
2059 close_client_and_server_ssl_connections(csp);
2063 if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2064 && ((flushed = ssl_flush_socket(&(csp->mbedtls_server_attr.ssl),
2065 csp->client_iob)) < 0))
2067 log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2068 csp->http->hostport);
2073 if (csp->expected_client_content_length != 0)
2075 if (csp->expected_client_content_length < flushed)
2077 log_error(LOG_LEVEL_ERROR,
2078 "Flushed %d bytes of request body while only expecting %llu",
2079 flushed, csp->expected_client_content_length);
2080 csp->expected_client_content_length = 0;
2084 log_error(LOG_LEVEL_CONNECT,
2085 "Flushed %d bytes of request body while expecting %llu",
2086 flushed, csp->expected_client_content_length);
2087 csp->expected_client_content_length -= (unsigned)flushed;
2092 log_error(LOG_LEVEL_CONNECT,
2093 "Flushed %d bytes of request body", flushed);
2097 log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2104 /*********************************************************************
2106 * Function : receive_encrypted_request
2108 * Description : Receives an encrypted request.
2111 * 1 : csp = Current client state (buffers, headers, etc...)
2113 * Returns : JB_ERR_OK on success,
2114 * JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2116 *********************************************************************/
2117 static jb_err receive_encrypted_request(struct client_state *csp)
2119 char buf[BUFFER_SIZE];
2125 log_error(LOG_LEVEL_HEADER, "Reading encrypted headers");
2126 if (!data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout))
2128 log_error(LOG_LEVEL_CONNECT,
2129 "Socket %d timed out while waiting for client headers", csp->cfd);
2130 return JB_ERR_PARSE;
2132 len = ssl_recv_data(&(csp->mbedtls_client_attr.ssl),
2133 (unsigned char *)buf, sizeof(buf));
2136 return JB_ERR_PARSE;
2138 if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2140 return JB_ERR_MEMORY;
2142 p = strstr(csp->client_iob->cur, "\r\n\r\n");
2143 } while (p == NULL);
2145 log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2151 /*********************************************************************
2153 * Function : process_encrypted_request
2155 * Description : Receives and parses an encrypted request.
2158 * 1 : csp = Current client state (buffers, headers, etc...)
2160 * Returns : JB_ERR_OK on success,
2161 * JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2163 *********************************************************************/
2164 static jb_err process_encrypted_request(struct client_state *csp)
2169 /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2170 struct list header_list;
2171 struct list *headers = &header_list;
2173 err = receive_encrypted_request(csp);
2174 if (err != JB_ERR_OK)
2176 /* XXX: Also used for JB_ERR_MEMORY */
2177 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2178 (const unsigned char *)CHEADER, strlen(CHEADER));
2182 /* We don't need get_request_line() because the whole HTTP head is buffered. */
2183 request_line = get_header(csp->client_iob);
2184 if (request_line == NULL)
2186 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2187 (const unsigned char *)CHEADER, strlen(CHEADER));
2188 return JB_ERR_PARSE;
2190 assert(*request_line != '\0');
2192 if (client_protocol_is_unsupported(csp, request_line))
2194 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2195 (const unsigned char *)CHEADER, strlen(CHEADER));
2196 return JB_ERR_PARSE;
2199 #ifdef FEATURE_FORCE_LOAD
2200 if (force_required(csp, request_line))
2202 csp->flags |= CSP_FLAG_FORCED;
2204 #endif /* def FEATURE_FORCE_LOAD */
2206 free_http_request(csp->http);
2208 err = parse_http_request(request_line, csp->http);
2209 /* XXX: Restore ssl setting. This is ugly */
2210 csp->http->client_ssl = 1;
2211 csp->http->server_ssl = 1;
2213 freez(request_line);
2214 if (JB_ERR_OK != err)
2216 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2217 (const unsigned char *)CHEADER, strlen(CHEADER));
2218 /* XXX: Use correct size */
2219 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2220 log_error(LOG_LEVEL_ERROR,
2221 "Couldn't parse request line received from %s: %s",
2222 csp->ip_addr_str, jb_err_to_string(err));
2224 free_http_request(csp->http);
2225 return JB_ERR_PARSE;
2228 /* Parse the rest of the client's headers. */
2232 p = get_header(csp->client_iob);
2236 /* There are no additional headers to read. */
2243 if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2246 * Our attempts to get the request destination
2249 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2250 (const unsigned char *)CHEADER, strlen(CHEADER));
2251 return JB_ERR_PARSE;
2254 #ifndef FEATURE_EXTENDED_HOST_PATTERNS
2255 /* Split the domain we just got for pattern matching */
2256 init_domain_components(csp->http);
2260 * Determine the actions for this URL
2262 #ifdef FEATURE_TOGGLE
2263 if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
2265 /* Most compatible set of actions (i.e. none) */
2266 init_current_action(csp->action);
2269 #endif /* ndef FEATURE_TOGGLE */
2271 get_url_actions(csp, csp->http);
2274 enlist(csp->https_headers, csp->http->cmd);
2276 /* Append the previously read headers */
2277 err = list_append_list_unique(csp->https_headers, headers);
2278 destroy_list(headers);
2279 if (JB_ERR_OK != err)
2281 /* XXX: Send error message */
2285 /* XXX: Work around crash */
2286 csp->error_message = NULL;
2288 /* XXX: Why do this here? */
2291 err = sed_https(csp);
2292 if (JB_ERR_OK != err)
2294 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2295 (const unsigned char *)CHEADER, strlen(CHEADER));
2296 log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2298 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2299 csp->ip_addr_str, csp->http->cmd);
2300 return JB_ERR_PARSE;
2303 log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2311 /*********************************************************************
2313 * Function : handle_established_connection
2315 * Description : Shuffle data between client and server once the
2316 * connection has been established.
2319 * 1 : csp = Current client state (buffers, headers, etc...)
2321 * Returns : Nothing.
2323 *********************************************************************/
2324 static void handle_established_connection(struct client_state *csp)
2330 struct pollfd poll_fds[2];
2334 struct timeval timeout;
2337 int ms_iis5_hack = 0;
2338 unsigned long long byte_count = 0;
2339 struct http_request *http;
2340 long len = 0; /* for buffer sizes (and negative error codes) */
2341 int buffer_and_filter_content = 0;
2342 unsigned int write_delay;
2343 #ifdef FEATURE_HTTPS_FILTERING
2345 int use_ssl_tunnel = 0;
2346 csp->dont_verify_certificate = 0;
2349 * Preset flags informing if SSL connections with server or client
2350 * are opened or closed
2352 csp->ssl_with_server_is_opened = 0;
2353 csp->ssl_with_client_is_opened = 0;
2355 if (csp->http->ssl && !(csp->action->flags & ACTION_ENABLE_HTTPS_FILTER))
2357 /* Pass encrypted content without filtering. */
2362 /* Skeleton for HTTP response, if we should intercept the request */
2363 struct http_response *rsp;
2364 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2365 int watch_client_socket;
2368 csp->receive_buffer_size = csp->config->receive_buffer_size;
2369 csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
2370 if (csp->receive_buffer == NULL)
2372 log_error(LOG_LEVEL_ERROR,
2373 "Out of memory. Failed to allocate the receive buffer.");
2374 rsp = cgi_error_memory();
2375 send_crunch_response(csp, rsp);
2382 maxfd = (csp->cfd > csp->server_connection.sfd) ?
2383 csp->cfd : csp->server_connection.sfd;
2386 /* pass data between the client and server
2387 * until one or the other shuts down the connection.
2392 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2393 watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
2395 write_delay = get_write_delay(csp);
2402 * FD_ZERO here seems to point to an errant macro which crashes.
2403 * So do this by hand for now...
2405 memset(&rfds,0x00,sizeof(fd_set));
2409 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2410 if (!watch_client_socket)
2412 maxfd = csp->server_connection.sfd;
2415 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2417 FD_SET(csp->cfd, &rfds);
2420 FD_SET(csp->server_connection.sfd, &rfds);
2421 #endif /* ndef HAVE_POLL */
2423 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2424 if ((csp->flags & CSP_FLAG_CHUNKED)
2425 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
2426 && ((csp->iob->eod - csp->iob->cur) >= 5)
2427 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
2430 * XXX: This check should be obsolete now,
2431 * but let's wait a while to be sure.
2433 log_error(LOG_LEVEL_CONNECT,
2434 "Looks like we got the last chunk together with "
2435 "the server headers but didn't detect it earlier. "
2436 "We better stop reading.");
2437 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
2438 csp->expected_content_length = byte_count;
2439 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2441 if (server_body && server_response_is_complete(csp, byte_count))
2443 if (csp->expected_content_length == byte_count)
2445 log_error(LOG_LEVEL_CONNECT,
2446 "Done reading from server. Content length: %llu as expected. "
2447 "Bytes most recently read: %d.",
2452 log_error(LOG_LEVEL_CONNECT,
2453 "Done reading from server. Expected content length: %llu. "
2454 "Actual content length: %llu. Bytes most recently read: %d.",
2455 csp->expected_content_length, byte_count, len);
2459 * XXX: Should not jump around, handle_established_connection()
2460 * is complicated enough already.
2464 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2466 #ifdef FEATURE_HTTPS_FILTERING
2468 * Test if some data from client or destination server are pending
2469 * on TLS/SSL. We must work with them preferably. TLS/SSL data can
2470 * be pending because of maximal fragment size.
2472 int read_ssl_server = 0;
2473 int read_ssl_client = 0;
2475 if (client_use_ssl(csp))
2477 read_ssl_client = is_ssl_pending(&(csp->mbedtls_client_attr.ssl)) != 0;
2480 if (server_use_ssl(csp))
2482 read_ssl_server = is_ssl_pending(&(csp->mbedtls_server_attr.ssl)) != 0;
2485 if (!read_ssl_server && !read_ssl_client)
2489 poll_fds[0].fd = csp->cfd;
2490 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2491 if (!watch_client_socket)
2494 * Ignore incoming data, but still watch out
2495 * for disconnects etc. These flags are always
2496 * implied anyway but explicitly setting them
2499 poll_fds[0].events = POLLERR|POLLHUP;
2504 poll_fds[0].events = POLLIN;
2506 poll_fds[1].fd = csp->server_connection.sfd;
2507 poll_fds[1].events = POLLIN;
2508 n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
2510 timeout.tv_sec = csp->config->socket_timeout;
2511 timeout.tv_usec = 0;
2512 n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
2513 #endif /* def HAVE_POLL */
2515 /*server or client not responding in timeout */
2518 log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
2519 csp->config->socket_timeout, http->url);
2520 if ((byte_count == 0) && (http->ssl == 0))
2522 send_crunch_response(csp, error_response(csp, "connection-timeout"));
2524 mark_server_socket_tainted(csp);
2525 #ifdef FEATURE_HTTPS_FILTERING
2526 close_client_and_server_ssl_connections(csp);
2533 log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
2535 log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
2537 mark_server_socket_tainted(csp);
2538 #ifdef FEATURE_HTTPS_FILTERING
2539 close_client_and_server_ssl_connections(csp);
2544 #ifdef FEATURE_HTTPS_FILTERING
2547 /* set FD if some data are pending on TLS/SSL connections */
2551 if (read_ssl_client)
2554 poll_fds[0].fd = csp->cfd;
2555 poll_fds[0].events = POLLIN;
2557 FD_SET(csp->cfd, &rfds);
2562 if (read_ssl_server)
2565 poll_fds[1].fd = csp->server_connection.sfd;
2566 poll_fds[1].events = POLLIN;
2568 FD_SET(csp->server_connection.sfd, &rfds);
2575 * This is the body of the browser's request,
2576 * just read and write it.
2578 * Receives data from browser and sends it to server
2580 * XXX: Make sure the client doesn't use pipelining
2581 * behind Privoxy's back.
2584 if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
2586 log_error(LOG_LEVEL_CONNECT,
2587 "The client socket %d has become unusable while "
2588 "the server socket %d is still open.",
2589 csp->cfd, csp->server_connection.sfd);
2590 mark_server_socket_tainted(csp);
2594 if (poll_fds[0].revents != 0)
2596 if (FD_ISSET(csp->cfd, &rfds))
2597 #endif /* def HAVE_POLL*/
2599 int max_bytes_to_read = (int)csp->receive_buffer_size;
2601 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2602 if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
2604 if (data_is_available(csp->cfd, 0))
2607 * If the next request is already waiting, we have
2608 * to stop select()ing the client socket. Otherwise
2609 * we would always return right away and get nothing
2612 watch_client_socket = 0;
2613 log_error(LOG_LEVEL_CONNECT,
2614 "Stop watching client socket %d. "
2615 "There's already another request waiting.",
2620 * If the client socket is set, but there's no data
2621 * available on the socket, the client went fishing
2622 * and continuing talking to the server makes no sense.
2624 log_error(LOG_LEVEL_CONNECT,
2625 "The client closed socket %d while "
2626 "the server socket %d is still open.",
2627 csp->cfd, csp->server_connection.sfd);
2628 mark_server_socket_tainted(csp);
2631 if (csp->expected_client_content_length != 0)
2633 if (csp->expected_client_content_length < csp->receive_buffer_size)
2635 max_bytes_to_read = (int)csp->expected_client_content_length;
2637 log_error(LOG_LEVEL_CONNECT,
2638 "Waiting for up to %d bytes from the client.",
2641 assert(max_bytes_to_read <= csp->receive_buffer_size);
2642 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2644 #ifdef FEATURE_HTTPS_FILTERING
2646 * Reading data from standard or secured connection (HTTP/HTTPS)
2648 if (client_use_ssl(csp))
2651 * Receiving HTTP request from client over TLS/SSL and sending
2652 * it to server over TLS/SSL.
2654 len = ssl_recv_data(&(csp->mbedtls_client_attr.ssl),
2655 (unsigned char *)csp->receive_buffer, (size_t)max_bytes_to_read);
2659 mark_server_socket_tainted(csp);
2663 ret = ssl_send_data(&(csp->mbedtls_server_attr.ssl),
2664 (const unsigned char *)csp->receive_buffer, (size_t)len);
2668 log_error(LOG_LEVEL_ERROR,
2669 "Send request over TLS/SSL to: %s failed", http->host);
2670 mark_server_socket_tainted(csp);
2671 close_client_and_server_ssl_connections(csp);
2676 #endif /* def FEATURE_HTTPS_FILTERING */
2678 len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
2682 /* XXX: not sure if this is necessary. */
2683 mark_server_socket_tainted(csp);
2684 break; /* "game over, man" */
2687 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2688 if (csp->expected_client_content_length != 0)
2690 assert(len <= max_bytes_to_read);
2691 csp->expected_client_content_length -= (unsigned)len;
2692 log_error(LOG_LEVEL_CONNECT,
2693 "Expected client content length set to %llu "
2694 "after reading %d bytes.",
2695 csp->expected_client_content_length, len);
2696 if (csp->expected_client_content_length == 0)
2698 log_error(LOG_LEVEL_CONNECT,
2699 "Done reading from the client.");
2700 csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
2703 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2705 if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
2707 log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
2708 mark_server_socket_tainted(csp);
2709 #ifdef FEATURE_HTTPS_FILTERING
2710 close_client_and_server_ssl_connections(csp);
2719 * The server wants to talk. It could be the header or the body.
2720 * If `hdr' is null, then it's the header otherwise it's the body.
2721 * FIXME: Does `hdr' really mean `host'? No.
2724 if (poll_fds[1].revents != 0)
2726 if (FD_ISSET(csp->server_connection.sfd, &rfds))
2727 #endif /* HAVE_POLL */
2729 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2731 * If we are buffering content, we don't want to eat up to
2732 * buffer-limit bytes if the client no longer cares about them.
2733 * If we aren't buffering, however, a dead client socket will be
2734 * noticed pretty much right away anyway, so we can reduce the
2735 * overhead by skipping the check.
2737 if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
2740 log_error(LOG_LEVEL_CONNECT,
2741 "The server still wants to talk, but the client may already have hung up on us.");
2743 log_error(LOG_LEVEL_CONNECT,
2744 "The server still wants to talk, but the client hung up on us.");
2745 mark_server_socket_tainted(csp);
2746 #ifdef FEATURE_HTTPS_FILTERING
2747 close_client_and_server_ssl_connections(csp);
2750 #endif /* def _WIN32 */
2752 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
2754 #ifdef FEATURE_HTTPS_FILTERING
2756 * Reading data from standard or secured connection (HTTP/HTTPS)
2758 if (server_use_ssl(csp))
2760 len = ssl_recv_data(&(csp->mbedtls_server_attr.ssl),
2761 (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
2766 len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
2767 (int)csp->receive_buffer_size);
2772 log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
2774 if ((http->ssl && (csp->fwd == NULL))
2775 #ifdef FEATURE_HTTPS_FILTERING
2781 * Just hang up. We already confirmed the client's CONNECT
2782 * request with status code 200 and unencrypted content is
2783 * no longer welcome.
2785 log_error(LOG_LEVEL_ERROR,
2786 "CONNECT already confirmed. Unable to tell the client about the problem.");
2789 else if (byte_count)
2792 * Just hang up. We already transmitted the original headers
2793 * and parts of the original content and therefore missed the
2794 * chance to send an error message (without risking data corruption).
2796 * XXX: we could retry with a fancy range request here.
2798 log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
2799 "Unable to tell the client about the problem.");
2800 mark_server_socket_tainted(csp);
2801 #ifdef FEATURE_HTTPS_FILTERING
2802 close_client_and_server_ssl_connections(csp);
2807 * XXX: Consider handling the cases above the same.
2809 mark_server_socket_tainted(csp);
2813 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2814 if (csp->flags & CSP_FLAG_CHUNKED)
2816 if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
2818 /* XXX: this is a temporary hack */
2819 log_error(LOG_LEVEL_CONNECT,
2820 "Looks like we reached the end of the last chunk. "
2821 "We better stop reading.");
2822 csp->expected_content_length = byte_count + (unsigned long long)len;
2823 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
2827 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
2830 * This is guaranteed by allocating with zalloc_or_die()
2831 * and never (intentionally) writing to the last byte.
2833 * csp->receive_buffer_size is the size of the part of the
2834 * buffer we intentionally write to, but we actually
2835 * allocated csp->receive_buffer_size+1 bytes so the assertion
2836 * stays within the allocated range.
2838 assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
2841 * Add a trailing zero to let be able to use string operations.
2842 * XXX: do we still need this with filter_popups gone?
2844 assert(len <= csp->receive_buffer_size);
2845 csp->receive_buffer[len] = '\0';
2848 * Normally, this would indicate that we've read
2849 * as much as the server has sent us and we can
2850 * close the client connection. However, Microsoft
2851 * in its wisdom has released IIS/5 with a bug that
2852 * prevents it from sending the trailing \r\n in
2853 * a 302 redirect header (and possibly other headers).
2854 * To work around this if we've haven't parsed
2855 * a full header we'll append a trailing \r\n
2856 * and see if this now generates a valid one.
2858 * This hack shouldn't have any impacts. If we've
2859 * already transmitted the header or if this is a
2860 * SSL connection, then we won't bother with this
2861 * hack. So we only work on partially received
2862 * headers. If we append a \r\n and this still
2863 * doesn't generate a valid header, then we won't
2864 * transmit anything to the client.
2869 if (server_body || (http->ssl
2870 #ifdef FEATURE_HTTPS_FILTERING
2876 * If we have been buffering up the document,
2877 * now is the time to apply content modification
2878 * and send the result to the client.
2880 if (buffer_and_filter_content)
2882 p = execute_content_filters(csp);
2884 * If content filtering fails, use the original
2885 * buffer and length.
2886 * (see p != NULL ? p : csp->iob->cur below)
2890 csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
2892 #ifdef FEATURE_COMPRESSION
2893 else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
2894 && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
2896 char *compressed_content = compress_buffer(p,
2897 (size_t *)&csp->content_length, csp->config->compression_level);
2898 if (compressed_content != NULL)
2901 p = compressed_content;
2902 csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
2907 if (JB_ERR_OK != update_server_headers(csp))
2909 log_error(LOG_LEVEL_FATAL,
2910 "Failed to update server headers. after filtering.");
2913 hdr = list_to_text(csp->headers);
2916 /* FIXME Should handle error properly */
2917 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
2920 #ifdef FEATURE_HTTPS_FILTERING
2922 * Sending data with standard or secured connection (HTTP/HTTPS)
2924 if (client_use_ssl(csp))
2926 if ((ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2927 (const unsigned char *)hdr, strlen(hdr)) < 0)
2928 || (ssl_send_data(&(csp->mbedtls_client_attr.ssl),
2929 (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
2930 csp->content_length) < 0))
2932 log_error(LOG_LEVEL_ERROR, "write modified content to "
2933 "client over TLS/SSL failed");
2936 mark_server_socket_tainted(csp);
2937 close_client_and_server_ssl_connections(csp);
2942 #endif /* def FEATURE_HTTPS_FILTERING */
2944 if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
2945 || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
2946 (size_t)csp->content_length, write_delay))
2948 log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
2951 mark_server_socket_tainted(csp);
2952 #ifdef FEATURE_HTTPS_FILTERING
2953 close_client_and_server_ssl_connections(csp);
2963 break; /* "game over, man" */
2967 * This is NOT the body, so
2968 * Let's pretend the server just sent us a blank line.
2970 snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
2971 len = (int)strlen(csp->receive_buffer);
2974 * Now, let the normal header parsing algorithm below do its
2975 * job. If it fails, we'll exit instead of continuing.
2982 * If we're in the body of the server document, just write it to
2983 * the client, unless we need to buffer the body for later
2984 * content-filtering.
2986 if (server_body || (http->ssl
2987 #ifdef FEATURE_HTTPS_FILTERING
2992 if (buffer_and_filter_content)
2995 * If there is no memory left for buffering the content, or the buffer limit
2996 * has been reached, switch to non-filtering mode, i.e. make & write the
2997 * header, flush the iob and buf, and get out of the way.
2999 if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3004 log_error(LOG_LEVEL_INFO,
3005 "Flushing header and buffers. Stepping back from filtering.");
3007 hdr = list_to_text(csp->headers);
3011 * Memory is too tight to even generate the header.
3012 * Send our static "Out-of-memory" page.
3014 log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3015 rsp = cgi_error_memory();
3016 send_crunch_response(csp, rsp);
3017 mark_server_socket_tainted(csp);
3018 #ifdef FEATURE_HTTPS_FILTERING
3019 close_client_and_server_ssl_connections(csp);
3023 hdrlen = strlen(hdr);
3025 #ifdef FEATURE_HTTPS_FILTERING
3027 * Sending data with standard or secured connection (HTTP/HTTPS)
3029 if (client_use_ssl(csp))
3031 if ((ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3032 (const unsigned char *)hdr, hdrlen) < 0)
3033 || ((flushed = ssl_flush_socket(&(csp->mbedtls_client_attr.ssl),
3035 || (ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3036 (const unsigned char *)csp->receive_buffer, (size_t)len) < 0))
3038 log_error(LOG_LEVEL_CONNECT,
3039 "Flush header and buffers to client failed");
3041 mark_server_socket_tainted(csp);
3042 close_client_and_server_ssl_connections(csp);
3047 #endif /* def FEATURE_HTTPS_FILTERING */
3049 if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3050 || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3051 || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3054 log_error(LOG_LEVEL_CONNECT,
3055 "Flush header and buffers to client failed: %E");
3057 mark_server_socket_tainted(csp);
3058 #ifdef FEATURE_HTTPS_FILTERING
3059 close_client_and_server_ssl_connections(csp);
3066 * Reset the byte_count to the amount of bytes
3067 * we just flushed. len will be added a few lines below,
3068 * hdrlen doesn't matter for LOG_LEVEL_CLF.
3070 byte_count = (unsigned long long)flushed;
3072 buffer_and_filter_content = 0;
3078 #ifdef FEATURE_HTTPS_FILTERING
3080 * Sending data with standard or secured connection (HTTP/HTTPS)
3082 if (client_use_ssl(csp))
3084 ret = ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3085 (const unsigned char *)csp->receive_buffer, (size_t)len);
3088 log_error(LOG_LEVEL_ERROR,
3089 "Sending data to client failed");
3090 mark_server_socket_tainted(csp);
3091 close_client_and_server_ssl_connections(csp);
3096 #endif /* def FEATURE_HTTPS_FILTERING */
3098 if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3099 (size_t)len, write_delay))
3101 log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3102 mark_server_socket_tainted(csp);
3103 #ifdef FEATURE_HTTPS_FILTERING
3104 close_client_and_server_ssl_connections(csp);
3110 byte_count += (unsigned long long)len;
3116 * We're still looking for the end of the server's header.
3117 * Buffer up the data we just read. If that fails, there's
3118 * little we can do but send our static out-of-memory page.
3120 if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3122 log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3123 rsp = cgi_error_memory();
3124 send_crunch_response(csp, rsp);
3125 mark_server_socket_tainted(csp);
3126 #ifdef FEATURE_HTTPS_FILTERING
3127 close_client_and_server_ssl_connections(csp);
3132 /* Convert iob into something sed() can digest */
3133 if (JB_ERR_PARSE == get_server_headers(csp))
3138 * Well, we tried our MS IIS/5 hack and it didn't work.
3139 * The header is incomplete and there isn't anything
3140 * we can do about it.
3142 log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3143 "Applying the MS IIS5 hack didn't help.");
3144 log_error(LOG_LEVEL_CLF,
3145 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3146 #ifdef FEATURE_HTTPS_FILTERING
3148 * Sending data with standard or secured connection (HTTP/HTTPS)
3150 if (client_use_ssl(csp))
3152 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3153 (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3154 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3157 #endif /* def FEATURE_HTTPS_FILTERING */
3159 write_socket_delayed(csp->cfd,
3160 INVALID_SERVER_HEADERS_RESPONSE,
3161 strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3163 mark_server_socket_tainted(csp);
3164 #ifdef FEATURE_HTTPS_FILTERING
3165 close_client_and_server_ssl_connections(csp);
3172 * Since we have to wait for more from the server before
3173 * we can parse the headers we just continue here.
3175 log_error(LOG_LEVEL_CONNECT,
3176 "Continuing buffering server headers from socket %d. "
3177 "Bytes most recently read: %d.", csp->cfd, len);
3184 * Account for the content bytes we
3185 * might have gotten with the headers.
3187 assert(csp->iob->eod >= csp->iob->cur);
3188 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3191 /* Did we actually get anything? */
3192 if (NULL == csp->headers->first)
3194 if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3196 log_error(LOG_LEVEL_ERROR,
3197 "No server or forwarder response received on socket %d. "
3198 "Closing client socket %d without sending data.",
3199 csp->server_connection.sfd, csp->cfd);
3200 log_error(LOG_LEVEL_CLF,
3201 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3205 log_error(LOG_LEVEL_ERROR,
3206 "No server or forwarder response received on socket %d.",
3207 csp->server_connection.sfd);
3208 send_crunch_response(csp, error_response(csp, "no-server-data"));
3210 free_http_request(http);
3211 mark_server_socket_tainted(csp);
3212 #ifdef FEATURE_HTTPS_FILTERING
3213 close_client_and_server_ssl_connections(csp);
3218 if (!csp->headers->first->str)
3220 log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3222 assert(csp->headers->first->str);
3224 if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3225 strncmpic(csp->headers->first->str, "ICY", 3))
3228 * It doesn't look like a HTTP (or Shoutcast) response:
3229 * tell the client and log the problem.
3231 if (strlen(csp->headers->first->str) > 30)
3233 csp->headers->first->str[30] = '\0';
3235 log_error(LOG_LEVEL_ERROR,
3236 "Invalid server or forwarder response. Starts with: %s",
3237 csp->headers->first->str);
3238 log_error(LOG_LEVEL_CLF,
3239 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3240 #ifdef FEATURE_HTTPS_FILTERING
3242 * Sending data with standard or secured connection (HTTP/HTTPS)
3244 if (client_use_ssl(csp))
3246 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3247 (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3248 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3251 #endif /* def FEATURE_HTTPS_FILTERING */
3253 write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3254 strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3256 free_http_request(http);
3257 mark_server_socket_tainted(csp);
3258 #ifdef FEATURE_HTTPS_FILTERING
3259 close_client_and_server_ssl_connections(csp);
3265 * We have now received the entire server header,
3266 * filter it and send the result to the client
3268 if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3270 log_error(LOG_LEVEL_CLF,
3271 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3272 #ifdef FEATURE_HTTPS_FILTERING
3274 * Sending data with standard or secured connection (HTTP/HTTPS)
3276 if (client_use_ssl(csp))
3278 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3279 (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3280 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3285 write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3286 strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3288 free_http_request(http);
3289 mark_server_socket_tainted(csp);
3290 #ifdef FEATURE_HTTPS_FILTERING
3291 close_client_and_server_ssl_connections(csp);
3295 hdr = list_to_text(csp->headers);
3298 /* FIXME Should handle error properly */
3299 log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3302 if ((csp->flags & CSP_FLAG_CHUNKED)
3303 && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3304 && ((csp->iob->eod - csp->iob->cur) >= 5)
3305 && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3307 log_error(LOG_LEVEL_CONNECT,
3308 "Looks like we got the last chunk together with "
3309 "the server headers. We better stop reading.");
3310 byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3311 csp->expected_content_length = byte_count;
3312 csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3315 csp->server_connection.response_received = time(NULL);
3317 if (crunch_response_triggered(csp, crunchers_light))
3320 * One of the tags created by a server-header
3321 * tagger triggered a crunch. We already
3322 * delivered the crunch response to the client
3323 * and are done here after cleaning up.
3326 mark_server_socket_tainted(csp);
3327 #ifdef FEATURE_HTTPS_FILTERING
3328 close_client_and_server_ssl_connections(csp);
3333 /* Buffer and pcrs filter this if appropriate. */
3334 buffer_and_filter_content = content_requires_filtering(csp);
3336 if (!buffer_and_filter_content)
3339 * Write the server's (modified) header to
3340 * the client (along with anything else that
3341 * may be in the buffer). Use standard or secured
3344 #ifdef FEATURE_HTTPS_FILTERING
3345 if (client_use_ssl(csp))
3347 if ((ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3348 (const unsigned char *)hdr, strlen(hdr)) < 0)
3349 || (len = ssl_flush_socket(&(csp->mbedtls_client_attr.ssl),
3352 log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
3355 * The write failed, so don't bother mentioning it
3356 * to the client... it probably can't hear us anyway.
3359 mark_server_socket_tainted(csp);
3360 #ifdef FEATURE_HTTPS_FILTERING
3361 close_client_and_server_ssl_connections(csp);
3367 #endif /* def FEATURE_HTTPS_FILTERING */
3369 if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3370 || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
3372 log_error(LOG_LEVEL_ERROR,
3373 "write header to client failed");
3375 * The write failed, so don't bother mentioning it
3376 * to the client... it probably can't hear us anyway.
3379 mark_server_socket_tainted(csp);
3380 #ifdef FEATURE_HTTPS_FILTERING
3381 close_client_and_server_ssl_connections(csp);
3388 /* we're finished with the server's header */
3394 * If this was a MS IIS/5 hack then it means the server
3395 * has already closed the connection. Nothing more to read.
3400 log_error(LOG_LEVEL_ERROR,
3401 "Closed server connection detected. "
3402 "Applying the MS IIS5 hack didn't help.");
3403 log_error(LOG_LEVEL_CLF,
3404 "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3405 #ifdef FEATURE_HTTPS_FILTERING
3407 * Sending data with standard or secured connection (HTTP/HTTPS)
3409 if (client_use_ssl(csp))
3411 ssl_send_data(&(csp->mbedtls_client_attr.ssl),
3412 (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3413 strlen(INVALID_SERVER_HEADERS_RESPONSE));
3416 #endif /* def FEATURE_HTTPS_FILTERING */
3418 write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3419 strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3421 mark_server_socket_tainted(csp);
3422 #ifdef FEATURE_HTTPS_FILTERING
3423 close_client_and_server_ssl_connections(csp);
3430 mark_server_socket_tainted(csp);
3431 #ifdef FEATURE_HTTPS_FILTERING
3432 close_client_and_server_ssl_connections(csp);
3434 return; /* huh? we should never get here */
3436 #ifdef FEATURE_HTTPS_FILTERING
3437 close_client_and_server_ssl_connections(csp);
3439 if (csp->content_length == 0)
3442 * If Privoxy didn't recalculate the Content-Length,
3443 * byte_count is still correct.
3445 csp->content_length = byte_count;
3448 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3449 if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3450 && (csp->expected_content_length != byte_count))
3452 log_error(LOG_LEVEL_CONNECT,
3453 "Received %llu bytes while expecting %llu.",
3454 byte_count, csp->expected_content_length);
3455 mark_server_socket_tainted(csp);
3459 log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
3460 csp->ip_addr_str, http->ocmd, csp->content_length);
3462 csp->server_connection.timestamp = time(NULL);
3466 /*********************************************************************
3470 * Description : Once a connection from the client has been accepted,
3471 * this function is called (via serve()) to handle the
3472 * main business of the communication. This function
3473 * returns after dealing with a single request. It can
3474 * be called multiple times with the same client socket
3475 * if the client is keeping the connection alive.
3477 * The decision whether or not a client connection will
3478 * be kept alive is up to the caller which also must
3479 * close the client socket when done.
3481 * FIXME: chat is nearly thousand lines long.
3485 * 1 : csp = Current client state (buffers, headers, etc...)
3487 * Returns : Nothing.
3489 *********************************************************************/
3490 static void chat(struct client_state *csp)
3492 const struct forward_spec *fwd;
3493 struct http_request *http;
3494 /* Skeleton for HTTP response, if we should intercept the request */
3495 struct http_response *rsp;
3496 #ifdef FEATURE_HTTPS_FILTERING
3497 int use_ssl_tunnel = 0;
3502 if (receive_client_request(csp) != JB_ERR_OK)
3506 if (parse_client_request(csp) != JB_ERR_OK)
3511 /* decide how to route the HTTP request */
3512 fwd = forward_url(csp, http);
3515 log_error(LOG_LEVEL_FATAL, "gateway spec is NULL!?!? This can't happen!");
3516 /* Never get here - LOG_LEVEL_FATAL causes program exit */
3520 #ifdef FEATURE_HTTPS_FILTERING
3522 * Setting flags to use old solution with SSL tunnel and to disable
3523 * certificates verification.
3525 if (csp->http->ssl && !(csp->action->flags & ACTION_ENABLE_HTTPS_FILTER))
3530 if (http->ssl && csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS)
3532 csp->dont_verify_certificate = 1;
3537 * build the http request to send to the server
3538 * we have to do one of the following:
3540 * create = use the original HTTP request to create a new
3541 * HTTP request that has either the path component
3542 * without the http://domainspec (w/path) or the
3543 * full orininal URL (w/url)
3544 * Note that the path and/or the HTTP version may
3545 * have been altered by now.
3547 * SSL proxy = Open a socket to the host:port of the server
3548 * and create TLS/SSL connection with server and
3549 * with client. Then behave like mediator between
3550 * client and server over TLS/SSL.
3552 * SSL proxy = Pass the request unchanged if forwarding a CONNECT
3553 * with request to a parent proxy. Note that we'll be sending
3554 * forwarding the CFAIL message ourselves if connecting to the parent
3555 * fails, but we won't send a CSUCCEED message if it works,
3556 * since that would result in a double message (ours and the
3557 * parent's). After sending the request to the parent, we
3558 * must parse answer and send it to client. If connection
3559 * with server is established, we do TLS/SSL proxy. Otherwise
3560 * we send parent response to client and close connections.
3562 * here's the matrix:
3565 * +--------+--------+
3567 * 0 | create | SSL |
3568 * | w/path | proxy |
3569 * Forwarding +--------+--------+
3571 * 1 | create | proxy |
3572 * | w/url |+forward|
3573 * +--------+--------+
3577 #ifdef FEATURE_HTTPS_FILTERING
3579 * Presetting SSL client and server flags
3581 if (http->ssl && !use_ssl_tunnel)
3583 http->client_ssl = 1;
3584 http->server_ssl = 1;
3588 http->client_ssl = 0;
3589 http->server_ssl = 0;
3593 if (http->ssl && connect_port_is_forbidden(csp))
3595 const char *acceptable_connect_ports =
3596 csp->action->string[ACTION_STRING_LIMIT_CONNECT];
3597 assert(NULL != acceptable_connect_ports);
3598 log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
3599 "limit-connect{%s} doesn't allow CONNECT requests to %s",
3600 csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
3601 csp->action->flags |= ACTION_BLOCK;
3603 #ifdef FEATURE_HTTPS_FILTERING
3604 http->client_ssl = 0;
3605 http->server_ssl = 0;
3610 freez(csp->headers->first->str);
3611 build_request_line(csp, fwd, &csp->headers->first->str);
3614 * We have a request. Check if one of the crunchers wants it.
3616 if (crunch_response_triggered(csp, crunchers_all))
3619 * Yes. The client got the crunch response and we're done here.
3624 log_applied_actions(csp->action);
3625 log_error(LOG_LEVEL_GPC, "%s%s", http->hostport, http->path);
3627 if (fwd->forward_host)
3629 log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
3630 fwd->forward_host, fwd->forward_port, http->hostport);
3634 log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
3637 /* here we connect to the server, gateway, or the forwarder */
3639 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3640 if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
3641 && socket_is_still_alive(csp->server_connection.sfd)
3642 && connection_destination_matches(&csp->server_connection, http, fwd))
3644 log_error(LOG_LEVEL_CONNECT,
3645 "Reusing server socket %d connected to %s. Total requests: %u.",
3646 csp->server_connection.sfd, csp->server_connection.host,
3647 csp->server_connection.requests_sent_total);
3651 if (csp->server_connection.sfd != JB_INVALID_SOCKET)
3653 #ifdef FEATURE_CONNECTION_SHARING
3654 if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
3656 remember_connection(&csp->server_connection);
3659 #endif /* def FEATURE_CONNECTION_SHARING */
3661 log_error(LOG_LEVEL_CONNECT,
3662 "Closing server socket %d connected to %s. Total requests: %u.",
3663 csp->server_connection.sfd, csp->server_connection.host,
3664 csp->server_connection.requests_sent_total);
3665 close_socket(csp->server_connection.sfd);
3667 mark_connection_closed(&csp->server_connection);
3669 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3670 #ifdef FEATURE_HTTPS_FILTERING
3671 if (http->ssl && !use_ssl_tunnel)
3675 * Creating an SSL proxy. If forwarding is disabled, we must send
3676 * CSUCCEED mesage to client. Then TLS/SSL connection with client
3680 if (fwd->forward_host == NULL)
3683 * We're lying to the client as the connection hasn't actually
3684 * been established yet. We don't establish the connection until
3685 * we have seen and parsed the encrypted client headers.
3687 if (write_socket_delayed(csp->cfd, CSUCCEED,
3688 strlen(CSUCCEED), get_write_delay(csp)) != 0)
3690 log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
3695 ret = create_client_ssl_connection(csp);
3698 log_error(LOG_LEVEL_ERROR,
3699 "Can't open secure connection with client");
3700 close_client_ssl_connection(csp); /* XXX: Is this needed? */
3703 if (JB_ERR_OK != process_encrypted_request(csp))
3705 log_error(LOG_LEVEL_ERROR, "Failed to parse encrypted request.");
3706 close_client_ssl_connection(csp);
3710 * We have an encrypted request. Check if one of the crunchers now
3711 * wants it (for example because the previously invisible path was
3712 * required to match).
3714 if (crunch_response_triggered(csp, crunchers_all))
3717 * Yes. The client got the crunch response and we're done here.
3719 close_client_ssl_connection(csp);
3725 * Connecting to destination server
3727 csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
3729 if (csp->server_connection.sfd == JB_INVALID_SOCKET)
3731 if (fwd->type != SOCKS_NONE)
3734 rsp = error_response(csp, "forwarding-failed");
3736 else if (errno == EINVAL)
3738 rsp = error_response(csp, "no-such-domain");
3742 rsp = error_response(csp, "connect-failed");
3745 /* Write the answer to the client */
3748 send_crunch_response(csp, rsp);
3752 * Temporary workaround to prevent already-read client
3753 * bodies from being parsed as new requests. For now we
3754 * err on the safe side and throw all the following
3755 * requests under the bus, even if no client body has been
3756 * buffered. A compliant client will repeat the dropped
3757 * requests on an untainted connection.
3759 * The proper fix is to discard the no longer needed
3760 * client body in the buffer (if there is one) and to
3761 * continue parsing the bytes that follow.
3763 drain_and_close_socket(csp->cfd);
3764 csp->cfd = JB_INVALID_SOCKET;
3769 #ifdef FEATURE_HTTPS_FILTERING
3771 * Creating TLS/SSL connections with destination server or parent
3772 * proxy. If forwarding is enabled, we must send client request to
3773 * parent proxy and receive, parse and resend parent proxy answer.
3775 if (http->ssl && !use_ssl_tunnel)
3777 if (fwd->forward_host != NULL)
3779 char server_response[BUFFER_SIZE];
3782 char *hdr = list_to_text(csp->headers);
3783 memset(server_response, 0, sizeof(server_response));
3787 log_error(LOG_LEVEL_FATAL,
3788 "Out of memory parsing client header");
3790 list_remove_all(csp->headers);
3793 * Sending client's CONNECT request to the parent proxy
3795 ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
3801 log_error(LOG_LEVEL_CONNECT,
3802 "Sending request headers to: %s failed", http->hostport);
3803 mark_server_socket_tainted(csp);
3804 close_client_ssl_connection(csp);
3808 /* Waiting for parent proxy server response */
3809 len = read_socket(csp->server_connection.sfd, server_response,
3810 sizeof(server_response)-1);
3814 log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
3815 "server on socket %d.", csp->server_connection.sfd);
3817 rsp = error_response(csp, "no-server-data");
3820 send_crunch_response(csp, rsp);
3822 mark_server_socket_tainted(csp);
3823 close_client_ssl_connection(csp);
3828 * Test if connection with destination server was established
3829 * successfully by parent proxy. Then we can send response to
3830 * the client and continue or stop.
3832 if (!tunnel_established_successfully(server_response, (unsigned int)len))
3834 log_error(LOG_LEVEL_ERROR, "Forwarder hasn't established "
3835 "connection with destination server.");
3837 write_socket(csp->cfd, server_response, (size_t)len);
3838 mark_server_socket_tainted(csp);
3839 close_client_ssl_connection(csp);
3844 * Parent proxy has established connection with destination server.
3845 * Now we must create TLS/SSL connection with parent proxy.
3847 ret = create_server_ssl_connection(csp);
3850 * If TLS/SSL connection wasn't created and invalid certificate
3851 * wasn't detected, we can interrupt this fuction. Otherwise, we
3852 * must inform the client about invalid server certificate.
3855 && (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
3856 || csp->server_cert_verification_result == SSL_CERT_VALID))
3858 rsp = error_response(csp, "connect-failed");
3861 send_crunch_response(csp, rsp);
3867 * TLS/SSL connection with parent proxy is established, we can
3868 * inform client about success.
3870 ret = write_socket(csp->cfd, server_response, (size_t)len);
3873 log_error(LOG_LEVEL_ERROR,
3874 "Sending parent proxy response to client failed");
3875 mark_server_socket_tainted(csp);
3876 close_client_ssl_connection(csp);
3879 }/* -END- if (fwd->forward_host != NULL) */
3883 * Parent proxy is not used, we can just create TLS/SSL connection
3884 * with destination server
3886 int ret = create_server_ssl_connection(csp);
3888 * If TLS/SSL connection wasn't created and invalid certificate
3889 * wasn't detected, we can interrupt this function. Otherwise, we
3890 * must inform client about invalid server certificate.
3893 && (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
3894 || csp->server_cert_verification_result == SSL_CERT_VALID))
3896 rsp = error_response(csp, "connect-failed");
3899 send_crunch_response(csp, rsp);
3904 }/* -END- if (http->ssl) */
3905 #endif /* def FEATURE_HTTPS_FILTERING */
3907 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3908 save_connection_destination(csp->server_connection.sfd,
3909 http, fwd, &csp->server_connection);
3910 csp->server_connection.keep_alive_timeout =
3911 (unsigned)csp->config->keep_alive_timeout;
3913 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3915 csp->server_connection.requests_sent_total++;
3917 if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
3919 /* Client headers have been sent optimistically */
3920 assert(csp->headers->last == NULL);
3922 else if (http->ssl == 0 || (fwd->forward_host
3923 #ifdef FEATURE_HTTPS_FILTERING
3928 if (send_http_request(csp))
3930 rsp = error_response(csp, "connect-failed");
3933 send_crunch_response(csp, rsp);
3941 * Using old solution with SSL tunnel or new solution with SSL proxy
3943 list_remove_all(csp->headers);
3944 #ifdef FEATURE_HTTPS_FILTERING
3949 * We're running an SSL tunnel and we're not forwarding,
3950 * so just ditch the client headers, send the "connect succeeded"
3951 * message to the client, flush the rest, and get out of the way.
3953 if (write_socket_delayed(csp->cfd, CSUCCEED,
3954 strlen(CSUCCEED), get_write_delay(csp)))
3959 #ifdef FEATURE_HTTPS_FILTERING
3963 * If server certificate is invalid, we must inform client and then
3964 * close connection with client.
3966 if (csp->server_cert_verification_result != SSL_CERT_VALID)
3968 ssl_send_certificate_error(csp);
3969 close_client_and_server_ssl_connections(csp);
3972 if (send_https_request(csp))
3974 rsp = error_response(csp, "connect-failed");
3977 send_crunch_response(csp, rsp); /* XXX: use ssl*/
3979 close_client_and_server_ssl_connections(csp);
3983 #endif /* def FEATURE_HTTPS_FILTERING */
3984 clear_iob(csp->client_iob);
3985 }/* -END- else ... if (http->ssl == 1) */
3987 log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
3989 /* XXX: should the time start earlier for optimistically sent data? */
3990 csp->server_connection.request_sent = time(NULL);
3992 handle_established_connection(csp);
3993 freez(csp->receive_buffer);
3998 /*********************************************************************
4000 * Function : fuzz_server_response
4002 * Description : Treat the input as a whole server response.
4005 * 1 : csp = Current client state (buffers, headers, etc...)
4006 * 2 : fuzz_input_file = File to read the input from.
4010 *********************************************************************/
4011 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4013 static struct forward_spec fwd; /* Zero'd due to being static */
4016 if (strcmp(fuzz_input_file, "-") == 0)
4018 /* XXX: Doesn'T work yet. */
4019 csp->server_connection.sfd = 0;
4023 csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4024 if (csp->server_connection.sfd == -1)
4026 log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4031 csp->content_type |= CT_GIF;
4032 csp->action->flags |= ACTION_DEANIMATE;
4033 csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4035 csp->http->path = strdup_or_die("/");
4036 csp->http->host = strdup_or_die("fuzz.example.org");
4037 csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4038 /* Prevent client socket monitoring */
4039 csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4040 csp->flags |= CSP_FLAG_CHUNKED;
4042 csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4043 csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4045 csp->content_type |= CT_DECLARED|CT_GIF;
4047 csp->config->socket_timeout = 0;
4049 cgi_init_error_messages();
4051 handle_established_connection(csp);
4052 freez(csp->receive_buffer);
4059 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4060 /*********************************************************************
4062 * Function : prepare_csp_for_next_request
4064 * Description : Put the csp in a mostly vergin state.
4067 * 1 : csp = Current client state (buffers, headers, etc...)
4071 *********************************************************************/
4072 static void prepare_csp_for_next_request(struct client_state *csp)
4074 csp->content_type = 0;
4075 csp->content_length = 0;
4076 csp->expected_content_length = 0;
4077 csp->expected_client_content_length = 0;
4078 list_remove_all(csp->headers);
4079 clear_iob(csp->iob);
4080 freez(csp->error_message);
4081 free_http_request(csp->http);
4082 destroy_list(csp->headers);
4083 destroy_list(csp->tags);
4084 #ifdef FEATURE_CLIENT_TAGS
4085 destroy_list(csp->client_tags);
4086 freez(csp->client_address);
4088 free_current_action(csp->action);
4089 if (NULL != csp->fwd)
4091 unload_forward_spec(csp->fwd);
4094 /* XXX: Store per-connection flags someplace else. */
4095 csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4096 #ifdef FEATURE_TOGGLE
4097 if (global_toggle_state)
4098 #endif /* def FEATURE_TOGGLE */
4100 csp->flags |= CSP_FLAG_TOGGLED_ON;
4103 if (csp->client_iob->eod > csp->client_iob->cur)
4105 long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4106 size_t data_length = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4108 assert(bytes_to_shift > 0);
4109 assert(data_length > 0);
4111 log_error(LOG_LEVEL_CONNECT, "Shifting %d pipelined bytes by %d bytes",
4112 data_length, bytes_to_shift);
4113 memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4114 csp->client_iob->cur = csp->client_iob->buf;
4115 assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4116 csp->client_iob->eod = csp->client_iob->buf + data_length;
4117 memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4119 csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4124 * We mainly care about resetting client_iob->cur so we don't
4125 * waste buffer space at the beginning and don't mess up the
4126 * request restoration done by cgi_show_request().
4128 * Freeing the buffer itself isn't technically necessary,
4129 * but makes debugging more convenient.
4131 clear_iob(csp->client_iob);
4134 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4137 /*********************************************************************
4141 * Description : This is little more than chat. We only "serve" to
4142 * to close (or remember) any socket that chat may have
4146 * 1 : csp = Current client state (buffers, headers, etc...)
4150 *********************************************************************/
4151 static void serve(struct client_state *csp)
4153 int config_file_change_detected = 0; /* Only used for debugging */
4154 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4155 #ifdef FEATURE_CONNECTION_SHARING
4156 static int monitor_thread_running = 0;
4157 #endif /* def FEATURE_CONNECTION_SHARING */
4158 int continue_chatting = 0;
4160 log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4161 csp->ip_addr_str, csp->cfd);
4165 unsigned int latency;
4170 * If the request has been crunched,
4171 * the calculated latency is zero.
4173 latency = (unsigned)(csp->server_connection.response_received -
4174 csp->server_connection.request_sent) / 2;
4176 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4177 && (csp->flags & CSP_FLAG_CRUNCHED)
4178 && (csp->expected_client_content_length != 0))
4180 csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4181 log_error(LOG_LEVEL_CONNECT,
4182 "Tainting client socket %d due to unread data.", csp->cfd);
4185 continue_chatting = (csp->config->feature_flags
4186 & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4187 && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4188 && (csp->cfd != JB_INVALID_SOCKET)
4189 && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4190 && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4191 || (csp->flags & CSP_FLAG_CHUNKED));
4193 if (!(csp->flags & CSP_FLAG_CRUNCHED)
4194 && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4196 if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4198 csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4200 if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4201 || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4202 || !socket_is_still_alive(csp->server_connection.sfd)
4203 || !(latency < csp->server_connection.keep_alive_timeout))
4205 log_error(LOG_LEVEL_CONNECT,
4206 "Closing server socket %d connected to %s. "
4207 "Keep-alive %u. Tainted: %u. Socket alive %u. Timeout: %u.",
4208 csp->server_connection.sfd, csp->server_connection.host,
4209 0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4210 0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4211 socket_is_still_alive(csp->server_connection.sfd),
4212 csp->server_connection.keep_alive_timeout);
4213 #ifdef FEATURE_CONNECTION_SHARING
4214 if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4216 forget_connection(csp->server_connection.sfd);
4218 #endif /* def FEATURE_CONNECTION_SHARING */
4219 close_socket(csp->server_connection.sfd);
4220 mark_connection_closed(&csp->server_connection);
4224 if (continue_chatting && any_loaded_file_changed(csp))
4226 continue_chatting = 0;
4227 config_file_change_detected = 1;
4230 if (continue_chatting)
4232 if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4233 && socket_is_still_alive(csp->cfd))
4235 log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4236 "pipelined on socket %d and the socket is still alive.",
4237 csp->requests_received_total+1, csp->cfd);
4238 prepare_csp_for_next_request(csp);
4242 if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
4244 if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4246 log_error(LOG_LEVEL_CONNECT,
4247 "Waiting for the next client request on socket %d. "
4248 "Keeping the server socket %d to %s open.",
4249 csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
4253 log_error(LOG_LEVEL_CONNECT,
4254 "Waiting for the next client request on socket %d. "
4255 "No server socket to keep open.", csp->cfd);
4259 if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4260 && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
4261 && socket_is_still_alive(csp->cfd))
4263 log_error(LOG_LEVEL_CONNECT,
4264 "Client request %u arrived in time on socket %d.",
4265 csp->requests_received_total+1, csp->cfd);
4266 prepare_csp_for_next_request(csp);
4270 #ifdef FEATURE_CONNECTION_SHARING
4271 if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4272 && (csp->server_connection.sfd != JB_INVALID_SOCKET)
4273 && (socket_is_still_alive(csp->server_connection.sfd)))
4275 time_t time_open = time(NULL) - csp->server_connection.timestamp;
4277 if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
4282 remember_connection(&csp->server_connection);
4283 csp->server_connection.sfd = JB_INVALID_SOCKET;
4284 drain_and_close_socket(csp->cfd);
4285 csp->cfd = JB_INVALID_SOCKET;
4286 privoxy_mutex_lock(&connection_reuse_mutex);
4287 if (!monitor_thread_running)
4289 monitor_thread_running = 1;
4290 privoxy_mutex_unlock(&connection_reuse_mutex);
4291 wait_for_alive_connections();
4292 privoxy_mutex_lock(&connection_reuse_mutex);
4293 monitor_thread_running = 0;
4295 privoxy_mutex_unlock(&connection_reuse_mutex);
4297 #endif /* def FEATURE_CONNECTION_SHARING */
4301 else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4303 log_error(LOG_LEVEL_CONNECT,
4304 "Closing server socket %d connected to %s. Keep-alive: %u. "
4305 "Tainted: %u. Socket alive: %u. Timeout: %u. "
4306 "Configuration file change detected: %u",
4307 csp->server_connection.sfd, csp->server_connection.host,
4308 0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4309 0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4310 socket_is_still_alive(csp->server_connection.sfd),
4311 csp->server_connection.keep_alive_timeout,
4312 config_file_change_detected);
4314 } while (continue_chatting);
4318 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4320 if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4322 #ifdef FEATURE_CONNECTION_SHARING
4323 if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4325 forget_connection(csp->server_connection.sfd);
4327 #endif /* def FEATURE_CONNECTION_SHARING */
4328 close_socket(csp->server_connection.sfd);
4331 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4332 mark_connection_closed(&csp->server_connection);
4335 if (csp->cfd != JB_INVALID_SOCKET)
4337 log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
4338 "Keep-alive: %u. Socket alive: %u. Data available: %u. "
4339 "Configuration file change detected: %u. Requests received: %u.",
4340 csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
4341 socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
4342 config_file_change_detected, csp->requests_received_total);
4343 drain_and_close_socket(csp->cfd);
4346 free_csp_resources(csp);
4348 csp->flags &= ~CSP_FLAG_ACTIVE;
4354 /*********************************************************************
4356 * Function : server_thread
4358 * Description : We only exist to call `serve' in a threaded environment.
4361 * 1 : data = Current client state (buffers, headers, etc...)
4363 * Returns : Always 0.
4365 *********************************************************************/
4366 static int32 server_thread(void *data)
4368 serve((struct client_state *) data);
4375 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
4376 /*********************************************************************
4380 * Description : Print usage info & exit.
4382 * Parameters : Pointer to argv[0] for identifying ourselves
4386 *********************************************************************/
4387 static void usage(const char *name)
4389 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
4390 "Usage: %s [--config-test] "
4393 #endif /* defined(unix) */
4396 "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
4397 #endif /* defined(unix) */
4398 "[--version] [configfile]\n",
4402 show_fuzz_usage(name);
4405 printf("Aborting\n");
4410 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
4413 #ifdef MUTEX_LOCKS_AVAILABLE
4414 /*********************************************************************
4416 * Function : privoxy_mutex_lock
4418 * Description : Locks a mutex.
4421 * 1 : mutex = The mutex to lock.
4423 * Returns : Void. May exit in case of errors.
4425 *********************************************************************/
4426 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
4428 #ifdef FEATURE_PTHREAD
4429 int err = pthread_mutex_lock(mutex);
4432 if (mutex != &log_mutex)
4434 log_error(LOG_LEVEL_FATAL,
4435 "Mutex locking failed: %s.\n", strerror(err));
4440 EnterCriticalSection(mutex);
4441 #endif /* def FEATURE_PTHREAD */
4445 /*********************************************************************
4447 * Function : privoxy_mutex_unlock
4449 * Description : Unlocks a mutex.
4452 * 1 : mutex = The mutex to unlock.
4454 * Returns : Void. May exit in case of errors.
4456 *********************************************************************/
4457 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
4459 #ifdef FEATURE_PTHREAD
4460 int err = pthread_mutex_unlock(mutex);
4463 if (mutex != &log_mutex)
4465 log_error(LOG_LEVEL_FATAL,
4466 "Mutex unlocking failed: %s.\n", strerror(err));
4471 LeaveCriticalSection(mutex);
4472 #endif /* def FEATURE_PTHREAD */
4476 /*********************************************************************
4478 * Function : privoxy_mutex_init
4480 * Description : Prepares a mutex.
4483 * 1 : mutex = The mutex to initialize.
4485 * Returns : Void. May exit in case of errors.
4487 *********************************************************************/
4488 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
4490 #ifdef FEATURE_PTHREAD
4491 int err = pthread_mutex_init(mutex, 0);
4494 printf("Fatal error. Mutex initialization failed: %s.\n",
4499 InitializeCriticalSection(mutex);
4500 #endif /* def FEATURE_PTHREAD */
4502 #endif /* def MUTEX_LOCKS_AVAILABLE */
4504 /*********************************************************************
4506 * Function : initialize_mutexes
4508 * Description : Prepares mutexes if mutex support is available.
4512 * Returns : Void, exits in case of errors.
4514 *********************************************************************/
4515 static void initialize_mutexes(void)
4517 #ifdef MUTEX_LOCKS_AVAILABLE
4519 * Prepare global mutex semaphores
4522 #ifdef LIMIT_MUTEX_NUMBER
4524 for (i = 0; i < 32; i++)
4527 for (i = 0; i < 65536; i++)
4528 #endif /* LIMIT_MUTEX_NUMBER */
4530 privoxy_mutex_init(&(certificates_mutexes[i]));
4532 privoxy_mutex_init(&rng_mutex);
4534 privoxy_mutex_init(&log_mutex);
4535 privoxy_mutex_init(&log_init_mutex);
4536 privoxy_mutex_init(&connection_reuse_mutex);
4537 #ifdef FEATURE_EXTERNAL_FILTERS
4538 privoxy_mutex_init(&external_filter_mutex);
4540 #ifdef FEATURE_CLIENT_TAGS
4541 privoxy_mutex_init(&client_tags_mutex);
4545 * XXX: The assumptions below are a bit naive
4546 * and can cause locks that aren't necessary.
4548 * For example older FreeBSD versions (< 6.x?)
4549 * have no gethostbyname_r, but gethostbyname is
4552 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
4553 privoxy_mutex_init(&resolver_mutex);
4554 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
4556 * XXX: should we use a single mutex for
4557 * localtime() and gmtime() as well?
4559 #ifndef HAVE_GMTIME_R
4560 privoxy_mutex_init(&gmtime_mutex);
4561 #endif /* ndef HAVE_GMTIME_R */
4563 #ifndef HAVE_LOCALTIME_R
4564 privoxy_mutex_init(&localtime_mutex);
4565 #endif /* ndef HAVE_GMTIME_R */
4567 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
4568 privoxy_mutex_init(&rand_mutex);
4569 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
4571 #endif /* def MUTEX_LOCKS_AVAILABLE */
4574 /*********************************************************************
4578 * Description : Load the config file and start the listen loop.
4579 * This function is a lot more *sane* with the `load_config'
4580 * and `listen_loop' functions; although it stills does
4581 * a *little* too much for my taste.
4584 * 1 : argc = Number of parameters (including $0).
4585 * 2 : argv = Array of (char *)'s to the parameters.
4587 * Returns : 1 if : can't open config file, unrecognized directive,
4588 * stats requested in multi-thread mode, can't open the
4589 * log file, can't open the jar file, listen port is invalid,
4590 * any load fails, and can't bind port.
4592 * Else main never returns, the process must be signaled
4593 * to terminate execution. Or, on Windows, use the
4594 * "File", "Exit" menu option.
4596 *********************************************************************/
4598 int real_main(int argc, char **argv)
4600 int main(int argc, char **argv)
4604 int do_config_test = 0;
4605 #ifndef HAVE_ARC4RANDOM
4606 unsigned int random_seed;
4609 struct passwd *pw = NULL;
4610 struct group *grp = NULL;
4612 char *pre_chroot_nslookup_to_load_resolver = NULL;
4615 char *fuzz_input_type = NULL;
4616 char *fuzz_input_file = NULL;
4623 #if !defined(_WIN32)
4630 /* Prepare mutexes if supported and necessary. */
4631 initialize_mutexes();
4633 /* Enable logging until further notice. */
4637 * Parse the command line arguments
4639 * XXX: simply printing usage information in case of
4640 * invalid arguments isn't particularly user friendly.
4642 while (++argc_pos < argc)
4645 /* Check to see if the service must be installed or uninstalled */
4646 if (strncmp(argv[argc_pos], "--install", 9) == 0)
4648 const char *pName = argv[argc_pos] + 9;
4651 exit((install_service(pName)) ? 0 : 1);
4653 else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
4655 const char *pName = argv[argc_pos] + 11;
4658 exit((uninstall_service(pName)) ? 0 : 1);
4660 else if (strcmp(argv[argc_pos], "--service") == 0)
4662 bRunAsService = TRUE;
4663 w32_set_service_cwd();
4664 atexit(w32_service_exit_notify);
4667 #endif /* defined(_WIN32) */
4670 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
4672 if (strcmp(argv[argc_pos], "--help") == 0)
4677 else if (strcmp(argv[argc_pos], "--version") == 0)
4679 printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
4685 else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
4687 set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
4691 else if (strcmp(argv[argc_pos], "--pidfile") == 0)
4693 if (++argc_pos == argc) usage(argv[0]);
4694 pidfile = strdup_or_die(argv[argc_pos]);
4697 else if (strcmp(argv[argc_pos], "--user") == 0)
4702 if (++argc_pos == argc) usage(argv[argc_pos]);
4704 user_arg = strdup_or_die(argv[argc_pos]);
4705 group_name = strchr(user_arg, '.');
4706 if (NULL != group_name)
4708 /* Nul-terminate the user name */
4711 /* Skip the former delimiter to actually reach the group name */
4714 grp = getgrnam(group_name);
4717 log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
4720 pw = getpwnam(user_arg);
4723 log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
4729 else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
4731 if (++argc_pos == argc) usage(argv[0]);
4732 pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
4735 else if (strcmp(argv[argc_pos], "--chroot") == 0)
4739 #endif /* defined(unix) */
4741 else if (strcmp(argv[argc_pos], "--config-test") == 0)
4746 else if (strcmp(argv[argc_pos], "--fuzz") == 0)
4749 if (argc < argc_pos + 2) usage(argv[0]);
4750 fuzz_input_type = argv[argc_pos];
4752 fuzz_input_file = argv[argc_pos];
4754 else if (strcmp(argv[argc_pos], "--stfu") == 0)
4756 set_debug_level(LOG_LEVEL_STFU);
4759 else if (argc_pos + 1 != argc)
4762 * This is neither the last command line
4763 * option, nor was it recognized before,
4764 * therefore it must be invalid.
4770 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
4772 configfile = argv[argc_pos];
4775 } /* -END- while (more arguments) */
4777 show_version(Argv[0]);
4780 if (*configfile != '/')
4782 char cwd[BUFFER_SIZE];
4784 size_t abs_file_size;
4786 /* make config-filename absolute here */
4787 if (NULL == getcwd(cwd, sizeof(cwd)))
4789 perror("failed to get current working directory");
4793 basedir = strdup_or_die(cwd);
4795 abs_file_size = strlen(cwd) + strlen(configfile) + 5;
4796 abs_file = malloc_or_die(abs_file_size);
4797 strlcpy(abs_file, basedir, abs_file_size);
4798 strlcat(abs_file, "/", abs_file_size);
4799 strlcat(abs_file, configfile, abs_file_size);
4800 configfile = abs_file;
4802 #endif /* defined unix */
4806 clients->next = NULL;
4808 /* XXX: factor out initialising after the next stable release. */
4813 #ifndef HAVE_ARC4RANDOM
4814 random_seed = (unsigned int)time(NULL);
4816 srandom(random_seed);
4819 #endif /* ifdef HAVE_RANDOM */
4820 #endif /* ifndef HAVE_ARC4RANDOM */
4823 * Unix signal handling
4825 * Catch the abort, interrupt and terminate signals for a graceful exit
4826 * Catch the hangup signal so the errlog can be reopened.
4828 * Ignore the broken pipe signal as connection failures
4829 * are handled when and where they occur without relying
4832 #if !defined(_WIN32) && !defined(__OS2__)
4835 const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
4837 for (idx = 0; idx < SZ(catched_signals); idx++)
4839 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
4840 if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
4842 if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
4843 #endif /* ifdef sun */
4845 log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
4849 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
4851 log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
4855 #else /* ifdef _WIN32 */
4856 # ifdef _WIN_CONSOLE
4858 * We *are* in a windows console app.
4859 * Print a verbose messages about FAQ's and such
4861 printf("%s", win32_blurb);
4862 # endif /* def _WIN_CONSOLE */
4863 #endif /* def _WIN32 */
4866 if (fuzz_input_type != NULL)
4868 exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
4870 log_error(LOG_LEVEL_FATAL,
4871 "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
4872 "Various data structures are static which is unsafe when using threads.");
4877 exit(NULL == load_config());
4880 /* Initialize the CGI subsystem */
4881 cgi_init_error_messages();
4884 * If running on unix and without the --no-daemon
4885 * option, become a daemon. I.e. fork, detach
4886 * from tty and get process group leadership
4895 if (pid < 0) /* error */
4900 else if (pid != 0) /* parent */
4905 * must check for errors
4906 * child died due to missing files aso
4909 wpid = waitpid(pid, &status, WNOHANG);
4921 * stderr (fd 2) will be closed later on,
4922 * when the config file has been parsed.
4928 * Reserve fd 0 and 1 to prevent abort() and friends
4929 * from sending stuff to the clients or servers.
4931 fd = open("/dev/null", O_RDONLY);
4934 log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
4938 if (dup2(fd, 0) == -1)
4940 log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
4944 fd = open("/dev/null", O_WRONLY);
4947 log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
4951 if (dup2(fd, 1) == -1)
4953 log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
4958 #ifdef FEATURE_EXTERNAL_FILTERS
4959 for (fd = 0; fd < 3; fd++)
4961 mark_socket_for_close_on_execute(fd);
4967 } /* -END- if (daemon_mode) */
4970 * As soon as we have written the PID file, we can switch
4971 * to the user and group ID indicated by the --user option
4973 if (pidfile != NULL)
4975 write_pid_file(pidfile);
4979 if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
4981 log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
4985 if (setgroups(1, &grp->gr_gid))
4987 log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
4990 else if (initgroups(pw->pw_name, pw->pw_gid))
4992 log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
4998 log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5000 /* Read the time zone file from /etc before doing chroot. */
5002 if (NULL != pre_chroot_nslookup_to_load_resolver
5003 && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5005 /* Initialize resolver library. */
5006 (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5008 if (chroot(pw->pw_dir) < 0)
5010 log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5014 log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5017 if (setuid(pw->pw_uid))
5019 log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5023 char putenv_dummy[64];
5025 strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5026 if (putenv(putenv_dummy) != 0)
5028 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5031 snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5032 if (putenv(putenv_dummy) != 0)
5034 log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5040 log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5043 #endif /* defined unix */
5046 /* This will be FALSE unless the command line specified --service
5050 /* Yup, so now we must attempt to establish a connection
5051 * with the service dispatcher. This will only work if this
5052 * process was launched by the service control manager to
5053 * actually run as a service. If this isn't the case, i've
5054 * known it take around 30 seconds or so for the call to return.
5057 /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5058 if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5060 /* Service has run, and at this point is now being stopped, so just return */
5065 printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
5067 /* An error occurred. Usually it's because --service was wrongly specified
5068 * and we were unable to connect to the Service Control Dispatcher because
5069 * it wasn't expecting us and is therefore not listening.
5071 * For now, just continue below to call the listen_loop function.
5074 #endif /* def _WIN32 */
5084 /*********************************************************************
5086 * Function : bind_port_helper
5088 * Description : Bind the listen port. Handles logging, and aborts
5092 * 1 : haddr = Host address to bind to. Use NULL to bind to
5094 * 2 : hport = Specifies port to bind to.
5095 * 3 : backlog = Listen backlog.
5097 * Returns : Port that was opened.
5099 *********************************************************************/
5100 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
5105 result = bind_port(haddr, hport, backlog, &bfd);
5109 const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
5113 log_error(LOG_LEVEL_FATAL,
5114 "can't bind to %s:%d: There may be another Privoxy "
5115 "or some other proxy running on port %d",
5116 bind_address, hport, hport);
5119 log_error(LOG_LEVEL_FATAL,
5120 "can't bind to %s:%d: The hostname is not resolvable",
5121 bind_address, hport);
5124 log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
5125 bind_address, hport);
5128 /* shouldn't get here */
5129 return JB_INVALID_SOCKET;
5134 if (bfd >= FD_SETSIZE)
5136 log_error(LOG_LEVEL_FATAL,
5137 "Bind socket number too high to use select(): %d >= %d",
5145 log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
5150 log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
5158 /*********************************************************************
5160 * Function : bind_ports_helper
5162 * Description : Bind the listen ports. Handles logging, and aborts
5166 * 1 : config = Privoxy configuration. Specifies ports
5168 * 2 : sockets = Preallocated array of opened sockets
5169 * corresponding to specification in config.
5170 * All non-opened sockets will be set to
5171 * JB_INVALID_SOCKET.
5173 * Returns : Nothing. Inspect sockets argument.
5175 *********************************************************************/
5176 static void bind_ports_helper(struct configuration_spec * config,
5177 jb_socket sockets[])
5181 for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5183 if (config->hport[i])
5185 sockets[i] = bind_port_helper(config->haddr[i],
5186 config->hport[i], config->listen_backlog);
5187 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
5188 if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
5190 struct accept_filter_arg af_options;
5191 bzero(&af_options, sizeof(af_options));
5192 strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
5193 if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
5194 sizeof(af_options)))
5196 log_error(LOG_LEVEL_ERROR,
5197 "Enabling accept filter for socket %d failed: %E", sockets[i]);
5204 sockets[i] = JB_INVALID_SOCKET;
5207 config->need_bind = 0;
5211 /*********************************************************************
5213 * Function : close_ports_helper
5215 * Description : Close listenings ports.
5218 * 1 : sockets = Array of opened and non-opened sockets to
5219 * close. All sockets will be set to
5220 * JB_INVALID_SOCKET.
5222 * Returns : Nothing.
5224 *********************************************************************/
5225 static void close_ports_helper(jb_socket sockets[])
5229 for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5231 if (JB_INVALID_SOCKET != sockets[i])
5233 close_socket(sockets[i]);
5235 sockets[i] = JB_INVALID_SOCKET;
5241 /* Without this simple workaround we get this compiler warning from _beginthread
5242 * warning C4028: formal parameter 1 different from declaration
5244 void w32_service_listen_loop(void *p)
5248 #endif /* def _WIN32 */
5251 /*********************************************************************
5253 * Function : listen_loop
5255 * Description : bind the listen port and enter a "FOREVER" listening loop.
5261 *********************************************************************/
5262 static void listen_loop(void)
5264 struct client_states *csp_list = NULL;
5265 struct client_state *csp = NULL;
5266 jb_socket bfds[MAX_LISTENING_SOCKETS];
5267 struct configuration_spec *config;
5268 unsigned int active_threads = 0;
5269 #if defined(FEATURE_PTHREAD)
5270 pthread_attr_t attrs;
5272 pthread_attr_init(&attrs);
5273 pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
5276 config = load_config();
5278 #ifdef FEATURE_CONNECTION_SHARING
5280 * XXX: Should be relocated once it no
5281 * longer needs to emit log messages.
5283 initialize_reusable_connections();
5284 #endif /* def FEATURE_CONNECTION_SHARING */
5286 bind_ports_helper(config, bfds);
5288 #ifdef FEATURE_GRACEFUL_TERMINATION
5289 while (!g_terminate)
5294 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) && !defined(__OS2__)
5295 while (waitpid(-1, NULL, WNOHANG) > 0)
5297 /* zombie children */
5299 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
5302 * Free data that was used by died threads
5304 active_threads = sweep();
5308 * Re-open the errlog after HUP signal
5310 if (received_hup_signal)
5312 if (NULL != config->logfile)
5314 init_error_log(Argv[0], config->logfile);
5316 received_hup_signal = 0;
5320 csp_list = zalloc_or_die(sizeof(*csp_list));
5321 csp = &csp_list->csp;
5323 log_error(LOG_LEVEL_CONNECT,
5324 "Waiting for the next client connection. Currently active threads: %d",
5328 * This config may be outdated, but for accept_connection()
5329 * it's fresh enough.
5331 csp->config = config;
5333 if (!accept_connection(csp, bfds))
5335 log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
5340 csp->flags |= CSP_FLAG_ACTIVE;
5341 csp->server_connection.sfd = JB_INVALID_SOCKET;
5343 csp->config = config = load_config();
5345 if (config->need_bind)
5348 * Since we were listening to the "old port", we will not see
5349 * a "listen" param change until the next request. So, at
5350 * least 1 more request must be made for us to find the new
5351 * setting. I am simply closing the old socket and binding the
5354 * Which-ever is correct, we will serve 1 more page via the
5355 * old settings. This should probably be a "show-status"
5356 * request. This should not be a so common of an operation
5357 * that this will hurt people's feelings.
5360 close_ports_helper(bfds);
5362 bind_ports_helper(config, bfds);
5365 #ifdef FEATURE_TOGGLE
5366 if (global_toggle_state)
5367 #endif /* def FEATURE_TOGGLE */
5369 csp->flags |= CSP_FLAG_TOGGLED_ON;
5372 if (run_loader(csp))
5374 log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
5375 /* Never get here - LOG_LEVEL_FATAL causes program exit */
5379 if (block_acl(NULL,csp))
5381 log_error(LOG_LEVEL_CONNECT,
5382 "Connection from %s on %s (socket %d) dropped due to ACL",
5383 csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
5384 close_socket(csp->cfd);
5385 freez(csp->ip_addr_str);
5386 freez(csp->listen_addr_str);
5390 #endif /* def FEATURE_ACL */
5392 if ((0 != config->max_client_connections)
5393 && (active_threads >= config->max_client_connections))
5395 log_error(LOG_LEVEL_CONNECT,
5396 "Rejecting connection from %s. Maximum number of connections reached.",
5398 write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
5399 strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
5400 close_socket(csp->cfd);
5401 freez(csp->ip_addr_str);
5402 freez(csp->listen_addr_str);
5407 /* add it to the list of clients */
5408 csp_list->next = clients->next;
5409 clients->next = csp_list;
5411 if (config->multi_threaded)
5415 /* this is a switch () statement in the C preprocessor - ugh */
5416 #undef SELECTED_ONE_OPTION
5418 /* Use Pthreads in preference to native code */
5419 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
5420 #define SELECTED_ONE_OPTION
5422 pthread_t the_thread;
5424 errno = pthread_create(&the_thread, &attrs,
5425 (void * (*)(void *))serve, csp);
5426 child_id = errno ? -1 : 0;
5430 #if defined(_WIN32) && !defined(_CYGWIN) && !defined(SELECTED_ONE_OPTION)
5431 #define SELECTED_ONE_OPTION
5432 child_id = _beginthread(
5433 (void (*)(void *))serve,
5438 #if defined(__OS2__) && !defined(SELECTED_ONE_OPTION)
5439 #define SELECTED_ONE_OPTION
5440 child_id = _beginthread(
5441 (void(* _Optlink)(void*))serve,
5447 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
5448 #define SELECTED_ONE_OPTION
5450 thread_id tid = spawn_thread
5451 (server_thread, "server", B_NORMAL_PRIORITY, csp);
5453 if ((tid >= 0) && (resume_thread(tid) == B_OK))
5455 child_id = (int) tid;
5464 #if !defined(SELECTED_ONE_OPTION)
5467 /* This block is only needed when using fork().
5468 * When using threads, the server thread was
5469 * created and run by the call to _beginthread().
5471 if (child_id == 0) /* child */
5474 #ifdef FEATURE_TOGGLE
5475 int inherited_toggle_state = global_toggle_state;
5476 #endif /* def FEATURE_TOGGLE */
5481 * If we've been toggled or we've blocked the request, tell Mom
5484 #ifdef FEATURE_TOGGLE
5485 if (inherited_toggle_state != global_toggle_state)
5487 rc |= RC_FLAG_TOGGLED;
5489 #endif /* def FEATURE_TOGGLE */
5491 #ifdef FEATURE_STATISTICS
5492 if (csp->flags & CSP_FLAG_REJECTED)
5494 rc |= RC_FLAG_BLOCKED;
5496 #endif /* ndef FEATURE_STATISTICS */
5500 else if (child_id > 0) /* parent */
5502 /* in a fork()'d environment, the parent's
5503 * copy of the client socket and the CSP
5507 #if !defined(_WIN32) && !defined(__CYGWIN__)
5509 wait(&child_status);
5512 * Evaluate child's return code: If the child has
5513 * - been toggled, toggle ourselves
5514 * - blocked its request, bump up the stats counter
5517 #ifdef FEATURE_TOGGLE
5518 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
5520 global_toggle_state = !global_toggle_state;
5522 #endif /* def FEATURE_TOGGLE */
5524 #ifdef FEATURE_STATISTICS
5526 if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
5530 #endif /* def FEATURE_STATISTICS */
5532 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
5533 close_socket(csp->cfd);
5534 csp->flags &= ~CSP_FLAG_ACTIVE;
5538 #undef SELECTED_ONE_OPTION
5539 /* end of cpp switch () */
5544 * Spawning the child failed, assume it's because
5545 * there are too many children running already.
5546 * XXX: If you assume ...
5548 log_error(LOG_LEVEL_ERROR,
5549 "Unable to take any additional connections: %E. Active threads: %d",
5551 write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
5552 strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
5553 close_socket(csp->cfd);
5554 csp->flags &= ~CSP_FLAG_ACTIVE;
5563 #if defined(FEATURE_PTHREAD)
5564 pthread_attr_destroy(&attrs);
5567 /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
5569 #ifdef FEATURE_HTTPS_FILTERING
5570 /* Clean up. Aim: free all memory (no leaks) */
5571 if (rng_seeded == 1)
5573 mbedtls_ctr_drbg_free(&ctr_drbg);
5574 mbedtls_entropy_free(&entropy);
5578 #ifdef FEATURE_GRACEFUL_TERMINATION
5580 log_error(LOG_LEVEL_ERROR, "Graceful termination requested");
5582 unload_current_config_file();
5583 unload_current_actions_file();
5584 unload_current_re_filterfile();
5585 #ifdef FEATURE_TRUST
5586 unload_current_trust_file();
5589 if (config->multi_threaded)
5596 } while ((clients->next != NULL) && (--i > 0));
5600 log_error(LOG_LEVEL_ERROR, "Graceful termination failed - still some live clients after 1 minute wait.");
5610 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
5611 /* Cleanup - remove taskbar icon etc. */
5616 #endif /* FEATURE_GRACEFUL_TERMINATION */