Rename process_encrypted_request() to process_encrypted_request_headers()
[privoxy.git] / jcc.c
1 /*********************************************************************
2  *
3  * File        :  $Source: /cvsroot/ijbswa/current/jcc.c,v $
4  *
5  * Purpose     :  Main file.  Contains main() method, main loop, and
6  *                the main connection-handling function.
7  *
8  * Copyright   :  Written by and Copyright (C) 2001-2021 the
9  *                Privoxy team. https://www.privoxy.org/
10  *
11  *                Based on the Internet Junkbuster originally written
12  *                by and Copyright (C) 1997 Anonymous Coders and
13  *                Junkbusters Corporation.  http://www.junkbusters.com
14  *
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.
20  *
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.
26  *
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.
32  *
33  *********************************************************************/
34
35
36 #include "config.h"
37
38 #include <stdio.h>
39 #include <sys/types.h>
40 #include <stdlib.h>
41 #include <string.h>
42 #include <signal.h>
43 #include <fcntl.h>
44 #include <errno.h>
45 #include <assert.h>
46
47 #ifdef _WIN32
48 # ifndef FEATURE_PTHREAD
49 #  ifndef STRICT
50 #   define STRICT
51 #  endif
52 #  include <winsock2.h>
53 #  include <windows.h>
54 #  include <process.h>
55 # endif /* ndef FEATURE_PTHREAD */
56
57 # include "win32.h"
58 # ifndef _WIN_CONSOLE
59 #  include "w32log.h"
60 # endif /* ndef _WIN_CONSOLE */
61 # include "w32svrapi.h"
62
63 #else /* ifndef _WIN32 */
64
65 # include <unistd.h>
66 # include <sys/wait.h>
67 # include <sys/time.h>
68 # include <sys/stat.h>
69 # include <sys/ioctl.h>
70
71 #ifdef sun
72 #include <sys/termios.h>
73 #endif /* sun */
74
75 #ifdef unix
76 #include <pwd.h>
77 #include <grp.h>
78 #endif
79
80 # include <signal.h>
81
82 # ifdef __BEOS__
83 #  include <socket.h>  /* BeOS has select() for sockets only. */
84 #  include <OS.h>      /* declarations for threads and stuff. */
85 # endif
86
87 #ifdef HAVE_POLL
88 #ifdef __GLIBC__
89 #include <sys/poll.h>
90 #else
91 #include <poll.h>
92 #endif /* def __GLIBC__ */
93 #else
94 # ifndef FD_ZERO
95 #  include <select.h>
96 # endif
97 #warning poll() appears to be unavailable. Your platform will become unsupported in the future.
98 #endif /* HAVE_POLL */
99
100 #endif
101
102 #include "project.h"
103 #include "list.h"
104 #include "jcc.h"
105 #ifdef FEATURE_HTTPS_INSPECTION
106 #include "ssl.h"
107 #endif
108 #include "filters.h"
109 #include "loaders.h"
110 #include "parsers.h"
111 #include "miscutil.h"
112 #include "errlog.h"
113 #include "jbsockets.h"
114 #include "gateway.h"
115 #include "actions.h"
116 #include "cgi.h"
117 #include "loadcfg.h"
118 #include "urlmatch.h"
119 #ifdef FEATURE_CLIENT_TAGS
120 #include "client-tags.h"
121 #endif
122
123 int daemon_mode = 1;
124 struct client_states clients[1];
125 struct file_list     files[1];
126
127 #ifdef FEATURE_STATISTICS
128 int urls_read     = 0;     /* total nr of urls read inc rejected */
129 int urls_rejected = 0;     /* total nr of urls rejected */
130 #endif /* def FEATURE_STATISTICS */
131
132 #ifdef FEATURE_GRACEFUL_TERMINATION
133 int g_terminate = 0;
134 #endif
135
136 #if !defined(_WIN32)
137 static void sig_handler(int the_signal);
138 #endif
139 static int client_protocol_is_unsupported(struct client_state *csp, char *req);
140 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
141 static jb_err get_server_headers(struct client_state *csp);
142 static const char *crunch_reason(const struct http_response *rsp);
143 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
144 static char *get_request_line(struct client_state *csp);
145 static jb_err receive_client_request(struct client_state *csp);
146 static jb_err parse_client_request(struct client_state *csp);
147 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
148 static jb_err change_request_destination(struct client_state *csp);
149 static void handle_established_connection(struct client_state *csp);
150 static void chat(struct client_state *csp);
151 static void serve(struct client_state *csp);
152 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
153 static void usage(const char *myname);
154 #endif
155 static void initialize_mutexes(void);
156 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
157 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
158 static void close_ports_helper(jb_socket sockets[]);
159 static void listen_loop(void);
160 static void serve(struct client_state *csp);
161
162 #ifdef __BEOS__
163 static int32 server_thread(void *data);
164 #endif /* def __BEOS__ */
165
166 #ifdef _WIN32
167 #define sleep(N)  Sleep(((N) * 1000))
168 #endif
169
170 #ifdef FUZZ
171 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
172 void show_fuzz_usage(const char *name);
173 #endif
174
175 #ifdef MUTEX_LOCKS_AVAILABLE
176 /*
177  * XXX: Does the locking stuff really belong in this file?
178  */
179 privoxy_mutex_t log_mutex;
180 privoxy_mutex_t log_init_mutex;
181 privoxy_mutex_t connection_reuse_mutex;
182
183 #ifdef FEATURE_HTTPS_INSPECTION
184 privoxy_mutex_t certificate_mutex;
185 privoxy_mutex_t ssl_init_mutex;
186 #endif
187
188 #ifdef FEATURE_EXTERNAL_FILTERS
189 privoxy_mutex_t external_filter_mutex;
190 #endif
191 #ifdef FEATURE_CLIENT_TAGS
192 privoxy_mutex_t client_tags_mutex;
193 #endif
194 #ifdef FEATURE_EXTENDED_STATISTICS
195 privoxy_mutex_t filter_statistics_mutex;
196 privoxy_mutex_t block_statistics_mutex;
197 #endif
198
199 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
200 privoxy_mutex_t resolver_mutex;
201 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
202
203 #ifndef HAVE_GMTIME_R
204 privoxy_mutex_t gmtime_mutex;
205 #endif /* ndef HAVE_GMTIME_R */
206
207 #ifndef HAVE_LOCALTIME_R
208 privoxy_mutex_t localtime_mutex;
209 #endif /* ndef HAVE_GMTIME_R */
210
211 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
212 privoxy_mutex_t rand_mutex;
213 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
214
215 #endif /* def MUTEX_LOCKS_AVAILABLE */
216
217 #if defined(unix)
218 const char *basedir = NULL;
219 const char *pidfile = NULL;
220 static int received_hup_signal = 0;
221 #endif /* defined unix */
222
223 /* HTTP snipplets. */
224 static const char CSUCCEED[] =
225    "HTTP/1.1 200 Connection established\r\n\r\n";
226
227 static const char CHEADER[] =
228    "HTTP/1.1 400 Invalid header received from client\r\n"
229    "Content-Type: text/plain\r\n"
230    "Connection: close\r\n\r\n"
231    "Invalid header received from client.\n";
232
233 static const char FTP_RESPONSE[] =
234    "HTTP/1.1 400 Invalid request received from client\r\n"
235    "Content-Type: text/plain\r\n"
236    "Connection: close\r\n\r\n"
237    "Invalid request. Privoxy doesn't support FTP.\n";
238
239 static const char GOPHER_RESPONSE[] =
240    "HTTP/1.1 400 Invalid request received from client\r\n"
241    "Content-Type: text/plain\r\n"
242    "Connection: close\r\n\r\n"
243    "Invalid request. Privoxy doesn't support gopher.\n";
244
245 /* XXX: should be a template */
246 static const char MISSING_DESTINATION_RESPONSE[] =
247    "HTTP/1.1 400 Bad request received from client\r\n"
248    "Content-Type: text/plain\r\n"
249    "Connection: close\r\n\r\n"
250    "Bad request. Privoxy was unable to extract the destination.\n";
251
252 /* XXX: should be a template */
253 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
254    "HTTP/1.1 502 Server or forwarder response invalid\r\n"
255    "Content-Type: text/plain\r\n"
256    "Connection: close\r\n\r\n"
257    "Bad response. The server or forwarder response doesn't look like HTTP.\n";
258
259 /* XXX: should be a template */
260 static const char MESSED_UP_REQUEST_RESPONSE[] =
261    "HTTP/1.1 400 Malformed request after rewriting\r\n"
262    "Content-Type: text/plain\r\n"
263    "Connection: close\r\n\r\n"
264    "Bad request. Messed up with header filters.\n";
265
266 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
267    "HTTP/1.1 503 Too many open connections\r\n"
268    "Content-Type: text/plain\r\n"
269    "Connection: close\r\n\r\n"
270    "Maximum number of open connections reached.\n";
271
272 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
273    "HTTP/1.1 504 Connection timeout\r\n"
274    "Content-Type: text/plain\r\n"
275    "Connection: close\r\n\r\n"
276    "The connection timed out because the client request didn't arrive in time.\n";
277
278 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
279    "HTTP/1.1 400 Failed reading client body\r\n"
280    "Content-Type: text/plain\r\n"
281    "Connection: close\r\n\r\n"
282    "Failed parsing or buffering the chunk-encoded client body.\n";
283
284 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
285    "HTTP/1.1 417 Expecting too much\r\n"
286    "Content-Type: text/plain\r\n"
287    "Connection: close\r\n\r\n"
288    "Privoxy detected an unsupported Expect header value.\n";
289
290 /* A function to crunch a response */
291 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
292
293 /* Crunch function flags */
294 #define CF_NO_FLAGS        0
295 /* Cruncher applies to forced requests as well */
296 #define CF_IGNORE_FORCE    1
297 /* Crunched requests are counted for the block statistics */
298 #define CF_COUNT_AS_REJECT 2
299
300 /* A crunch function and its flags */
301 struct cruncher
302 {
303    const crunch_func_ptr cruncher;
304    const int flags;
305 };
306
307 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
308
309 /* Complete list of cruncher functions */
310 static const struct cruncher crunchers_all[] = {
311    { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
312    { block_url,       CF_COUNT_AS_REJECT },
313 #ifdef FEATURE_TRUST
314    { trust_url,       CF_COUNT_AS_REJECT },
315 #endif /* def FEATURE_TRUST */
316    { redirect_url,    CF_NO_FLAGS  },
317    { dispatch_cgi,    CF_IGNORE_FORCE},
318    { NULL,            0 }
319 };
320
321 /* Light version, used after tags are applied */
322 static const struct cruncher crunchers_light[] = {
323    { block_url,       CF_COUNT_AS_REJECT },
324    { redirect_url,    CF_NO_FLAGS },
325    { NULL,            0 }
326 };
327
328
329 /*
330  * XXX: Don't we really mean
331  *
332  * #if defined(unix)
333  *
334  * here?
335  */
336 #if !defined(_WIN32)
337 /*********************************************************************
338  *
339  * Function    :  sig_handler
340  *
341  * Description :  Signal handler for different signals.
342  *                Exit gracefully on TERM and INT
343  *                or set a flag that will cause the errlog
344  *                to be reopened by the main thread on HUP.
345  *
346  * Parameters  :
347  *          1  :  the_signal = the signal cause this function to call
348  *
349  * Returns     :  -
350  *
351  *********************************************************************/
352 static void sig_handler(int the_signal)
353 {
354    switch(the_signal)
355    {
356       case SIGTERM:
357       case SIGINT:
358          log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
359 #if defined(unix)
360          if (pidfile)
361          {
362             unlink(pidfile);
363          }
364 #endif /* unix */
365          exit(the_signal);
366          break;
367
368       case SIGHUP:
369 #if defined(unix)
370          received_hup_signal = 1;
371 #endif
372          break;
373
374       default:
375          /*
376           * We shouldn't be here, unless we catch signals
377           * in main() that we can't handle here!
378           */
379          log_error(LOG_LEVEL_FATAL,
380             "sig_handler: exiting on unexpected signal %d", the_signal);
381    }
382    return;
383
384 }
385 #endif
386
387
388 /*********************************************************************
389  *
390  * Function    :  get_write_delay
391  *
392  * Description :  Parse the delay-response parameter.
393  *
394  * Parameters  :
395  *          1  :  csp = Current client state (buffers, headers, etc...)
396  *
397  * Returns     :  Number of milliseconds to delay writes.
398  *
399  *********************************************************************/
400 static unsigned int get_write_delay(const struct client_state *csp)
401 {
402    unsigned int delay;
403    char *endptr;
404    char *newval;
405
406    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
407    {
408       return 0;
409    }
410    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
411
412    delay = (unsigned)strtol(newval, &endptr, 0);
413    if (*endptr != '\0')
414    {
415       log_error(LOG_LEVEL_FATAL,
416          "Invalid delay-response{} parameter: '%s'", newval);
417    }
418
419    return delay;
420
421 }
422
423
424 /*********************************************************************
425  *
426  * Function    :  client_protocol_is_unsupported
427  *
428  * Description :  Checks if the client used a known unsupported
429  *                protocol and deals with it by sending an error
430  *                response.
431  *
432  * Parameters  :
433  *          1  :  csp = Current client state (buffers, headers, etc...)
434  *          2  :  req = the first request line send by the client
435  *
436  * Returns     :  TRUE if an error response has been generated, or
437  *                FALSE if the request doesn't look invalid.
438  *
439  *********************************************************************/
440 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
441 {
442    /*
443     * If it's a FTP or gopher request, we don't support it.
444     *
445     * These checks are better than nothing, but they might
446     * not work in all configurations and some clients might
447     * have problems digesting the answer.
448     *
449     * They should, however, never cause more problems than
450     * Privoxy's old behaviour (returning the misleading HTML
451     * error message:
452     *
453     * "Could not resolve http://(ftp|gopher)://example.org").
454     */
455    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
456    {
457       const char *response = NULL;
458       const char *protocol = NULL;
459
460       if (!strncmpic(req, "GET ftp://", 10))
461       {
462          response = FTP_RESPONSE;
463          protocol = "FTP";
464       }
465       else
466       {
467          response = GOPHER_RESPONSE;
468          protocol = "GOPHER";
469       }
470       log_error(LOG_LEVEL_ERROR,
471          "%s tried to use Privoxy as %s proxy: %s",
472          csp->ip_addr_str, protocol, req);
473       log_error(LOG_LEVEL_CLF,
474          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
475       freez(req);
476
477 #ifdef FEATURE_HTTPS_INSPECTION
478       if (client_use_ssl(csp))
479       {
480          ssl_send_data_delayed(&(csp->ssl_client_attr),
481             (const unsigned char *)response, strlen(response),
482             get_write_delay(csp));
483       }
484       else
485 #endif
486       {
487          write_socket_delayed(csp->cfd, response, strlen(response),
488             get_write_delay(csp));
489       }
490
491       return TRUE;
492    }
493
494    return FALSE;
495 }
496
497
498 /*********************************************************************
499  *
500  * Function    :  client_has_unsupported_expectations
501  *
502  * Description :  Checks if the client used an unsupported expectation
503  *                in which case an error message is delivered.
504  *
505  * Parameters  :
506  *          1  :  csp = Current client state (buffers, headers, etc...)
507  *
508  * Returns     :  TRUE if an error response has been generated, or
509  *                FALSE if the request doesn't look invalid.
510  *
511  *********************************************************************/
512 static int client_has_unsupported_expectations(const struct client_state *csp)
513 {
514    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
515    {
516       log_error(LOG_LEVEL_ERROR,
517          "Rejecting request from client %s with unsupported Expect header value",
518          csp->ip_addr_str);
519       log_error(LOG_LEVEL_CLF,
520          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
521       write_socket_delayed(csp->cfd,
522          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
523          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
524          get_write_delay(csp));
525
526       return TRUE;
527    }
528
529    return FALSE;
530
531 }
532
533
534 /*********************************************************************
535  *
536  * Function    :  get_request_destination_elsewhere
537  *
538  * Description :  If the client's request was redirected into
539  *                Privoxy without the client's knowledge,
540  *                the request line lacks the destination host.
541  *
542  *                This function tries to get it elsewhere,
543  *                provided accept-intercepted-requests is enabled.
544  *
545  *                "Elsewhere" currently only means "Host: header",
546  *                but in the future we may ask the redirecting
547  *                packet filter to look the destination up.
548  *
549  *                If the destination stays unknown, an error
550  *                response is send to the client and headers
551  *                are freed so that chat() can return directly.
552  *
553  * Parameters  :
554  *          1  :  csp = Current client state (buffers, headers, etc...)
555  *          2  :  headers = a header list
556  *
557  * Returns     :  JB_ERR_OK if the destination is now known, or
558  *                JB_ERR_PARSE if it isn't.
559  *
560  *********************************************************************/
561 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
562 {
563    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
564    {
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);
571
572       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
573          get_write_delay(csp));
574       destroy_list(headers);
575
576       return JB_ERR_PARSE;
577    }
578    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
579    {
580       /* Split the domain we just got for pattern matching */
581       init_domain_components(csp->http);
582
583       return JB_ERR_OK;
584    }
585    else
586    {
587       /* We can't work without destination. Go spread the news.*/
588
589       /* XXX: Use correct size */
590       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
591          csp->ip_addr_str, csp->http->cmd);
592       log_error(LOG_LEVEL_ERROR,
593          "Privoxy was unable to get the destination for %s's request: %s",
594          csp->ip_addr_str, csp->http->cmd);
595
596       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
597          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
598       destroy_list(headers);
599
600       return JB_ERR_PARSE;
601    }
602    /*
603     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
604     * to get the destination IP address, use it as host directly
605     * or do a reverse DNS lookup first.
606     */
607 }
608
609
610 /*********************************************************************
611  *
612  * Function    :  get_server_headers
613  *
614  * Description :  Parses server headers in iob and fills them
615  *                into csp->headers so that they can later be
616  *                handled by sed().
617  *
618  * Parameters  :
619  *          1  :  csp = Current client state (buffers, headers, etc...)
620  *
621  * Returns     :  JB_ERR_OK if everything went fine, or
622  *                JB_ERR_PARSE if the headers were incomplete.
623  *
624  *********************************************************************/
625 static jb_err get_server_headers(struct client_state *csp)
626 {
627    int continue_hack_in_da_house = 0;
628    char * header;
629
630    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
631    {
632       if (header == NULL)
633       {
634          /*
635           * continue hack in da house. Ignore the ending of
636           * this head and continue enlisting header lines.
637           * The reason is described below.
638           */
639          enlist(csp->headers, "");
640          continue_hack_in_da_house = 0;
641          continue;
642       }
643       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
644       {
645          /*
646           * It's a bodyless continue response, don't
647           * stop header parsing after reaching its end.
648           *
649           * As a result Privoxy will concatenate the
650           * next response's head and parse and deliver
651           * the headers as if they belonged to one request.
652           *
653           * The client will separate them because of the
654           * empty line between them.
655           *
656           * XXX: What we're doing here is clearly against
657           * the intended purpose of the continue header,
658           * and under some conditions (HTTP/1.0 client request)
659           * it's a standard violation.
660           *
661           * Anyway, "sort of against the spec" is preferable
662           * to "always getting confused by Continue responses"
663           * (Privoxy's behaviour before this hack was added)
664           */
665          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
666          continue_hack_in_da_house = 1;
667       }
668       else if (*header == '\0')
669       {
670          /*
671           * If the header is empty, but the Continue hack
672           * isn't active, we can assume that we reached the
673           * end of the buffer before we hit the end of the
674           * head.
675           *
676           * Inform the caller an let it decide how to handle it.
677           */
678          return JB_ERR_PARSE;
679       }
680
681       if (JB_ERR_MEMORY == enlist(csp->headers, header))
682       {
683          /*
684           * XXX: Should we quit the request and return a
685           * out of memory error page instead?
686           */
687          log_error(LOG_LEVEL_ERROR,
688             "Out of memory while enlisting server headers. %s lost.",
689             header);
690       }
691       freez(header);
692    }
693
694    return JB_ERR_OK;
695 }
696
697
698 /*********************************************************************
699  *
700  * Function    :  crunch_reason
701  *
702  * Description :  Translates the crunch reason code into a string.
703  *
704  * Parameters  :
705  *          1  :  rsp = a http_response
706  *
707  * Returns     :  A string with the crunch reason or an error description.
708  *
709  *********************************************************************/
710 static const char *crunch_reason(const struct http_response *rsp)
711 {
712    char * reason = NULL;
713
714    assert(rsp != NULL);
715    if (rsp == NULL)
716    {
717       return "Internal error while searching for crunch reason";
718    }
719
720    switch (rsp->crunch_reason)
721    {
722       case UNSUPPORTED:
723          reason = "Unsupported HTTP feature";
724          break;
725       case BLOCKED:
726          reason = "Blocked";
727          break;
728       case UNTRUSTED:
729          reason = "Untrusted";
730          break;
731       case REDIRECTED:
732          reason = "Redirected";
733          break;
734       case CGI_CALL:
735          reason = "CGI Call";
736          break;
737       case NO_SUCH_DOMAIN:
738          reason = "DNS failure";
739          break;
740       case FORWARDING_FAILED:
741          reason = "Forwarding failed";
742          break;
743       case CONNECT_FAILED:
744          reason = "Connection failure";
745          break;
746       case OUT_OF_MEMORY:
747          reason = "Out of memory (may mask other reasons)";
748          break;
749       case CONNECTION_TIMEOUT:
750          reason = "Connection timeout";
751          break;
752       case NO_SERVER_DATA:
753          reason = "No server data received";
754          break;
755       default:
756          reason = "No reason recorded";
757          break;
758    }
759
760    return reason;
761 }
762
763
764 /*********************************************************************
765  *
766  * Function    :  log_applied_actions
767  *
768  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
769  *                enabled.
770  *
771  * Parameters  :
772  *          1  :  actions = Current action spec to log
773  *
774  * Returns     :  Nothing.
775  *
776  *********************************************************************/
777 static void log_applied_actions(const struct current_action_spec *actions)
778 {
779    /*
780     * The conversion to text requires lots of memory allocations so
781     * we only do the conversion if the user is actually interested.
782     */
783    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
784    {
785       char *actions_as_text = actions_to_line_of_text(actions);
786       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
787       freez(actions_as_text);
788    }
789 }
790
791
792 /*********************************************************************
793  *
794  * Function    :  send_crunch_response
795  *
796  * Description :  Delivers already prepared response for
797  *                intercepted requests, logs the interception
798  *                and frees the response.
799  *
800  * Parameters  :
801  *          1  :  csp = Current client state (buffers, headers, etc...)
802  *          2  :  rsp = Fully prepared response. Will be freed on exit.
803  *
804  * Returns     :  Nothing.
805  *
806  *********************************************************************/
807 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
808 {
809       const struct http_request *http = csp->http;
810       char status_code[4];
811
812       assert(rsp != NULL);
813       assert(rsp->head != NULL);
814
815       if (rsp == NULL)
816       {
817          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
818       }
819
820       /*
821        * Extract the status code from the actual head
822        * that will be send to the client. It is the only
823        * way to get it right for all requests, including
824        * the fixed ones for out-of-memory problems.
825        *
826        * A head starts like this: 'HTTP/1.1 200...'
827        *                           0123456789|11
828        *                                     10
829        */
830       status_code[0] = rsp->head[9];
831       status_code[1] = rsp->head[10];
832       status_code[2] = rsp->head[11];
833       status_code[3] = '\0';
834
835       /* Log that the request was crunched and why. */
836       log_applied_actions(csp->action);
837 #ifdef FEATURE_HTTPS_INSPECTION
838       if (client_use_ssl(csp))
839       {
840          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
841             http->hostport, http->path);
842          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
843             csp->ip_addr_str, http->gpc, http->hostport, http->path,
844             http->version, status_code, rsp->content_length);
845       }
846       else
847 #endif
848       {
849          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
850          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
851             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
852       }
853       /* Write the answer to the client */
854 #ifdef FEATURE_HTTPS_INSPECTION
855       if (client_use_ssl(csp))
856       {
857          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
858                 (const unsigned char *)rsp->head, rsp->head_length,
859                 get_write_delay(csp)) < 0)
860           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
861                 (const unsigned char *)rsp->body, rsp->content_length,
862                 get_write_delay(csp)) < 0))
863          {
864             /* There is nothing we can do about it. */
865             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
866                "for https://%s%s through client socket %d using TLS/SSL",
867                http->hostport, http->url, csp->cfd);
868          }
869       }
870       else
871 #endif
872       {
873          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
874                 get_write_delay(csp))
875           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
876                 get_write_delay(csp)))
877          {
878             /* There is nothing we can do about it. */
879             log_error(LOG_LEVEL_CONNECT,
880                "Couldn't deliver the error message for %s through client socket %d: %E",
881                http->url, csp->cfd);
882          }
883       }
884
885       /* Clean up and return */
886       if (cgi_error_memory() != rsp)
887       {
888          free_http_response(rsp);
889       }
890       return;
891 }
892
893
894 /*********************************************************************
895  *
896  * Function    :  crunch_response_triggered
897  *
898  * Description :  Checks if the request has to be crunched,
899  *                and delivers the crunch response if necessary.
900  *
901  * Parameters  :
902  *          1  :  csp = Current client state (buffers, headers, etc...)
903  *          2  :  crunchers = list of cruncher functions to run
904  *
905  * Returns     :  TRUE if the request was answered with a crunch response
906  *                FALSE otherwise.
907  *
908  *********************************************************************/
909 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
910 {
911    struct http_response *rsp = NULL;
912    const struct cruncher *c;
913
914    /*
915     * If CGI request crunching is disabled,
916     * check the CGI dispatcher out of order to
917     * prevent unintentional blocks or redirects.
918     */
919    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
920        && (NULL != (rsp = dispatch_cgi(csp))))
921    {
922       /* Deliver, log and free the interception response. */
923       send_crunch_response(csp, rsp);
924       csp->flags |= CSP_FLAG_CRUNCHED;
925       return TRUE;
926    }
927
928    for (c = crunchers; c->cruncher != NULL; c++)
929    {
930       /*
931        * Check the cruncher if either Privoxy is toggled
932        * on and the request isn't forced, or if the cruncher
933        * applies to forced requests as well.
934        */
935       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
936           !(csp->flags & CSP_FLAG_FORCED)) ||
937           (c->flags & CF_IGNORE_FORCE))
938       {
939          rsp = c->cruncher(csp);
940          if (NULL != rsp)
941          {
942             /* Deliver, log and free the interception response. */
943             send_crunch_response(csp, rsp);
944             csp->flags |= CSP_FLAG_CRUNCHED;
945 #ifdef FEATURE_STATISTICS
946             if (c->flags & CF_COUNT_AS_REJECT)
947             {
948                csp->flags |= CSP_FLAG_REJECTED;
949             }
950 #endif /* def FEATURE_STATISTICS */
951
952             return TRUE;
953          }
954       }
955    }
956
957    return FALSE;
958 }
959
960
961 /*********************************************************************
962  *
963  * Function    :  build_request_line
964  *
965  * Description :  Builds the HTTP request line.
966  *
967  *                If a HTTP forwarder is used it expects the whole URL,
968  *                web servers only get the path.
969  *
970  * Parameters  :
971  *          1  :  csp = Current client state (buffers, headers, etc...)
972  *          2  :  fwd = The forwarding spec used for the request.
973  *                      Can be NULL.
974  *          3  :  request_line = The old request line which will be replaced.
975  *
976  * Returns     :  Nothing. Terminates in case of memory problems.
977  *
978  *********************************************************************/
979 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
980 {
981    struct http_request *http = csp->http;
982
983    /*
984     * Downgrade http version from 1.1 to 1.0
985     * if +downgrade action applies.
986     */
987    if ((csp->action->flags & ACTION_DOWNGRADE)
988      && (!strcmpic(http->version, "HTTP/1.1")))
989    {
990       freez(http->version);
991       http->version = strdup_or_die("HTTP/1.0");
992    }
993
994    /*
995     * Rebuild the request line.
996     */
997    freez(*request_line);
998 #ifdef FEATURE_HTTPS_INSPECTION
999    if (fwd != NULL && fwd->forward_host &&
1000        fwd->type != FORWARD_WEBSERVER && client_use_ssl(csp))
1001    {
1002       *request_line = strdup("CONNECT ");
1003    }
1004    else
1005 #endif
1006    {
1007       *request_line = strdup(http->gpc);
1008       string_append(request_line, " ");
1009    }
1010
1011    if (fwd != NULL && fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1012    {
1013 #ifdef FEATURE_HTTPS_INSPECTION
1014       if (client_use_ssl(csp))
1015       {
1016          char port_string[10];
1017
1018          string_append(request_line, http->host);
1019          snprintf(port_string, sizeof(port_string), ":%d", http->port);
1020          string_append(request_line, port_string);
1021       }
1022       else
1023 #endif
1024       {
1025          string_append(request_line, http->url);
1026       }
1027    }
1028    else
1029    {
1030       string_append(request_line, http->path);
1031    }
1032    string_append(request_line, " ");
1033    string_append(request_line, http->version);
1034
1035    if (*request_line == NULL)
1036    {
1037       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1038    }
1039    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1040 }
1041
1042
1043 /*********************************************************************
1044  *
1045  * Function    :  change_request_destination
1046  *
1047  * Description :  Parse a (rewritten) request line and regenerate
1048  *                the http request data.
1049  *
1050  * Parameters  :
1051  *          1  :  csp = Current client state (buffers, headers, etc...)
1052  *
1053  * Returns     :  Forwards the parse_http_request() return code.
1054  *                Terminates in case of memory problems.
1055  *
1056  *********************************************************************/
1057 static jb_err change_request_destination(struct client_state *csp)
1058 {
1059    struct http_request *http = csp->http;
1060    jb_err err;
1061
1062    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1063       csp->headers->first->str);
1064    free_http_request(http);
1065    err = parse_http_request(csp->headers->first->str, http);
1066    if (JB_ERR_OK != err)
1067    {
1068       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1069          jb_err_to_string(err));
1070    }
1071    if (http->ssl && strcmpic(csp->http->gpc, "CONNECT"))
1072    {
1073       /*
1074        * A client header filter changed the request URL from
1075        * http:// to https:// which we currently don't support.
1076        */
1077       log_error(LOG_LEVEL_ERROR, "Changing the request destination from http "
1078          "to https behind the client's back currently isn't supported.");
1079       return JB_ERR_PARSE;
1080    }
1081
1082    return err;
1083 }
1084
1085
1086 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1087 /*********************************************************************
1088  *
1089  * Function    :  server_response_is_complete
1090  *
1091  * Description :  Determines whether we should stop reading
1092  *                from the server socket.
1093  *
1094  * Parameters  :
1095  *          1  :  csp = Current client state (buffers, headers, etc...)
1096  *          2  :  content_length = Length of content received so far.
1097  *
1098  * Returns     :  TRUE if the response is complete,
1099  *                FALSE otherwise.
1100  *
1101  *********************************************************************/
1102 static int server_response_is_complete(struct client_state *csp,
1103    unsigned long long content_length)
1104 {
1105    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1106
1107    if (!strcmpic(csp->http->gpc, "HEAD"))
1108    {
1109       /*
1110        * "HEAD" implies no body, we are thus expecting
1111        * no content. XXX: incomplete "list" of methods?
1112        */
1113       csp->expected_content_length = 0;
1114       content_length_known = TRUE;
1115       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1116    }
1117
1118    if (csp->http->status == 204 || csp->http->status == 304)
1119    {
1120       /*
1121        * Expect no body. XXX: incomplete "list" of status codes?
1122        */
1123       csp->expected_content_length = 0;
1124       content_length_known = TRUE;
1125       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1126    }
1127
1128    return (content_length_known && ((0 == csp->expected_content_length)
1129             || (csp->expected_content_length <= content_length)));
1130 }
1131
1132
1133 #ifdef FEATURE_CONNECTION_SHARING
1134 /*********************************************************************
1135  *
1136  * Function    :  wait_for_alive_connections
1137  *
1138  * Description :  Waits for alive connections to timeout.
1139  *
1140  * Parameters  :  N/A
1141  *
1142  * Returns     :  N/A
1143  *
1144  *********************************************************************/
1145 static void wait_for_alive_connections(void)
1146 {
1147    int connections_alive = close_unusable_connections();
1148
1149    while (0 < connections_alive)
1150    {
1151       log_error(LOG_LEVEL_CONNECT,
1152          "Waiting for %d connections to timeout.",
1153          connections_alive);
1154       sleep(60);
1155       connections_alive = close_unusable_connections();
1156    }
1157
1158    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1159
1160 }
1161 #endif /* def FEATURE_CONNECTION_SHARING */
1162
1163
1164 /*********************************************************************
1165  *
1166  * Function    :  save_connection_destination
1167  *
1168  * Description :  Remembers a connection for reuse later on.
1169  *
1170  * Parameters  :
1171  *          1  :  sfd  = Open socket to remember.
1172  *          2  :  http = The destination for the connection.
1173  *          3  :  fwd  = The forwarder settings used.
1174  *          4  :  server_connection  = storage.
1175  *
1176  * Returns     : void
1177  *
1178  *********************************************************************/
1179 static void save_connection_destination(jb_socket sfd,
1180                                         const struct http_request *http,
1181                                         const struct forward_spec *fwd,
1182                                         struct reusable_connection *server_connection)
1183 {
1184    assert(sfd != JB_INVALID_SOCKET);
1185    assert(NULL != http->host);
1186
1187    server_connection->sfd = sfd;
1188    server_connection->host = strdup_or_die(http->host);
1189    server_connection->port = http->port;
1190
1191    assert(NULL != fwd);
1192    assert(server_connection->gateway_host == NULL);
1193    assert(server_connection->gateway_port == 0);
1194    assert(server_connection->forwarder_type == 0);
1195    assert(server_connection->forward_host == NULL);
1196    assert(server_connection->forward_port == 0);
1197
1198    server_connection->forwarder_type = fwd->type;
1199    if (NULL != fwd->gateway_host)
1200    {
1201       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1202    }
1203    else
1204    {
1205       server_connection->gateway_host = NULL;
1206    }
1207    server_connection->gateway_port = fwd->gateway_port;
1208    if (NULL != fwd->auth_username)
1209    {
1210       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1211    }
1212    else
1213    {
1214       server_connection->auth_username = NULL;
1215    }
1216    if (NULL != fwd->auth_password)
1217    {
1218       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1219    }
1220    else
1221    {
1222       server_connection->auth_password = NULL;
1223    }
1224
1225    if (NULL != fwd->forward_host)
1226    {
1227       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1228    }
1229    else
1230    {
1231       server_connection->forward_host = NULL;
1232    }
1233    server_connection->forward_port = fwd->forward_port;
1234 }
1235 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1236
1237
1238 /*********************************************************************
1239  *
1240  * Function    : verify_request_length
1241  *
1242  * Description : Checks if we already got the whole client requests
1243  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1244  *               we do.
1245  *
1246  *               Data that doesn't belong to the current request is
1247  *               either thrown away to let the client retry on a clean
1248  *               socket, or stashed to be dealt with after the current
1249  *               request is served.
1250  *
1251  * Parameters  :
1252  *          1  :  csp = Current client state (buffers, headers, etc...)
1253  *
1254  * Returns     :  void
1255  *
1256  *********************************************************************/
1257 static void verify_request_length(struct client_state *csp)
1258 {
1259    unsigned long long buffered_request_bytes =
1260       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1261
1262    if ((csp->expected_client_content_length != 0)
1263       && (buffered_request_bytes != 0))
1264    {
1265       if (csp->expected_client_content_length >= buffered_request_bytes)
1266       {
1267          csp->expected_client_content_length -= buffered_request_bytes;
1268          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1269             "to account for the %llu ones we already got.",
1270             csp->expected_client_content_length, buffered_request_bytes);
1271       }
1272       else
1273       {
1274          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1275          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1276          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1277             "Marking the server socket tainted after throwing %llu bytes away.",
1278             buffered_request_bytes - csp->expected_client_content_length);
1279          csp->expected_client_content_length = 0;
1280          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1281       }
1282
1283       if (csp->expected_client_content_length == 0)
1284       {
1285          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1286       }
1287    }
1288
1289    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1290       && ((csp->client_iob->cur < csp->client_iob->eod)
1291          || (csp->expected_client_content_length != 0)))
1292    {
1293       if (strcmpic(csp->http->gpc, "GET")
1294          && strcmpic(csp->http->gpc, "HEAD")
1295          && strcmpic(csp->http->gpc, "TRACE")
1296          && strcmpic(csp->http->gpc, "OPTIONS")
1297          && strcmpic(csp->http->gpc, "DELETE"))
1298       {
1299          /* XXX: this is an incomplete hack */
1300          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1301          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1302       }
1303       else
1304       {
1305          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1306
1307          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1308          {
1309             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1310             log_error(LOG_LEVEL_CONNECT,
1311                "Possible pipeline attempt detected. The connection will not "
1312                "be kept alive and we will only serve the first request.");
1313             /* Nuke the pipelined requests from orbit, just to be sure. */
1314             clear_iob(csp->client_iob);
1315          }
1316          else
1317          {
1318             /*
1319              * Keep the pipelined data around for now, we'll deal with
1320              * it once we're done serving the current request.
1321              */
1322             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1323             assert(csp->client_iob->eod >= csp->client_iob->cur);
1324             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1325                "%d bytes of pipelined data received.",
1326                (int)(csp->client_iob->eod - csp->client_iob->cur));
1327          }
1328       }
1329    }
1330    else
1331    {
1332       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1333       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1334    }
1335 }
1336
1337
1338 /*********************************************************************
1339  *
1340  * Function    :  mark_server_socket_tainted
1341  *
1342  * Description :  Makes sure we don't reuse a server socket
1343  *                (if we didn't read everything the server sent
1344  *                us reusing the socket would lead to garbage).
1345  *
1346  * Parameters  :
1347  *          1  :  csp = Current client state (buffers, headers, etc...)
1348  *
1349  * Returns     :  void.
1350  *
1351  *********************************************************************/
1352 static void mark_server_socket_tainted(struct client_state *csp)
1353 {
1354    /*
1355     * For consistency we always mark the server socket
1356     * tainted, however, to reduce the log noise we only
1357     * emit a log message if the server socket could have
1358     * actually been reused.
1359     */
1360    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1361       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1362    {
1363       log_error(LOG_LEVEL_CONNECT,
1364          "Marking the server socket %d tainted.",
1365          csp->server_connection.sfd);
1366    }
1367    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1368 }
1369
1370 /*********************************************************************
1371  *
1372  * Function    :  get_request_line
1373  *
1374  * Description : Read the client request line.
1375  *
1376  * Parameters  :
1377  *          1  :  csp = Current client state (buffers, headers, etc...)
1378  *
1379  * Returns     :  Pointer to request line or NULL in case of errors.
1380  *
1381  *********************************************************************/
1382 static char *get_request_line(struct client_state *csp)
1383 {
1384    char buf[BUFFER_SIZE];
1385    char *request_line = NULL;
1386    int len;
1387
1388    memset(buf, 0, sizeof(buf));
1389
1390    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1391    {
1392       /*
1393        * If there are multiple pipelined requests waiting,
1394        * the flag will be set again once the next request
1395        * has been parsed.
1396        */
1397       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1398
1399       request_line = get_header(csp->client_iob);
1400       if ((NULL != request_line) && ('\0' != *request_line))
1401       {
1402          return request_line;
1403       }
1404       else
1405       {
1406          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1407             "received yet. Continuing reading from %d.", csp->cfd);
1408       }
1409    }
1410
1411    do
1412    {
1413       if (
1414 #ifdef FUZZ
1415           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1416 #endif
1417           !data_is_available(csp->cfd, csp->config->socket_timeout)
1418           )
1419       {
1420          if (socket_is_still_alive(csp->cfd))
1421          {
1422             log_error(LOG_LEVEL_CONNECT,
1423                "No request line on socket %d received in time. Timeout: %d.",
1424                csp->cfd, csp->config->socket_timeout);
1425             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1426                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1427                get_write_delay(csp));
1428          }
1429          else
1430          {
1431             log_error(LOG_LEVEL_CONNECT,
1432                "The client side of the connection on socket %d got "
1433                "closed without sending a complete request line.", csp->cfd);
1434          }
1435          return NULL;
1436       }
1437
1438       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1439
1440       if (len <= 0) return NULL;
1441
1442       /*
1443        * If there is no memory left for buffering the
1444        * request, there is nothing we can do but hang up
1445        */
1446       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1447       {
1448          return NULL;
1449       }
1450
1451       request_line = get_header(csp->client_iob);
1452
1453    } while ((NULL != request_line) && ('\0' == *request_line));
1454
1455    return request_line;
1456
1457 }
1458
1459 enum chunk_status
1460 {
1461    CHUNK_STATUS_MISSING_DATA,
1462    CHUNK_STATUS_BODY_COMPLETE,
1463    CHUNK_STATUS_PARSE_ERROR
1464 };
1465
1466
1467 /*********************************************************************
1468  *
1469  * Function    :  chunked_body_is_complete
1470  *
1471  * Description :  Figures out whether or not a chunked body is complete.
1472  *
1473  *                Currently it always starts at the beginning of the
1474  *                buffer which is somewhat wasteful and prevents Privoxy
1475  *                from starting to forward the correctly parsed chunks
1476  *                as soon as theoretically possible.
1477  *
1478  *                Should be modified to work with a common buffer,
1479  *                and allow the caller to skip already parsed chunks.
1480  *
1481  *                This would allow the function to be used for unbuffered
1482  *                response bodies as well.
1483  *
1484  * Parameters  :
1485  *          1  :  iob = Buffer with the body to check.
1486  *          2  :  length = Length of complete body
1487  *
1488  * Returns     :  Enum with the result of the check.
1489  *
1490  *********************************************************************/
1491 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1492 {
1493    unsigned int chunksize;
1494    char *p = iob->cur;
1495
1496    do
1497    {
1498       /*
1499        * We need at least a single digit, followed by "\r\n",
1500        * followed by an unknown amount of data, followed by "\r\n".
1501        */
1502       if (p + 5 > iob->eod)
1503       {
1504          return CHUNK_STATUS_MISSING_DATA;
1505       }
1506       if (sscanf(p, "%x", &chunksize) != 1)
1507       {
1508          return CHUNK_STATUS_PARSE_ERROR;
1509       }
1510
1511       /*
1512        * We want at least a single digit, followed by "\r\n",
1513        * followed by the specified amount of data, followed by "\r\n".
1514        */
1515       if (p + chunksize + 5 > iob->eod)
1516       {
1517          return CHUNK_STATUS_MISSING_DATA;
1518       }
1519
1520       /* Skip chunk-size. */
1521       p = strstr(p, "\r\n");
1522       if (NULL == p)
1523       {
1524          return CHUNK_STATUS_PARSE_ERROR;
1525       }
1526       /* Move beyond the chunkdata. */
1527       p += 2 + chunksize;
1528
1529       /* Make sure we're still within the buffer and have two bytes left */
1530       if (p + 2 > iob->eod)
1531       {
1532          return CHUNK_STATUS_MISSING_DATA;
1533       }
1534
1535       /* There should be another "\r\n" to skip */
1536       if (memcmp(p, "\r\n", 2))
1537       {
1538          return CHUNK_STATUS_PARSE_ERROR;
1539       }
1540       p += 2;
1541    } while (chunksize > 0U);
1542
1543    *length = (size_t)(p - iob->cur);
1544    assert(*length <= (size_t)(iob->eod - iob->cur));
1545    assert(p <= iob->eod);
1546
1547    return CHUNK_STATUS_BODY_COMPLETE;
1548
1549 }
1550
1551
1552 /*********************************************************************
1553  *
1554  * Function    : receive_chunked_client_request_body
1555  *
1556  * Description : Read the chunk-encoded client request body.
1557  *               Failures are dealt with.
1558  *
1559  * Parameters  :
1560  *          1  :  csp = Current client state (buffers, headers, etc...)
1561  *
1562  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1563  *
1564  *********************************************************************/
1565 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1566 {
1567    size_t body_length;
1568    enum chunk_status status;
1569
1570    while (CHUNK_STATUS_MISSING_DATA ==
1571       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1572    {
1573       char buf[BUFFER_SIZE];
1574       int len;
1575
1576       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1577       {
1578          log_error(LOG_LEVEL_ERROR,
1579             "Timeout while waiting for the client body.");
1580          break;
1581       }
1582       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1583       if (len <= 0)
1584       {
1585          log_error(LOG_LEVEL_ERROR,
1586             "Reading the client body failed: %E");
1587          break;
1588       }
1589       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1590       {
1591          break;
1592       }
1593    }
1594    if (status != CHUNK_STATUS_BODY_COMPLETE)
1595    {
1596       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1597          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1598       log_error(LOG_LEVEL_CLF,
1599          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1600       return JB_ERR_PARSE;
1601    }
1602    log_error(LOG_LEVEL_CONNECT,
1603       "Chunked client body completely read. Length: %lu", body_length);
1604    csp->expected_client_content_length = body_length;
1605
1606    return JB_ERR_OK;
1607
1608 }
1609
1610
1611 #ifdef FUZZ
1612 /*********************************************************************
1613  *
1614  * Function    :  fuzz_chunked_transfer_encoding
1615  *
1616  * Description :  Treat the fuzzed input as chunked transfer encoding
1617  *                to check and dechunk.
1618  *
1619  * Parameters  :
1620  *          1  :  csp      = Used to store the data.
1621  *          2  :  fuzz_input_file = File to read the input from.
1622  *
1623  * Returns     : Result of dechunking
1624  *
1625  *********************************************************************/
1626 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1627 {
1628    size_t length;
1629    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1630    enum chunk_status status;
1631
1632    status = chunked_body_is_complete(csp->iob, &length);
1633    if (CHUNK_STATUS_BODY_COMPLETE != status)
1634    {
1635       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1636    }
1637
1638    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1639
1640 }
1641
1642
1643 /*********************************************************************
1644  *
1645  * Function    : fuzz_client_request
1646  *
1647  * Description : Try to get a client request from the fuzzed input.
1648  *
1649  * Parameters  :
1650  *          1  :  csp = Current client state (buffers, headers, etc...)
1651  *          2  :  fuzz_input_file = File to read the input from.
1652  *
1653  * Returns     :  Result of fuzzing.
1654  *
1655  *********************************************************************/
1656 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1657 {
1658    jb_err err;
1659
1660    csp->cfd = 0;
1661    csp->ip_addr_str = "fuzzer";
1662
1663    if (strcmp(fuzz_input_file, "-") != 0)
1664    {
1665       log_error(LOG_LEVEL_FATAL,
1666          "Fuzzed client requests can currently only be read from stdin (-).");
1667    }
1668    err = receive_client_request(csp);
1669    if (err != JB_ERR_OK)
1670    {
1671       return 1;
1672    }
1673    err = parse_client_request(csp);
1674    if (err != JB_ERR_OK)
1675    {
1676       return 1;
1677    }
1678
1679    return 0;
1680
1681 }
1682 #endif  /* def FUZZ */
1683
1684
1685 #ifdef FEATURE_FORCE_LOAD
1686 /*********************************************************************
1687  *
1688  * Function    :  force_required
1689  *
1690  * Description : Checks a request line to see if it contains
1691  *               the FORCE_PREFIX. If it does, it is removed
1692  *               unless enforcing requests has beend disabled.
1693  *
1694  * Parameters  :
1695  *          1  :  request_line = HTTP request line
1696  *
1697  * Returns     :  TRUE if force is required, FALSE otherwise.
1698  *
1699  *********************************************************************/
1700 static int force_required(const struct client_state *csp, char *request_line)
1701 {
1702    char *p;
1703
1704    p = strstr(request_line, "http://");
1705    if (p != NULL)
1706    {
1707       /* Skip protocol */
1708       p += strlen("http://");
1709    }
1710    else
1711    {
1712       /* Intercepted request usually don't specify the protocol. */
1713       p = request_line;
1714    }
1715
1716    /* Go to the beginning of the path */
1717    p = strstr(p, "/");
1718    if (p == NULL)
1719    {
1720       /*
1721        * If the path is missing the request line is invalid and we
1722        * are done here. The client-visible rejection happens later on.
1723        */
1724       return 0;
1725    }
1726
1727    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1728    {
1729       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1730       {
1731          /* XXX: Should clean more carefully */
1732          strclean(request_line, FORCE_PREFIX);
1733          log_error(LOG_LEVEL_FORCE,
1734             "Enforcing request: \"%s\".", request_line);
1735
1736          return 1;
1737       }
1738       log_error(LOG_LEVEL_FORCE,
1739          "Ignored force prefix in request: \"%s\".", request_line);
1740    }
1741
1742    return 0;
1743
1744 }
1745 #endif /* def FEATURE_FORCE_LOAD */
1746
1747
1748 /*********************************************************************
1749  *
1750  * Function    :  receive_client_request
1751  *
1752  * Description : Read the client's request (more precisely the
1753  *               client headers) and answer it if necessary.
1754  *
1755  * Parameters  :
1756  *          1  :  csp = Current client state (buffers, headers, etc...)
1757  *
1758  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1759  *
1760  *********************************************************************/
1761 static jb_err receive_client_request(struct client_state *csp)
1762 {
1763    char buf[BUFFER_SIZE];
1764    char *p;
1765    char *req = NULL;
1766    struct http_request *http;
1767    int len;
1768    jb_err err;
1769
1770    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1771    struct list header_list;
1772    struct list *headers = &header_list;
1773
1774    /* We don't care if the arriving data is a valid HTTP request or not. */
1775    csp->requests_received_total++;
1776
1777    http = csp->http;
1778
1779    memset(buf, 0, sizeof(buf));
1780
1781    req = get_request_line(csp);
1782    if (req == NULL)
1783    {
1784       mark_server_socket_tainted(csp);
1785       return JB_ERR_PARSE;
1786    }
1787    assert(*req != '\0');
1788
1789    if (client_protocol_is_unsupported(csp, req))
1790    {
1791       return JB_ERR_PARSE;
1792    }
1793
1794 #ifdef FEATURE_FORCE_LOAD
1795    if (force_required(csp, req))
1796    {
1797       csp->flags |= CSP_FLAG_FORCED;
1798    }
1799 #endif /* def FEATURE_FORCE_LOAD */
1800
1801    err = parse_http_request(req, http);
1802    freez(req);
1803    if (JB_ERR_OK != err)
1804    {
1805       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1806          get_write_delay(csp));
1807       /* XXX: Use correct size */
1808       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1809       log_error(LOG_LEVEL_ERROR,
1810          "Couldn't parse request line received from %s: %s",
1811          csp->ip_addr_str, jb_err_to_string(err));
1812
1813       free_http_request(http);
1814       return JB_ERR_PARSE;
1815    }
1816
1817    /* grab the rest of the client's headers */
1818    init_list(headers);
1819    for (;;)
1820    {
1821       p = get_header(csp->client_iob);
1822
1823       if (p == NULL)
1824       {
1825          /* There are no additional headers to read. */
1826          break;
1827       }
1828
1829       if (*p == '\0')
1830       {
1831          /*
1832           * We didn't receive a complete header
1833           * line yet, get the rest of it.
1834           */
1835          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1836          {
1837             log_error(LOG_LEVEL_ERROR,
1838                "Stopped grabbing the client headers.");
1839             destroy_list(headers);
1840             return JB_ERR_PARSE;
1841          }
1842
1843          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1844          if (len <= 0)
1845          {
1846             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1847             destroy_list(headers);
1848             return JB_ERR_PARSE;
1849          }
1850
1851          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1852          {
1853             /*
1854              * If there is no memory left for buffering the
1855              * request, there is nothing we can do but hang up
1856              */
1857             destroy_list(headers);
1858             return JB_ERR_MEMORY;
1859          }
1860       }
1861       else
1862       {
1863          if (!strncmpic(p, "Transfer-Encoding:", 18))
1864          {
1865             /*
1866              * XXX: should be called through sed()
1867              *      but currently can't.
1868              */
1869             client_transfer_encoding(csp, &p);
1870          }
1871          /*
1872           * We were able to read a complete
1873           * header and can finally enlist it.
1874           */
1875          enlist(headers, p);
1876          freez(p);
1877       }
1878    }
1879
1880    if (http->host == NULL)
1881    {
1882       /*
1883        * If we still don't know the request destination,
1884        * the request is invalid or the client uses
1885        * Privoxy without its knowledge.
1886        */
1887       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1888       {
1889          /*
1890           * Our attempts to get the request destination
1891           * elsewhere failed or Privoxy is configured
1892           * to only accept proxy requests.
1893           *
1894           * An error response has already been sent
1895           * and we're done here.
1896           */
1897          return JB_ERR_PARSE;
1898       }
1899    }
1900
1901 #ifdef FEATURE_CLIENT_TAGS
1902    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1903    set_client_address(csp, headers);
1904    get_tag_list_for_client(csp->client_tags, csp->client_address);
1905 #endif
1906
1907    /*
1908     * Determine the actions for this URL
1909     */
1910 #ifdef FEATURE_TOGGLE
1911    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1912    {
1913       /* Most compatible set of actions (i.e. none) */
1914       init_current_action(csp->action);
1915    }
1916    else
1917 #endif /* ndef FEATURE_TOGGLE */
1918    {
1919       get_url_actions(csp, http);
1920    }
1921
1922    enlist(csp->headers, http->cmd);
1923
1924    /* Append the previously read headers */
1925    err = list_append_list_unique(csp->headers, headers);
1926    destroy_list(headers);
1927
1928    return err;
1929
1930 }
1931
1932
1933 /*********************************************************************
1934  *
1935  * Function    : parse_client_request
1936  *
1937  * Description : Parses the client's request and decides what to do
1938  *               with it.
1939  *
1940  *               Note that since we're not using select() we could get
1941  *               blocked here if a client connected, then didn't say
1942  *               anything!
1943  *
1944  * Parameters  :
1945  *          1  :  csp = Current client state (buffers, headers, etc...)
1946  *
1947  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1948  *
1949  *********************************************************************/
1950 static jb_err parse_client_request(struct client_state *csp)
1951 {
1952    struct http_request *http = csp->http;
1953    jb_err err;
1954
1955 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1956    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1957     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1958     && (csp->http->ssl == 0))
1959    {
1960       /* Assume persistence until further notice */
1961       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1962    }
1963 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1964
1965    if (csp->http->ssl == 0)
1966    {
1967       /*
1968        * This whole block belongs to chat() but currently
1969        * has to be executed before sed().
1970        */
1971       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1972       {
1973          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
1974          {
1975             return JB_ERR_PARSE;
1976          }
1977       }
1978       else
1979       {
1980          csp->expected_client_content_length = get_expected_content_length(csp->headers);
1981       }
1982       verify_request_length(csp);
1983    }
1984 #ifndef FEATURE_HTTPS_INSPECTION
1985    else
1986    {
1987       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1988    }
1989 #endif
1990
1991    err = sed(csp, FILTER_CLIENT_HEADERS);
1992    if (JB_ERR_OK != err)
1993    {
1994       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
1995          csp->ip_addr_str);
1996       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
1997          csp->ip_addr_str, csp->http->cmd);
1998       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
1999       return JB_ERR_PARSE;
2000    }
2001    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2002
2003    /* Check request line for rewrites. */
2004    if ((NULL == csp->headers->first->str)
2005       || (strcmp(http->cmd, csp->headers->first->str) &&
2006          (JB_ERR_OK != change_request_destination(csp))))
2007    {
2008       /*
2009        * A header filter broke the request line - bail out.
2010        */
2011       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
2012          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2013       /* XXX: Use correct size */
2014       log_error(LOG_LEVEL_CLF,
2015          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2016       log_error(LOG_LEVEL_ERROR,
2017          "Invalid request line after applying header filters.");
2018       free_http_request(http);
2019
2020       return JB_ERR_PARSE;
2021    }
2022
2023    if (client_has_unsupported_expectations(csp))
2024    {
2025       return JB_ERR_PARSE;
2026    }
2027
2028    return JB_ERR_OK;
2029
2030 }
2031
2032
2033 /*********************************************************************
2034  *
2035  * Function    : read_http_request_body
2036  *
2037  * Description : Reads remaining request body from the client.
2038  *
2039  * Parameters  :
2040  *          1  :  csp = Current client state (buffers, headers, etc...)
2041  *
2042  * Returns     :  0 on success, anything else is an error.
2043  *
2044  *********************************************************************/
2045 static int read_http_request_body(struct client_state *csp)
2046 {
2047    size_t to_read = csp->expected_client_content_length;
2048    int len;
2049
2050    assert(to_read != 0);
2051
2052    /* check if all data has been already read */
2053    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2054    {
2055       return 0;
2056    }
2057
2058    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2059         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2060         to_read -= (unsigned)len)
2061    {
2062       char buf[BUFFER_SIZE];
2063       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2064
2065       log_error(LOG_LEVEL_CONNECT,
2066          "Waiting for up to %lu bytes of request body from the client.",
2067          max_bytes_to_read);
2068       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2069       if (len <= -1)
2070       {
2071          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2072          return 1;
2073       }
2074       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2075       {
2076          return 1;
2077       }
2078       assert(to_read >= len);
2079    }
2080
2081    if (to_read != 0)
2082    {
2083       log_error(LOG_LEVEL_CONNECT, "Not enough request body has been read: expected %llu more bytes",
2084          csp->expected_client_content_length);
2085       return 1;
2086    }
2087    log_error(LOG_LEVEL_CONNECT, "The last %llu bytes of the request body have been read",
2088       csp->expected_client_content_length);
2089    return 0;
2090 }
2091
2092
2093 /*********************************************************************
2094  *
2095  * Function    : update_client_headers
2096  *
2097  * Description : Updates the HTTP headers from the client request.
2098  *
2099  * Parameters  :
2100  *          1  :  csp = Current client state (buffers, headers, etc...)
2101  *          2  :  new_content_length = new content length value to set
2102  *
2103  * Returns     :  0 on success, anything else is an error.
2104  *
2105  *********************************************************************/
2106 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2107 {
2108    static const char content_length[] = "Content-Length:";
2109    int updated = 0;
2110    struct list_entry *p;
2111
2112 #ifndef FEATURE_HTTPS_INSPECTION
2113    for (p = csp->headers->first;
2114 #else
2115    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2116 #endif
2117         !updated  && (p != NULL); p = p->next)
2118    {
2119       /* Header crunch()ed in previous run? -> ignore */
2120       if (p->str == NULL)
2121       {
2122          continue;
2123       }
2124
2125       /* Does the current parser handle this header? */
2126       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2127       {
2128          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2129          if (!updated)
2130          {
2131             return 1;
2132          }
2133       }
2134    }
2135
2136    return !updated;
2137 }
2138
2139
2140 /*********************************************************************
2141  *
2142  * Function    : can_filter_request_body
2143  *
2144  * Description : Checks if the current request body can be stored in
2145  *               the client_iob without hitting buffer limit.
2146  *
2147  * Parameters  :
2148  *          1  : csp = Current client state (buffers, headers, etc...)
2149  *
2150  * Returns     : TRUE if the current request size do not exceed buffer limit
2151  *               FALSE otherwise.
2152  *
2153  *********************************************************************/
2154 static int can_filter_request_body(const struct client_state *csp)
2155 {
2156    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2157                        csp->expected_client_content_length))
2158    {
2159       log_error(LOG_LEVEL_INFO,
2160          "Not filtering request body from %s: buffer limit %lu will be exceeded "
2161          "(content length %lluu)", csp->ip_addr_str, csp->config->buffer_limit,
2162          csp->expected_client_content_length);
2163       return FALSE;
2164    }
2165    return TRUE;
2166 }
2167
2168
2169 /*********************************************************************
2170  *
2171  * Function    : send_http_request
2172  *
2173  * Description : Sends the HTTP headers from the client request
2174  *               and all the body data that has already been received.
2175  *
2176  * Parameters  :
2177  *          1  :  csp = Current client state (buffers, headers, etc...)
2178  *
2179  * Returns     :  0 on success, anything else is an error.
2180  *
2181  *********************************************************************/
2182 static int send_http_request(struct client_state *csp)
2183 {
2184    char *hdr;
2185    int write_failure;
2186    const char *to_send;
2187    size_t to_send_len;
2188    int filter_client_body = csp->expected_client_content_length != 0 &&
2189       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2190
2191    if (filter_client_body)
2192    {
2193       if (read_http_request_body(csp))
2194       {
2195          return 1;
2196       }
2197       to_send_len = csp->expected_client_content_length;
2198       to_send = execute_client_body_filters(csp, &to_send_len);
2199       if (to_send == NULL)
2200       {
2201          /* just flush client_iob */
2202          filter_client_body = FALSE;
2203       }
2204       else if (to_send_len != csp->expected_client_content_length &&
2205          update_client_headers(csp, to_send_len))
2206       {
2207          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2208          return 1;
2209       }
2210       csp->expected_client_content_length = 0;
2211    }
2212
2213    hdr = list_to_text(csp->headers);
2214    if (hdr == NULL)
2215    {
2216       /* FIXME Should handle error properly */
2217       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2218    }
2219    list_remove_all(csp->headers);
2220
2221    /*
2222     * Write the client's (modified) header to the server
2223     * (along with anything else that may be in the buffer)
2224     */
2225    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2226    freez(hdr);
2227
2228    if (write_failure)
2229    {
2230       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2231          csp->http->hostport);
2232       return 1;
2233    }
2234
2235    if (filter_client_body)
2236    {
2237       write_failure = 0 != write_socket(csp->server_connection.sfd, to_send, to_send_len);
2238       freez(to_send);
2239       if (write_failure)
2240       {
2241          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s: %E",
2242             csp->http->hostport);
2243          return 1;
2244       }
2245    }
2246
2247    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2248       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2249    {
2250       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2251          csp->http->hostport);
2252       return 1;
2253    }
2254    return 0;
2255 }
2256
2257
2258 #ifdef FEATURE_HTTPS_INSPECTION
2259 /*********************************************************************
2260  *
2261  * Function    : read_https_request_body
2262  *
2263  * Description : Reads remaining request body from the client.
2264  *
2265  * Parameters  :
2266  *          1  :  csp = Current client state (buffers, headers, etc...)
2267  *
2268  * Returns     :  0 on success, anything else is an error.
2269  *
2270  *********************************************************************/
2271 static int read_https_request_body(struct client_state *csp)
2272 {
2273    size_t to_read = csp->expected_client_content_length;
2274    int len;
2275
2276    assert(to_read != 0);
2277
2278    /* check if all data has been already read */
2279    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2280    {
2281       return 0;
2282    }
2283
2284    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2285         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2286           data_is_available(csp->cfd, csp->config->socket_timeout));
2287         to_read -= (unsigned)len)
2288    {
2289       unsigned char buf[BUFFER_SIZE];
2290       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2291
2292       log_error(LOG_LEVEL_CONNECT,
2293          "Waiting for up to %lu bytes of request body from the client.",
2294          max_bytes_to_read);
2295       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2296          (unsigned)max_bytes_to_read);
2297       if (len <= 0)
2298       {
2299          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s", csp->ip_addr_str);
2300          return 1;
2301       }
2302       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2303       {
2304          return 1;
2305       }
2306       assert(to_read >= len);
2307    }
2308
2309    if (to_read != 0)
2310    {
2311       log_error(LOG_LEVEL_CONNECT,
2312          "Not enough request body has been read: expected %lu more bytes",
2313          to_read);
2314       return 1;
2315    }
2316
2317    log_error(LOG_LEVEL_CONNECT,
2318       "The last %llu bytes of the request body have been read",
2319       csp->expected_client_content_length);
2320    return 0;
2321 }
2322
2323
2324 /*********************************************************************
2325  *
2326  * Function    : receive_and_send_encrypted_post_data
2327  *
2328  * Description : Reads remaining request body from the client and sends
2329  *               it to the server.
2330  *
2331  * Parameters  :
2332  *          1  :  csp = Current client state (buffers, headers, etc...)
2333  *
2334  * Returns     :  0 on success, anything else is an error.
2335  *
2336  *********************************************************************/
2337 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2338 {
2339    int content_length_known = csp->expected_client_content_length != 0;
2340
2341    while (is_ssl_pending(&(csp->ssl_client_attr))
2342       || (content_length_known && csp->expected_client_content_length != 0))
2343    {
2344       unsigned char buf[BUFFER_SIZE];
2345       int len;
2346       int max_bytes_to_read = sizeof(buf);
2347
2348       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2349       {
2350          max_bytes_to_read = (int)csp->expected_client_content_length;
2351       }
2352       log_error(LOG_LEVEL_CONNECT,
2353          "Waiting for up to %d bytes of request body from the client.",
2354          max_bytes_to_read);
2355       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2356          (unsigned)max_bytes_to_read);
2357       if (len == -1)
2358       {
2359          return 1;
2360       }
2361       if (len == 0)
2362       {
2363          /* XXX: Does this actually happen? */
2364          break;
2365       }
2366       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body",
2367          len);
2368       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2369       if (len == -1)
2370       {
2371          return 1;
2372       }
2373       if (csp->expected_client_content_length != 0)
2374       {
2375          if (csp->expected_client_content_length >= len)
2376          {
2377             csp->expected_client_content_length -= (unsigned)len;
2378          }
2379          if (csp->expected_client_content_length == 0)
2380          {
2381             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2382             break;
2383          }
2384       }
2385    }
2386
2387    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body");
2388
2389    return 0;
2390
2391 }
2392
2393
2394 /*********************************************************************
2395  *
2396  * Function    : send_https_request
2397  *
2398  * Description : Sends the HTTP headers from the client request
2399  *               and all the body data that has already been received.
2400  *
2401  * Parameters  :
2402  *          1  :  csp = Current client state (buffers, headers, etc...)
2403  *
2404  * Returns     :  0 on success, anything else is an error.
2405  *
2406  *********************************************************************/
2407 static int send_https_request(struct client_state *csp)
2408 {
2409    char *hdr;
2410    int ret;
2411    long flushed = 0;
2412    const char *to_send;
2413    size_t to_send_len;
2414    int filter_client_body = csp->expected_client_content_length != 0 &&
2415       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2416
2417    if (filter_client_body)
2418    {
2419       if (read_https_request_body(csp))
2420       {
2421          return 1;
2422       }
2423       to_send_len = csp->expected_client_content_length;
2424       to_send = execute_client_body_filters(csp, &to_send_len);
2425       if (to_send == NULL)
2426       {
2427          /* just flush client_iob */
2428          filter_client_body = FALSE;
2429       }
2430       else if (to_send_len != csp->expected_client_content_length &&
2431          update_client_headers(csp, to_send_len))
2432       {
2433          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2434          return 1;
2435       }
2436       csp->expected_client_content_length = 0;
2437    }
2438
2439    hdr = list_to_text(csp->https_headers);
2440    if (hdr == NULL)
2441    {
2442       /* FIXME Should handle error properly */
2443       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2444    }
2445    list_remove_all(csp->https_headers);
2446
2447    /*
2448     * Write the client's (modified) header to the server
2449     * (along with anything else that may be in the buffer)
2450     */
2451    ret = ssl_send_data(&(csp->ssl_server_attr),
2452       (const unsigned char *)hdr, strlen(hdr));
2453    freez(hdr);
2454
2455    if (ret < 0)
2456    {
2457       log_error(LOG_LEVEL_CONNECT,
2458          "Failed sending encrypted request headers to: %s: %E",
2459          csp->http->hostport);
2460       mark_server_socket_tainted(csp);
2461       return 1;
2462    }
2463
2464    if (filter_client_body)
2465    {
2466       ret = ssl_send_data(&(csp->ssl_server_attr), (const unsigned char *)to_send, to_send_len);
2467       freez(to_send);
2468       if (ret < 0)
2469       {
2470          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s",
2471             csp->http->hostport);
2472          return 1;
2473       }
2474    }
2475
2476    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2477       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2478             csp->client_iob)) < 0))
2479    {
2480       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2481          csp->http->hostport);
2482       return 1;
2483    }
2484    if (flushed != 0 || csp->expected_client_content_length != 0)
2485    {
2486       if (csp->expected_client_content_length != 0)
2487       {
2488          if (csp->expected_client_content_length < flushed)
2489          {
2490             log_error(LOG_LEVEL_ERROR,
2491                "Flushed %ld bytes of request body while only expecting %llu",
2492                flushed, csp->expected_client_content_length);
2493             csp->expected_client_content_length = 0;
2494          }
2495          else
2496          {
2497             log_error(LOG_LEVEL_CONNECT,
2498                "Flushed %ld bytes of request body while expecting %llu",
2499                flushed, csp->expected_client_content_length);
2500             csp->expected_client_content_length -= (unsigned)flushed;
2501             if (receive_and_send_encrypted_post_data(csp))
2502             {
2503                return 1;
2504             }
2505          }
2506       }
2507       else
2508       {
2509          log_error(LOG_LEVEL_CONNECT,
2510             "Flushed %ld bytes of request body", flushed);
2511       }
2512    }
2513
2514    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2515
2516    return 0;
2517
2518 }
2519
2520
2521 /*********************************************************************
2522  *
2523  * Function    :  receive_encrypted_request_headers
2524  *
2525  * Description :  Receives the encrypted request headers when
2526  *                https-inspecting.
2527  *
2528  * Parameters  :
2529  *          1  :  csp = Current client state (buffers, headers, etc...)
2530  *
2531  * Returns     :  JB_ERR_OK on success,
2532  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2533  *
2534  *********************************************************************/
2535 static jb_err receive_encrypted_request_headers(struct client_state *csp)
2536 {
2537    char buf[BUFFER_SIZE];
2538    int len;
2539    char *p;
2540
2541    do
2542    {
2543       log_error(LOG_LEVEL_HEADER, "Waiting for encrypted client headers");
2544       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2545           !data_is_available(csp->cfd, csp->config->socket_timeout))
2546       {
2547          log_error(LOG_LEVEL_CONNECT,
2548             "Socket %d timed out while waiting for client headers", csp->cfd);
2549          return JB_ERR_PARSE;
2550       }
2551       len = ssl_recv_data(&(csp->ssl_client_attr),
2552          (unsigned char *)buf, sizeof(buf));
2553       if (len == 0)
2554       {
2555          log_error(LOG_LEVEL_CONNECT,
2556             "Socket %d closed while waiting for client headers", csp->cfd);
2557          return JB_ERR_PARSE;
2558       }
2559       if (len == -1)
2560       {
2561          return JB_ERR_PARSE;
2562       }
2563       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2564       {
2565          return JB_ERR_MEMORY;
2566       }
2567       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2568    } while (p == NULL);
2569
2570    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2571
2572    return JB_ERR_OK;
2573 }
2574
2575
2576 /*********************************************************************
2577  *
2578  * Function    :  change_encrypted_request_destination
2579  *
2580  * Description :  Parse a (rewritten) request line from an encrypted
2581  *                request and regenerate the http request data.
2582  *
2583  * Parameters  :
2584  *          1  :  csp = Current client state (buffers, headers, etc...)
2585  *
2586  * Returns     :  Forwards the parse_http_request() return code.
2587  *                Terminates in case of memory problems.
2588  *
2589  *********************************************************************/
2590 static jb_err change_encrypted_request_destination(struct client_state *csp)
2591 {
2592    jb_err err;
2593    char *original_host = csp->http->host;
2594    int original_port = csp->http->port;
2595
2596    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2597       csp->https_headers->first->str);
2598    csp->http->host = NULL;
2599    free_http_request(csp->http);
2600    err = parse_http_request(csp->https_headers->first->str, csp->http);
2601    if (JB_ERR_OK != err)
2602    {
2603       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2604          jb_err_to_string(err));
2605       freez(original_host);
2606       return err;
2607    }
2608
2609    if (csp->http->host == NULL)
2610    {
2611       char port_string[10];
2612       /*
2613        * The rewritten request line did not specify a host
2614        * which means we can use the original host specified
2615        * by the client.
2616        */
2617       csp->http->host = original_host;
2618       csp->http->port = original_port;
2619       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2620          csp->http->host);
2621       /*
2622        * If the rewritten request line didn't contain a host
2623        * it also didn't contain a port so we can reuse the host
2624        * port.
2625        */
2626       freez(csp->http->hostport);
2627       csp->http->hostport = strdup_or_die(csp->http->host);
2628       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2629       err = string_append(&csp->http->hostport, port_string);
2630       if (err != JB_ERR_OK)
2631       {
2632          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2633             jb_err_to_string(err));
2634          return err;
2635       }
2636
2637       /*
2638        * While the request line didn't mention it,
2639        * we're https-inspecting and want to speak TLS
2640        * with the server.
2641        */
2642       csp->http->server_ssl = 1;
2643       csp->http->ssl = 1;
2644    }
2645    else
2646    {
2647       /* The rewrite filter added a host so we can ditch the original */
2648       freez(original_host);
2649       csp->http->server_ssl = csp->http->ssl;
2650    }
2651
2652    csp->http->client_ssl = 1;
2653
2654    freez(csp->https_headers->first->str);
2655    build_request_line(csp, NULL, &csp->https_headers->first->str);
2656
2657    if (!server_use_ssl(csp))
2658    {
2659       log_error(LOG_LEVEL_REDIRECTS,
2660          "Rewritten request line results in downgrade to http");
2661       /*
2662        * Replace the unencryptd headers received with the
2663        * CONNECT request with the ones we received securely.
2664        */
2665       destroy_list(csp->headers);
2666       csp->headers->first = csp->https_headers->first;
2667       csp->headers->last  = csp->https_headers->last;
2668       csp->https_headers->first = NULL;
2669       csp->https_headers->last = NULL;
2670    }
2671
2672    return JB_ERR_OK;
2673
2674 }
2675
2676
2677 /*********************************************************************
2678  *
2679  * Function    :  process_encrypted_request_headers
2680  *
2681  * Description :  Receives and parses the encrypted headers send
2682  *                by the client when https-inspecting.
2683  *
2684  * Parameters  :
2685  *          1  :  csp = Current client state (buffers, headers, etc...)
2686  *
2687  * Returns     :  JB_ERR_OK on success,
2688  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2689  *
2690  *********************************************************************/
2691 static jb_err process_encrypted_request_headers(struct client_state *csp)
2692 {
2693    char *p;
2694    char *request_line;
2695    jb_err err;
2696    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2697    struct list header_list;
2698    struct list *headers = &header_list;
2699
2700    assert(csp->ssl_with_client_is_opened);
2701
2702 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2703    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2704    {
2705       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2706    }
2707 #endif
2708    err = receive_encrypted_request_headers(csp);
2709    if (err != JB_ERR_OK)
2710    {
2711       if (csp->client_iob->cur == NULL ||
2712           csp->client_iob->cur == csp->client_iob->eod)
2713       {
2714          /*
2715           * We did not receive any data, most likely because the
2716           * client is done. Don't log this as a parse failure.
2717           */
2718          return JB_ERR_PARSE;
2719       }
2720       /* XXX: Also used for JB_ERR_MEMORY */
2721       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2722          jb_err_to_string(err));
2723       ssl_send_data_delayed(&(csp->ssl_client_attr),
2724          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2725       return err;
2726    }
2727
2728    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2729    request_line = get_header(csp->client_iob);
2730    if (request_line == NULL)
2731    {
2732       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2733       ssl_send_data_delayed(&(csp->ssl_client_attr),
2734          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2735       return JB_ERR_PARSE;
2736    }
2737    assert(*request_line != '\0');
2738
2739    if (client_protocol_is_unsupported(csp, request_line))
2740    {
2741       /*
2742        * If the protocol is unsupported we're done here.
2743        * client_protocol_is_unsupported() took care of sending
2744        * the error response and logging the error message.
2745        */
2746       return JB_ERR_PARSE;
2747    }
2748
2749 #ifdef FEATURE_FORCE_LOAD
2750    if (force_required(csp, request_line))
2751    {
2752       csp->flags |= CSP_FLAG_FORCED;
2753    }
2754 #endif /* def FEATURE_FORCE_LOAD */
2755
2756    free_http_request(csp->http);
2757
2758    err = parse_http_request(request_line, csp->http);
2759    /* XXX: Restore ssl setting. This is ugly */
2760    csp->http->client_ssl = 1;
2761    csp->http->server_ssl = 1;
2762
2763    freez(request_line);
2764    if (JB_ERR_OK != err)
2765    {
2766       ssl_send_data_delayed(&(csp->ssl_client_attr),
2767          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2768       /* XXX: Use correct size */
2769       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2770       log_error(LOG_LEVEL_ERROR,
2771          "Couldn't parse request line received from %s: %s",
2772          csp->ip_addr_str, jb_err_to_string(err));
2773
2774       free_http_request(csp->http);
2775       return JB_ERR_PARSE;
2776    }
2777
2778    /* Parse the rest of the client's headers. */
2779    init_list(headers);
2780    for (;;)
2781    {
2782       p = get_header(csp->client_iob);
2783
2784       if (p == NULL)
2785       {
2786          /* There are no additional headers to read. */
2787          break;
2788       }
2789       enlist(headers, p);
2790       freez(p);
2791    }
2792
2793    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2794    {
2795       /*
2796        * Our attempts to get the request destination
2797        * elsewhere failed.
2798        */
2799       log_error(LOG_LEVEL_ERROR,
2800          "Failed to get the encrypted request destination");
2801       ssl_send_data_delayed(&(csp->ssl_client_attr),
2802          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2803       return JB_ERR_PARSE;
2804    }
2805
2806    /* Split the domain we just got for pattern matching */
2807    init_domain_components(csp->http);
2808
2809 #ifdef FEATURE_CLIENT_TAGS
2810    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2811    if (csp->client_address == NULL)
2812    {
2813       set_client_address(csp, headers);
2814       get_tag_list_for_client(csp->client_tags, csp->client_address);
2815    }
2816 #endif
2817
2818 #ifdef FEATURE_TOGGLE
2819    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2820 #endif
2821    {
2822       /*
2823        * Determine the actions for this request after
2824        * clearing the ones from the previous one.
2825        */
2826       free_current_action(csp->action);
2827       get_url_actions(csp, csp->http);
2828    }
2829
2830    enlist(csp->https_headers, csp->http->cmd);
2831
2832    /* Append the previously read headers */
2833    err = list_append_list_unique(csp->https_headers, headers);
2834    destroy_list(headers);
2835    if (JB_ERR_OK != err)
2836    {
2837       /* XXX: Send error message */
2838       return err;
2839    }
2840
2841    /* XXX: Work around crash */
2842    csp->error_message = NULL;
2843
2844    /* XXX: Why do this here? */
2845    csp->http->ssl = 1;
2846
2847    err = sed_https(csp);
2848    if (JB_ERR_OK != err)
2849    {
2850       ssl_send_data_delayed(&(csp->ssl_client_attr),
2851          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2852       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2853          csp->ip_addr_str);
2854       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2855          csp->ip_addr_str, csp->http->cmd);
2856       return JB_ERR_PARSE;
2857    }
2858
2859    if ((NULL == csp->https_headers->first->str)
2860       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2861          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2862    {
2863       ssl_send_data_delayed(&(csp->ssl_client_attr),
2864          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2865          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2866       log_error(LOG_LEVEL_ERROR,
2867          "Invalid request line after applying header filters.");
2868       /* XXX: Use correct size */
2869       log_error(LOG_LEVEL_CLF,
2870          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2871
2872       return JB_ERR_PARSE;
2873    }
2874
2875    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2876    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2877       csp->http->path);
2878
2879    return err;
2880
2881 }
2882
2883 /*********************************************************************
2884  *
2885  * Function    :  cgi_page_requested
2886  *
2887  * Description :  Checks if a request is for an internal CGI page.
2888  *
2889  * Parameters  :
2890  *          1  :  host = The host requested by the client.
2891  *
2892  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2893  *
2894  *********************************************************************/
2895 static int cgi_page_requested(const char *host)
2896 {
2897    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2898     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2899     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2900     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2901    {
2902       return 1;
2903    }
2904
2905    return 0;
2906
2907 }
2908
2909
2910 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2911 /*********************************************************************
2912  *
2913  * Function    :  continue_https_chat
2914  *
2915  * Description :  Behaves similar to chat() but only deals with
2916  *                https-inspected requests that arrive on an already
2917  *                established connection. The first request is always
2918  *                served by chat() which is a lot more complex as it
2919  *                has to deal with forwarding settings and connection
2920  *                failures etc.
2921  *
2922  *                If a connection to the server has already been
2923  *                opened it is reused unless the request is blocked
2924  *                or the forwarder changed.
2925  *
2926  *                If a connection to the server has not yet been
2927  *                opened (because the previous request was crunched),
2928  *                or the forwarder changed, the connection is dropped
2929  *                so that the client retries on a fresh one.
2930  *
2931  * Parameters  :
2932  *          1  :  csp = Current client state (buffers, headers, etc...)
2933  *
2934  * Returns     :  Nothing.
2935  *
2936  *********************************************************************/
2937 static void continue_https_chat(struct client_state *csp)
2938 {
2939    const struct forward_spec *fwd;
2940
2941    if (JB_ERR_OK != process_encrypted_request_headers(csp))
2942    {
2943       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2944       return;
2945    }
2946
2947    csp->requests_received_total++;
2948
2949    /*
2950     * We have an encrypted request. Check if one of the crunchers wants it.
2951     */
2952    if (crunch_response_triggered(csp, crunchers_all))
2953    {
2954       /*
2955        * Yes. The client got the crunch response and we're done here.
2956        */
2957       return;
2958    }
2959    if (csp->ssl_with_server_is_opened == 0)
2960    {
2961       log_error(LOG_LEVEL_CONNECT,
2962          "Dropping the client connection on socket %d. "
2963          "The server connection has not been established yet.",
2964          csp->cfd);
2965       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2966       return;
2967    }
2968    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2969
2970    fwd = forward_url(csp, csp->http);
2971    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2972    {
2973       log_error(LOG_LEVEL_CONNECT,
2974          "Dropping the client connection on socket %d with "
2975          "server socket %d connected to %s. The forwarder has changed.",
2976          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2977       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2978       return;
2979    }
2980
2981    log_applied_actions(csp->action);
2982
2983    log_error(LOG_LEVEL_CONNECT,
2984       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2985       csp->server_connection.sfd, csp->server_connection.host,
2986       csp->server_connection.requests_sent_total);
2987
2988    if (send_https_request(csp))
2989    {
2990       /*
2991        * Most likely the server connection timed out. We can't easily
2992        * create a new one so simply drop the client connection without a
2993        * error response to let the client retry.
2994        */
2995       log_error(LOG_LEVEL_CONNECT,
2996          "Dropping client connection on socket %d. "
2997          "Forwarding the encrypted client request failed.",
2998          csp->cfd);
2999       return;
3000    }
3001    csp->server_connection.request_sent = time(NULL);
3002    csp->server_connection.requests_sent_total++;
3003    handle_established_connection(csp);
3004    freez(csp->receive_buffer);
3005 }
3006 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3007 #endif
3008
3009
3010 /*********************************************************************
3011  *
3012  * Function    :  handle_established_connection
3013  *
3014  * Description :  Shuffle data between client and server once the
3015  *                connection has been established and the request
3016  *                has been sent.
3017  *
3018  * Parameters  :
3019  *          1  :  csp = Current client state (buffers, headers, etc...)
3020  *
3021  * Returns     :  Nothing.
3022  *
3023  *********************************************************************/
3024 static void handle_established_connection(struct client_state *csp)
3025 {
3026    char *hdr;
3027    char *p;
3028    int n;
3029 #ifdef HAVE_POLL
3030    struct pollfd poll_fds[2];
3031 #else
3032    fd_set rfds;
3033    jb_socket maxfd;
3034    struct timeval timeout;
3035 #endif
3036    int server_body;
3037    int ms_iis5_hack = 0;
3038    unsigned long long byte_count = 0;
3039    struct http_request *http;
3040    long len = 0; /* for buffer sizes (and negative error codes) */
3041    int buffer_and_filter_content = 0;
3042    unsigned int write_delay;
3043 #ifdef FEATURE_HTTPS_INSPECTION
3044    int ret = 0;
3045    int use_ssl_tunnel = 0;
3046    csp->dont_verify_certificate = 0;
3047
3048    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3049    {
3050       /* Pass encrypted content without filtering. */
3051       use_ssl_tunnel = 1;
3052    }
3053 #endif
3054
3055    /* Skeleton for HTTP response, if we should intercept the request */
3056    struct http_response *rsp;
3057 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3058    int watch_client_socket;
3059 #endif
3060
3061    csp->receive_buffer_size = csp->config->receive_buffer_size;
3062    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3063    if (csp->receive_buffer == NULL)
3064    {
3065       log_error(LOG_LEVEL_ERROR,
3066          "Out of memory. Failed to allocate the receive buffer.");
3067       rsp = cgi_error_memory();
3068       send_crunch_response(csp, rsp);
3069       return;
3070    }
3071
3072    http = csp->http;
3073
3074 #ifndef HAVE_POLL
3075    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3076       csp->cfd : csp->server_connection.sfd;
3077 #endif
3078
3079    /* pass data between the client and server
3080     * until one or the other shuts down the connection.
3081     */
3082
3083    server_body = 0;
3084
3085 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3086    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3087 #endif
3088    write_delay = get_write_delay(csp);
3089
3090    for (;;)
3091    {
3092 #ifdef FEATURE_HTTPS_INSPECTION
3093       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3094       {
3095          /*
3096           * It's possible that the TLS library already consumed all the
3097           * data the server intends to send. If that happens poll() and
3098           * select() will no longer see the data as available so we have
3099           * to skip the calls.
3100           */
3101          goto server_wants_to_talk;
3102       }
3103 #endif
3104 #ifndef HAVE_POLL
3105       FD_ZERO(&rfds);
3106 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3107       if (!watch_client_socket)
3108       {
3109          maxfd = csp->server_connection.sfd;
3110       }
3111       else
3112 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3113       {
3114          FD_SET(csp->cfd, &rfds);
3115       }
3116
3117       FD_SET(csp->server_connection.sfd, &rfds);
3118 #endif /* ndef HAVE_POLL */
3119
3120 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3121       if ((csp->flags & CSP_FLAG_CHUNKED)
3122          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3123          && ((csp->iob->eod - csp->iob->cur) >= 5)
3124          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3125       {
3126          /*
3127           * XXX: This check should be obsolete now,
3128           *      but let's wait a while to be sure.
3129           */
3130          log_error(LOG_LEVEL_CONNECT,
3131             "Looks like we got the last chunk together with "
3132             "the server headers but didn't detect it earlier. "
3133             "We better stop reading.");
3134          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3135          csp->expected_content_length = byte_count;
3136          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3137       }
3138       if (server_body && server_response_is_complete(csp, byte_count))
3139       {
3140          if (csp->expected_content_length == byte_count)
3141          {
3142             log_error(LOG_LEVEL_CONNECT,
3143                "Done reading from server. Content length: %llu as expected. "
3144                "Bytes most recently read: %ld.",
3145                byte_count, len);
3146          }
3147          else
3148          {
3149             log_error(LOG_LEVEL_CONNECT,
3150                "Done reading from server. Expected content length: %llu. "
3151                "Actual content length: %llu. Bytes most recently read: %ld.",
3152                csp->expected_content_length, byte_count, len);
3153          }
3154          len = 0;
3155          /*
3156           * XXX: Should not jump around, handle_established_connection()
3157           * is complicated enough already.
3158           */
3159          goto reading_done;
3160       }
3161 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3162
3163 #ifdef HAVE_POLL
3164       poll_fds[0].fd = csp->cfd;
3165 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3166       if (!watch_client_socket)
3167       {
3168          /*
3169           * Ignore incoming data, but still watch out
3170           * for disconnects etc. These flags are always
3171           * implied anyway but explicitly setting them
3172           * doesn't hurt.
3173           */
3174          poll_fds[0].events = POLLERR|POLLHUP;
3175       }
3176       else
3177 #endif
3178       {
3179          poll_fds[0].events = POLLIN;
3180       }
3181       poll_fds[1].fd = csp->server_connection.sfd;
3182       poll_fds[1].events = POLLIN;
3183       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3184 #else
3185       timeout.tv_sec = csp->config->socket_timeout;
3186       timeout.tv_usec = 0;
3187       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3188 #endif /* def HAVE_POLL */
3189
3190       /* Server or client not responding in timeout */
3191       if (n == 0)
3192       {
3193          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3194             csp->config->socket_timeout, http->url);
3195          if ((byte_count == 0) && (http->ssl == 0))
3196          {
3197             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3198          }
3199          mark_server_socket_tainted(csp);
3200 #ifdef FEATURE_HTTPS_INSPECTION
3201          close_client_and_server_ssl_connections(csp);
3202 #endif
3203          return;
3204       }
3205       else if (n < 0)
3206       {
3207 #ifdef HAVE_POLL
3208          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3209 #else
3210          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3211 #endif
3212          mark_server_socket_tainted(csp);
3213 #ifdef FEATURE_HTTPS_INSPECTION
3214          close_client_and_server_ssl_connections(csp);
3215 #endif
3216          return;
3217       }
3218
3219       /*
3220        * This is the body of the browser's request,
3221        * just read and write it.
3222        *
3223        * Receives data from browser and sends it to server
3224        *
3225        * XXX: Make sure the client doesn't use pipelining
3226        * behind Privoxy's back.
3227        */
3228 #ifdef HAVE_POLL
3229       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3230       {
3231          log_error(LOG_LEVEL_CONNECT,
3232             "The client socket %d has become unusable while "
3233             "the server socket %d is still open.",
3234             csp->cfd, csp->server_connection.sfd);
3235          mark_server_socket_tainted(csp);
3236          break;
3237       }
3238
3239       if (poll_fds[0].revents != 0)
3240 #else
3241       if (FD_ISSET(csp->cfd, &rfds))
3242 #endif /* def HAVE_POLL*/
3243       {
3244          int max_bytes_to_read = (int)csp->receive_buffer_size;
3245
3246 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3247          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3248          {
3249             if (data_is_available(csp->cfd, 0))
3250             {
3251                /*
3252                 * If the next request is already waiting, we have
3253                 * to stop select()ing the client socket. Otherwise
3254                 * we would always return right away and get nothing
3255                 * else done.
3256                 */
3257                watch_client_socket = 0;
3258                log_error(LOG_LEVEL_CONNECT,
3259                   "Stop watching client socket %d. "
3260                   "There's already another request waiting.",
3261                   csp->cfd);
3262                continue;
3263             }
3264             /*
3265              * If the client socket is set, but there's no data
3266              * available on the socket, the client went fishing
3267              * and continuing talking to the server makes no sense.
3268              */
3269             log_error(LOG_LEVEL_CONNECT,
3270                "The client closed socket %d while "
3271                "the server socket %d is still open.",
3272                csp->cfd, csp->server_connection.sfd);
3273             mark_server_socket_tainted(csp);
3274             break;
3275          }
3276          if (csp->expected_client_content_length != 0)
3277          {
3278             if (csp->expected_client_content_length < csp->receive_buffer_size)
3279             {
3280                max_bytes_to_read = (int)csp->expected_client_content_length;
3281             }
3282             log_error(LOG_LEVEL_CONNECT,
3283                "Waiting for up to %d bytes from the client.",
3284                max_bytes_to_read);
3285          }
3286          assert(max_bytes_to_read <= csp->receive_buffer_size);
3287 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3288
3289 #ifdef FEATURE_HTTPS_INSPECTION
3290          if (client_use_ssl(csp))
3291          {
3292             if (csp->http->status == 101)
3293             {
3294                len = ssl_recv_data(&(csp->ssl_client_attr),
3295                   (unsigned char *)csp->receive_buffer,
3296                   (size_t)max_bytes_to_read);
3297                if (len == -1)
3298                {
3299                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3300                      "on client socket %d for an upgraded connection",
3301                      csp->cfd);
3302                   break;
3303                }
3304                if (len == 0)
3305                {
3306                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3307                      "on client socket %d for an upgraded connection",
3308                      csp->cfd);
3309                   break;
3310                }
3311                byte_count += (unsigned long long)len;
3312                len = ssl_send_data(&(csp->ssl_server_attr),
3313                   (unsigned char *)csp->receive_buffer, (size_t)len);
3314                if (len == -1)
3315                {
3316                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3317                      "on server socket %d for an upgraded connection",
3318                      csp->server_connection.sfd);
3319                   break;
3320                }
3321                continue;
3322             }
3323             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3324             break;
3325          }
3326          else
3327 #endif /* def FEATURE_HTTPS_INSPECTION */
3328          {
3329             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3330
3331             if (len <= 0)
3332             {
3333                /* XXX: not sure if this is necessary. */
3334                mark_server_socket_tainted(csp);
3335                break; /* "game over, man" */
3336             }
3337
3338 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3339             if (csp->expected_client_content_length != 0)
3340             {
3341                assert(len <= max_bytes_to_read);
3342                csp->expected_client_content_length -= (unsigned)len;
3343                log_error(LOG_LEVEL_CONNECT,
3344                   "Expected client content length set to %llu "
3345                   "after reading %ld bytes.",
3346                   csp->expected_client_content_length, len);
3347                if (csp->expected_client_content_length == 0)
3348                {
3349                   log_error(LOG_LEVEL_CONNECT,
3350                      "Done reading from the client.");
3351                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3352                }
3353             }
3354 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3355
3356             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3357             {
3358                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3359                mark_server_socket_tainted(csp);
3360                return;
3361             }
3362          }
3363          continue;
3364       }
3365
3366       /*
3367        * The server wants to talk. It could be the header or the body.
3368        * If `hdr' is null, then it's the header otherwise it's the body.
3369        * FIXME: Does `hdr' really mean `host'? No.
3370        */
3371 #ifdef HAVE_POLL
3372       if (poll_fds[1].revents != 0)
3373 #else
3374       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3375 #endif /* HAVE_POLL */
3376       {
3377 #ifdef FEATURE_HTTPS_INSPECTION
3378          server_wants_to_talk:
3379 #endif
3380 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3381          /*
3382           * If we are buffering content, we don't want to eat up to
3383           * buffer-limit bytes if the client no longer cares about them.
3384           * If we aren't buffering, however, a dead client socket will be
3385           * noticed pretty much right away anyway, so we can reduce the
3386           * overhead by skipping the check.
3387           */
3388          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3389          {
3390 #ifdef _WIN32
3391             log_error(LOG_LEVEL_CONNECT,
3392                "The server still wants to talk, but the client may already have hung up on us.");
3393 #else
3394             log_error(LOG_LEVEL_CONNECT,
3395                "The server still wants to talk, but the client hung up on us.");
3396             mark_server_socket_tainted(csp);
3397 #ifdef FEATURE_HTTPS_INSPECTION
3398             close_client_and_server_ssl_connections(csp);
3399 #endif
3400             return;
3401 #endif /* def _WIN32 */
3402          }
3403 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3404
3405 #ifdef FEATURE_HTTPS_INSPECTION
3406          /*
3407           * Reading data from standard or secured connection (HTTP/HTTPS)
3408           */
3409          if (server_use_ssl(csp))
3410          {
3411             len = ssl_recv_data(&(csp->ssl_server_attr),
3412                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3413          }
3414          else
3415 #endif
3416          {
3417             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3418                (int)csp->receive_buffer_size);
3419          }
3420
3421          if (len < 0)
3422          {
3423             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3424
3425             if ((http->ssl && (csp->fwd == NULL))
3426 #ifdef FEATURE_HTTPS_INSPECTION
3427                && use_ssl_tunnel
3428 #endif
3429                 )
3430             {
3431                /*
3432                 * Just hang up. We already confirmed the client's CONNECT
3433                 * request with status code 200 and unencrypted content is
3434                 * no longer welcome.
3435                 */
3436                log_error(LOG_LEVEL_ERROR,
3437                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3438                return;
3439             }
3440             else if (byte_count)
3441             {
3442                /*
3443                 * Just hang up. We already transmitted the original headers
3444                 * and parts of the original content and therefore missed the
3445                 * chance to send an error message (without risking data corruption).
3446                 *
3447                 * XXX: we could retry with a fancy range request here.
3448                 */
3449                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3450                   "Unable to tell the client about the problem.");
3451                mark_server_socket_tainted(csp);
3452 #ifdef FEATURE_HTTPS_INSPECTION
3453                close_client_and_server_ssl_connections(csp);
3454 #endif
3455                return;
3456             }
3457             /*
3458              * XXX: Consider handling the cases above the same.
3459              */
3460             mark_server_socket_tainted(csp);
3461             len = 0;
3462          }
3463
3464 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3465          if (csp->flags & CSP_FLAG_CHUNKED)
3466          {
3467             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3468             {
3469                /* XXX: this is a temporary hack */
3470                log_error(LOG_LEVEL_CONNECT,
3471                   "Looks like we reached the end of the last chunk. "
3472                   "We better stop reading.");
3473                csp->expected_content_length = byte_count + (unsigned long long)len;
3474                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3475             }
3476          }
3477          reading_done:
3478 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3479
3480          /*
3481           * This is guaranteed by allocating with zalloc_or_die()
3482           * and never (intentionally) writing to the last byte.
3483           *
3484           * csp->receive_buffer_size is the size of the part of the
3485           * buffer we intentionally write to, but we actually
3486           * allocated csp->receive_buffer_size+1 bytes so the assertion
3487           * stays within the allocated range.
3488           */
3489          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3490
3491          /*
3492           * Add a trailing zero to let be able to use string operations.
3493           * XXX: do we still need this with filter_popups gone?
3494           */
3495          assert(len <= csp->receive_buffer_size);
3496          csp->receive_buffer[len] = '\0';
3497
3498          /*
3499           * Normally, this would indicate that we've read
3500           * as much as the server has sent us and we can
3501           * close the client connection.  However, Microsoft
3502           * in its wisdom has released IIS/5 with a bug that
3503           * prevents it from sending the trailing \r\n in
3504           * a 302 redirect header (and possibly other headers).
3505           * To work around this if we've haven't parsed
3506           * a full header we'll append a trailing \r\n
3507           * and see if this now generates a valid one.
3508           *
3509           * This hack shouldn't have any impacts.  If we've
3510           * already transmitted the header or if this is a
3511           * SSL connection, then we won't bother with this
3512           * hack.  So we only work on partially received
3513           * headers.  If we append a \r\n and this still
3514           * doesn't generate a valid header, then we won't
3515           * transmit anything to the client.
3516           */
3517          if (len == 0)
3518          {
3519
3520             if (server_body || (http->ssl
3521 #ifdef FEATURE_HTTPS_INSPECTION
3522                   && use_ssl_tunnel
3523 #endif
3524                ))
3525             {
3526                /*
3527                 * If we have been buffering up the document,
3528                 * now is the time to apply content modification
3529                 * and send the result to the client.
3530                 */
3531                if (buffer_and_filter_content)
3532                {
3533                   p = execute_content_filters(csp);
3534                   /*
3535                    * If content filtering fails, use the original
3536                    * buffer and length.
3537                    * (see p != NULL ? p : csp->iob->cur below)
3538                    */
3539                   if (NULL == p)
3540                   {
3541                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3542                   }
3543 #ifdef FEATURE_COMPRESSION
3544                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3545                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3546                   {
3547                      char *compressed_content = compress_buffer(p,
3548                         (size_t *)&csp->content_length, csp->config->compression_level);
3549                      if (compressed_content != NULL)
3550                      {
3551                         freez(p);
3552                         p = compressed_content;
3553                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3554                      }
3555                   }
3556 #endif
3557
3558                   if (JB_ERR_OK != update_server_headers(csp))
3559                   {
3560                      log_error(LOG_LEVEL_FATAL,
3561                         "Failed to update server headers. after filtering.");
3562                   }
3563
3564                   hdr = list_to_text(csp->headers);
3565                   if (hdr == NULL)
3566                   {
3567                      /* FIXME Should handle error properly */
3568                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3569                   }
3570
3571 #ifdef FEATURE_HTTPS_INSPECTION
3572                   /*
3573                    * Sending data with standard or secured connection (HTTP/HTTPS)
3574                    */
3575                   if (client_use_ssl(csp))
3576                   {
3577                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3578                               (const unsigned char *)hdr, strlen(hdr),
3579                               get_write_delay(csp)) < 0)
3580                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3581                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3582                               csp->content_length, get_write_delay(csp)) < 0))
3583                      {
3584                         log_error(LOG_LEVEL_ERROR,
3585                            "Failed to send the modified content to the client over TLS");
3586                         freez(hdr);
3587                         freez(p);
3588                         mark_server_socket_tainted(csp);
3589                         close_client_and_server_ssl_connections(csp);
3590                         return;
3591                      }
3592                   }
3593                   else
3594 #endif /* def FEATURE_HTTPS_INSPECTION */
3595                   {
3596                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3597                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3598                          (size_t)csp->content_length, write_delay))
3599                      {
3600                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3601                         freez(hdr);
3602                         freez(p);
3603                         mark_server_socket_tainted(csp);
3604                         return;
3605                      }
3606                   }
3607
3608                   freez(hdr);
3609                   freez(p);
3610                }
3611
3612                break; /* "game over, man" */
3613             }
3614
3615             /*
3616              * This is not the body, so let's pretend the server just sent
3617              * us a blank line.
3618              */
3619             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3620             len = (int)strlen(csp->receive_buffer);
3621
3622             /*
3623              * Now, let the normal header parsing algorithm below do its
3624              * job.  If it fails, we'll exit instead of continuing.
3625              */
3626
3627             ms_iis5_hack = 1;
3628          }
3629
3630          /*
3631           * If we're in the body of the server document, just write it to
3632           * the client, unless we need to buffer the body for later
3633           * content-filtering.
3634           */
3635          if (server_body || (http->ssl
3636 #ifdef FEATURE_HTTPS_INSPECTION
3637                && use_ssl_tunnel
3638 #endif
3639             ))
3640          {
3641             if (buffer_and_filter_content)
3642             {
3643                /*
3644                 * If there is no memory left for buffering the content, or the buffer limit
3645                 * has been reached, switch to non-filtering mode, i.e. make & write the
3646                 * header, flush the iob and buf, and get out of the way.
3647                 */
3648                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3649                {
3650                   size_t hdrlen;
3651                   long flushed;
3652
3653                   log_error(LOG_LEVEL_INFO,
3654                      "Flushing header and buffers. Stepping back from filtering.");
3655
3656                   hdr = list_to_text(csp->headers);
3657                   if (hdr == NULL)
3658                   {
3659                      /*
3660                       * Memory is too tight to even generate the header.
3661                       * Send our static "Out-of-memory" page.
3662                       */
3663                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3664                      rsp = cgi_error_memory();
3665                      send_crunch_response(csp, rsp);
3666                      mark_server_socket_tainted(csp);
3667 #ifdef FEATURE_HTTPS_INSPECTION
3668                      close_client_and_server_ssl_connections(csp);
3669 #endif
3670                      return;
3671                   }
3672                   hdrlen = strlen(hdr);
3673
3674 #ifdef FEATURE_HTTPS_INSPECTION
3675                   /*
3676                    * Sending data with standard or secured connection (HTTP/HTTPS)
3677                    */
3678                   if (client_use_ssl(csp))
3679                   {
3680                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3681                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3682                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3683                                 csp->iob)) < 0)
3684                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3685                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3686                               get_write_delay(csp)) < 0))
3687                      {
3688                         log_error(LOG_LEVEL_CONNECT,
3689                            "Flush header and buffers to client failed");
3690                         freez(hdr);
3691                         mark_server_socket_tainted(csp);
3692                         close_client_and_server_ssl_connections(csp);
3693                         return;
3694                      }
3695                   }
3696                   else
3697 #endif /* def FEATURE_HTTPS_INSPECTION */
3698                   {
3699                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3700                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3701                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3702                             write_delay))
3703                      {
3704                         log_error(LOG_LEVEL_CONNECT,
3705                            "Flush header and buffers to client failed: %E");
3706                         freez(hdr);
3707                         mark_server_socket_tainted(csp);
3708                         return;
3709                      }
3710                   }
3711
3712                   /*
3713                    * Reset the byte_count to the amount of bytes
3714                    * we just flushed. len will be added a few lines below,
3715                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3716                    */
3717                   byte_count = (unsigned long long)flushed;
3718                   freez(hdr);
3719                   buffer_and_filter_content = 0;
3720                   server_body = 1;
3721                }
3722             }
3723             else
3724             {
3725 #ifdef FEATURE_HTTPS_INSPECTION
3726                /*
3727                 * Sending data with standard or secured connection (HTTP/HTTPS)
3728                 */
3729                if (client_use_ssl(csp))
3730                {
3731                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3732                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3733                      get_write_delay(csp));
3734                   if (ret < 0)
3735                   {
3736                      log_error(LOG_LEVEL_ERROR,
3737                         "Sending data to client failed");
3738                      mark_server_socket_tainted(csp);
3739                      close_client_and_server_ssl_connections(csp);
3740                      return;
3741                   }
3742                }
3743                else
3744 #endif /* def FEATURE_HTTPS_INSPECTION */
3745                {
3746                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3747                         (size_t)len, write_delay))
3748                   {
3749                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3750                      mark_server_socket_tainted(csp);
3751                      return;
3752                   }
3753                }
3754             }
3755             byte_count += (unsigned long long)len;
3756             continue;
3757          }
3758          else
3759          {
3760             /*
3761              * We're still looking for the end of the server's header.
3762              * Buffer up the data we just read.  If that fails, there's
3763              * little we can do but send our static out-of-memory page.
3764              */
3765             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3766             {
3767                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3768                rsp = cgi_error_memory();
3769                send_crunch_response(csp, rsp);
3770                mark_server_socket_tainted(csp);
3771 #ifdef FEATURE_HTTPS_INSPECTION
3772                close_client_and_server_ssl_connections(csp);
3773 #endif
3774                return;
3775             }
3776
3777             /* Convert iob into something sed() can digest */
3778             if (JB_ERR_PARSE == get_server_headers(csp))
3779             {
3780                if (ms_iis5_hack)
3781                {
3782                   /*
3783                    * Well, we tried our MS IIS/5 hack and it didn't work.
3784                    * The header is incomplete and there isn't anything
3785                    * we can do about it.
3786                    */
3787                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3788                      "Applying the MS IIS5 hack didn't help.");
3789                   log_error(LOG_LEVEL_CLF,
3790                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3791 #ifdef FEATURE_HTTPS_INSPECTION
3792                   /*
3793                    * Sending data with standard or secured connection (HTTP/HTTPS)
3794                    */
3795                   if (client_use_ssl(csp))
3796                   {
3797                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3798                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3799                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3800                   }
3801                   else
3802 #endif /* def FEATURE_HTTPS_INSPECTION */
3803                   {
3804                      write_socket_delayed(csp->cfd,
3805                         INVALID_SERVER_HEADERS_RESPONSE,
3806                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3807                   }
3808                   mark_server_socket_tainted(csp);
3809 #ifdef FEATURE_HTTPS_INSPECTION
3810                   close_client_and_server_ssl_connections(csp);
3811 #endif
3812                   return;
3813                }
3814                else
3815                {
3816                   /*
3817                    * Since we have to wait for more from the server before
3818                    * we can parse the headers we just continue here.
3819                    */
3820                   log_error(LOG_LEVEL_CONNECT,
3821                      "Continuing buffering server headers from socket %d. "
3822                      "Bytes most recently read: %ld.", csp->cfd, len);
3823                   continue;
3824                }
3825             }
3826             else
3827             {
3828                /*
3829                 * Account for the content bytes we
3830                 * might have gotten with the headers.
3831                 */
3832                assert(csp->iob->eod >= csp->iob->cur);
3833                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3834             }
3835
3836             /* Did we actually get anything? */
3837             if (NULL == csp->headers->first)
3838             {
3839                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3840                {
3841                   log_error(LOG_LEVEL_ERROR,
3842                      "No server or forwarder response received on socket %d. "
3843                      "Closing client socket %d without sending data.",
3844                      csp->server_connection.sfd, csp->cfd);
3845                   log_error(LOG_LEVEL_CLF,
3846                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3847                }
3848                else
3849                {
3850                   log_error(LOG_LEVEL_ERROR,
3851                      "No server or forwarder response received on socket %d.",
3852                      csp->server_connection.sfd);
3853                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3854                }
3855                free_http_request(http);
3856                mark_server_socket_tainted(csp);
3857 #ifdef FEATURE_HTTPS_INSPECTION
3858                close_client_and_server_ssl_connections(csp);
3859 #endif
3860                return;
3861             }
3862
3863             if (!csp->headers->first->str)
3864             {
3865                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3866             }
3867             assert(csp->headers->first->str);
3868
3869             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3870                 strncmpic(csp->headers->first->str, "ICY", 3))
3871             {
3872                /*
3873                 * It doesn't look like a HTTP (or Shoutcast) response:
3874                 * tell the client and log the problem.
3875                 */
3876                if (strlen(csp->headers->first->str) > 30)
3877                {
3878                   csp->headers->first->str[30] = '\0';
3879                }
3880                log_error(LOG_LEVEL_ERROR,
3881                   "Invalid server or forwarder response. Starts with: %s",
3882                   csp->headers->first->str);
3883                log_error(LOG_LEVEL_CLF,
3884                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3885 #ifdef FEATURE_HTTPS_INSPECTION
3886                /*
3887                 * Sending data with standard or secured connection (HTTP/HTTPS)
3888                 */
3889                if (client_use_ssl(csp))
3890                {
3891                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3892                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3893                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3894                      get_write_delay(csp));
3895                }
3896                else
3897 #endif /* def FEATURE_HTTPS_INSPECTION */
3898                {
3899                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3900                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3901                }
3902                free_http_request(http);
3903                mark_server_socket_tainted(csp);
3904 #ifdef FEATURE_HTTPS_INSPECTION
3905                close_client_and_server_ssl_connections(csp);
3906 #endif
3907                return;
3908             }
3909
3910             /*
3911              * Disable redirect checkers, so that they will be only run
3912              * again if the user also enables them through tags.
3913              *
3914              * From a performance point of view it doesn't matter,
3915              * but it prevents duplicated log messages.
3916              */
3917 #ifdef FEATURE_FAST_REDIRECTS
3918             csp->action->flags &= ~ACTION_FAST_REDIRECTS;
3919 #endif
3920             csp->action->flags &= ~ACTION_REDIRECT;
3921
3922             /*
3923              * We have now received the entire server header,
3924              * filter it and send the result to the client
3925              */
3926             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3927             {
3928                log_error(LOG_LEVEL_CLF,
3929                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3930 #ifdef FEATURE_HTTPS_INSPECTION
3931                /*
3932                 * Sending data with standard or secured connection (HTTP/HTTPS)
3933                 */
3934                if (client_use_ssl(csp))
3935                {
3936                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3937                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3938                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3939                      get_write_delay(csp));
3940                }
3941                else
3942 #endif
3943                {
3944                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3945                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3946                }
3947                free_http_request(http);
3948                mark_server_socket_tainted(csp);
3949 #ifdef FEATURE_HTTPS_INSPECTION
3950                close_client_and_server_ssl_connections(csp);
3951 #endif
3952                return;
3953             }
3954             hdr = list_to_text(csp->headers);
3955             if (hdr == NULL)
3956             {
3957                /* FIXME Should handle error properly */
3958                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3959             }
3960
3961             if ((csp->flags & CSP_FLAG_CHUNKED)
3962                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3963                && ((csp->iob->eod - csp->iob->cur) >= 5)
3964                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3965             {
3966                log_error(LOG_LEVEL_CONNECT,
3967                   "Looks like we got the last chunk together with "
3968                   "the server headers. We better stop reading.");
3969                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3970                csp->expected_content_length = byte_count;
3971                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3972             }
3973
3974             csp->server_connection.response_received = time(NULL);
3975
3976             if (crunch_response_triggered(csp, crunchers_light))
3977             {
3978                /*
3979                 * One of the tags created by a server-header
3980                 * tagger triggered a crunch. We already
3981                 * delivered the crunch response to the client
3982                 * and are done here after cleaning up.
3983                 */
3984                freez(hdr);
3985                mark_server_socket_tainted(csp);
3986 #ifdef FEATURE_HTTPS_INSPECTION
3987                close_client_and_server_ssl_connections(csp);
3988 #endif
3989                return;
3990             }
3991
3992             /* Buffer and pcrs filter this if appropriate. */
3993             buffer_and_filter_content = content_requires_filtering(csp);
3994
3995             if (!buffer_and_filter_content)
3996             {
3997                /*
3998                 * Write the server's (modified) header to
3999                 * the client (along with anything else that
4000                 * may be in the buffer). Use standard or secured
4001                 * connection.
4002                 */
4003 #ifdef FEATURE_HTTPS_INSPECTION
4004                if (client_use_ssl(csp))
4005                {
4006                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
4007                           (const unsigned char *)hdr, strlen(hdr),
4008                           get_write_delay(csp)) < 0)
4009                      || ((len = ssl_flush_socket(&(csp->ssl_client_attr),
4010                             csp->iob)) < 0))
4011                   {
4012                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
4013
4014                      /*
4015                       * The write failed, so don't bother mentioning it
4016                       * to the client... it probably can't hear us anyway.
4017                       */
4018                      freez(hdr);
4019                      mark_server_socket_tainted(csp);
4020 #ifdef FEATURE_HTTPS_INSPECTION
4021                      close_client_and_server_ssl_connections(csp);
4022 #endif
4023                      return;
4024                   }
4025                }
4026                else
4027 #endif /* def FEATURE_HTTPS_INSPECTION */
4028                {
4029                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
4030                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
4031                   {
4032                      log_error(LOG_LEVEL_ERROR,
4033                         "write header to client failed");
4034                      /*
4035                       * The write failed, so don't bother mentioning it
4036                       * to the client... it probably can't hear us anyway.
4037                       */
4038                      freez(hdr);
4039                      mark_server_socket_tainted(csp);
4040                      return;
4041                   }
4042                }
4043                                 }
4044
4045             /* we're finished with the server's header */
4046
4047             freez(hdr);
4048             server_body = 1;
4049
4050             /*
4051              * If this was a MS IIS/5 hack then it means the server
4052              * has already closed the connection. Nothing more to read.
4053              * Time to bail.
4054              */
4055             if (ms_iis5_hack)
4056             {
4057                log_error(LOG_LEVEL_ERROR,
4058                   "Closed server connection detected. "
4059                   "Applying the MS IIS5 hack didn't help.");
4060                log_error(LOG_LEVEL_CLF,
4061                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4062 #ifdef FEATURE_HTTPS_INSPECTION
4063                /*
4064                 * Sending data with standard or secured connection (HTTP/HTTPS)
4065                 */
4066                if (client_use_ssl(csp))
4067                {
4068                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4069                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4070                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4071                      get_write_delay(csp));
4072                }
4073                else
4074 #endif /* def FEATURE_HTTPS_INSPECTION */
4075                {
4076                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4077                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4078                }
4079                mark_server_socket_tainted(csp);
4080 #ifdef FEATURE_HTTPS_INSPECTION
4081                close_client_and_server_ssl_connections(csp);
4082 #endif
4083                return;
4084             }
4085          }
4086          continue;
4087       }
4088       mark_server_socket_tainted(csp);
4089 #ifdef FEATURE_HTTPS_INSPECTION
4090       close_client_and_server_ssl_connections(csp);
4091 #endif
4092       return; /* huh? we should never get here */
4093    }
4094
4095    if (csp->content_length == 0)
4096    {
4097       /*
4098        * If Privoxy didn't recalculate the Content-Length,
4099        * byte_count is still correct.
4100        */
4101       csp->content_length = byte_count;
4102    }
4103
4104 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4105    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4106       && (csp->expected_content_length != byte_count))
4107    {
4108       log_error(LOG_LEVEL_CONNECT,
4109          "Received %llu bytes while expecting %llu.",
4110          byte_count, csp->expected_content_length);
4111       mark_server_socket_tainted(csp);
4112    }
4113 #endif
4114
4115 #ifdef FEATURE_HTTPS_INSPECTION
4116    if (client_use_ssl(csp))
4117    {
4118       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
4119          csp->ip_addr_str, http->gpc, http->hostport, http->path,
4120          http->version, csp->content_length);
4121    }
4122    else
4123 #endif
4124    {
4125       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
4126          csp->ip_addr_str, http->ocmd, csp->content_length);
4127    }
4128    csp->server_connection.timestamp = time(NULL);
4129 }
4130
4131
4132 /*********************************************************************
4133  *
4134  * Function    :  chat
4135  *
4136  * Description :  Once a connection from the client has been accepted,
4137  *                this function is called (via serve()) to handle the
4138  *                main business of the communication.  This function
4139  *                returns after dealing with a single request. It can
4140  *                be called multiple times with the same client socket
4141  *                if the client is keeping the connection alive.
4142  *
4143  *                The decision whether or not a client connection will
4144  *                be kept alive is up to the caller which also must
4145  *                close the client socket when done.
4146  *
4147  *                FIXME: chat is nearly thousand lines long.
4148  *                Ridiculous.
4149  *
4150  * Parameters  :
4151  *          1  :  csp = Current client state (buffers, headers, etc...)
4152  *
4153  * Returns     :  Nothing.
4154  *
4155  *********************************************************************/
4156 static void chat(struct client_state *csp)
4157 {
4158    const struct forward_spec *fwd;
4159    struct http_request *http;
4160    /* Skeleton for HTTP response, if we should intercept the request */
4161    struct http_response *rsp;
4162 #ifdef FEATURE_HTTPS_INSPECTION
4163    int use_ssl_tunnel = 0;
4164 #endif
4165
4166    http = csp->http;
4167
4168    if (receive_client_request(csp) != JB_ERR_OK)
4169    {
4170       return;
4171    }
4172    if (parse_client_request(csp) != JB_ERR_OK)
4173    {
4174       return;
4175    }
4176
4177 #ifdef FEATURE_HTTPS_INSPECTION
4178    /*
4179     * Setting flags to use old solution with SSL tunnel and to disable
4180     * certificate verification.
4181     */
4182    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
4183       && !cgi_page_requested(csp->http->host))
4184    {
4185       use_ssl_tunnel = 1;
4186    }
4187
4188    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
4189    {
4190       csp->dont_verify_certificate = 1;
4191    }
4192 #endif
4193
4194    /*
4195     * build the http request to send to the server
4196     * we have to do one of the following:
4197     *
4198     * create =    use the original HTTP request to create a new
4199     *             HTTP request that has either the path component
4200     *             without the http://domainspec (w/path) or the
4201     *             full orininal URL (w/url)
4202     *             Note that the path and/or the HTTP version may
4203     *             have been altered by now.
4204     *
4205     * SSL proxy = Open a socket to the host:port of the server
4206     *             and create TLS/SSL connection with server and
4207     *             with client. Then behave like mediator between
4208     *             client and server over TLS/SSL.
4209     *
4210     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4211     *    with     request to a parent proxy. Note that we'll be sending
4212     * forwarding  the CFAIL message ourselves if connecting to the parent
4213     *             fails, but we won't send a CSUCCEED message if it works,
4214     *             since that would result in a double message (ours and the
4215     *             parent's). After sending the request to the parent, we
4216     *             must parse answer and send it to client. If connection
4217     *             with server is established, we do TLS/SSL proxy. Otherwise
4218     *             we send parent response to client and close connections.
4219     *
4220     * here's the matrix:
4221     *                        SSL
4222     *                    0        1
4223     *                +--------+--------+
4224     *                |        |        |
4225     *             0  | create |   SSL  |
4226     *                | w/path |  proxy |
4227     *  Forwarding    +--------+--------+
4228     *                |        |   SSL  |
4229     *             1  | create |  proxy |
4230     *                | w/url  |+forward|
4231     *                +--------+--------+
4232     *
4233     */
4234
4235 #ifdef FEATURE_HTTPS_INSPECTION
4236    /*
4237     * Presetting SSL client and server flags
4238     */
4239    if (http->ssl && !use_ssl_tunnel)
4240    {
4241       http->client_ssl = 1;
4242       http->server_ssl = 1;
4243    }
4244    else
4245    {
4246       http->client_ssl = 0;
4247       http->server_ssl = 0;
4248    }
4249 #endif
4250
4251 #ifdef FEATURE_HTTPS_INSPECTION
4252    /*
4253     * Log the request unless we're https inspecting
4254     * in which case we don't have the path yet and
4255     * will log the request later.
4256     */
4257    if (!client_use_ssl(csp))
4258 #endif
4259    {
4260       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4261    }
4262
4263    if (http->ssl && connect_port_is_forbidden(csp))
4264    {
4265       const char *acceptable_connect_ports =
4266          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4267       assert(NULL != acceptable_connect_ports);
4268       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4269          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4270          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4271       csp->action->flags |= ACTION_BLOCK;
4272       http->ssl = 0;
4273 #ifdef FEATURE_HTTPS_INSPECTION
4274       http->client_ssl = 0;
4275       http->server_ssl = 0;
4276 #endif
4277    }
4278
4279    /*
4280     * We have a request. Check if one of the crunchers wants it
4281     * unless the client wants to use TLS/SSL in which case we
4282     * haven't setup the TLS context yet and will send the crunch
4283     * response later.
4284     */
4285    if (
4286 #ifdef FEATURE_HTTPS_INSPECTION
4287        !client_use_ssl(csp) &&
4288 #endif
4289        crunch_response_triggered(csp, crunchers_all))
4290    {
4291       /*
4292        * Yes. The client got the crunch response and we're done here.
4293        */
4294       return;
4295    }
4296
4297 #ifdef FEATURE_HTTPS_INSPECTION
4298    if (client_use_ssl(csp) && !use_ssl_tunnel)
4299    {
4300       int ret;
4301       /*
4302        * Creating a SSL proxy.
4303        *
4304        * By sending the CSUCCEED message we're lying to the client as
4305        * the connection hasn't actually been established yet. We don't
4306        * establish the connection until we have seen and parsed the
4307        * encrypted client headers.
4308        */
4309       if (write_socket_delayed(csp->cfd, CSUCCEED,
4310             strlen(CSUCCEED), get_write_delay(csp)) != 0)
4311       {
4312          log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4313          return;
4314       }
4315
4316       ret = create_client_ssl_connection(csp);
4317       if (ret != 0)
4318       {
4319          log_error(LOG_LEVEL_ERROR,
4320             "Failed to open a secure connection with the client");
4321          return;
4322       }
4323       if (JB_ERR_OK != process_encrypted_request_headers(csp))
4324       {
4325          close_client_ssl_connection(csp);
4326          return;
4327       }
4328       /*
4329        * We have an encrypted request. Check if one of the crunchers now
4330        * wants it (for example because the previously invisible path was
4331        * required to match).
4332        */
4333       if (crunch_response_triggered(csp, crunchers_all))
4334       {
4335          /*
4336           * Yes. The client got the crunch response and we're done here.
4337           */
4338          return;
4339       }
4340    }
4341 #endif
4342
4343    /* decide how to route the HTTP request */
4344    fwd = forward_url(csp, http);
4345
4346    freez(csp->headers->first->str);
4347    build_request_line(csp, fwd, &csp->headers->first->str);
4348
4349    log_applied_actions(csp->action);
4350    if (fwd->forward_host)
4351    {
4352       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4353          fwd->forward_host, fwd->forward_port, http->hostport);
4354    }
4355    else
4356    {
4357       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4358    }
4359
4360    /* here we connect to the server, gateway, or the forwarder */
4361
4362 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4363    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4364       && socket_is_still_alive(csp->server_connection.sfd)
4365       && connection_destination_matches(&csp->server_connection, http, fwd))
4366    {
4367       log_error(LOG_LEVEL_CONNECT,
4368          "Reusing server socket %d connected to %s. Total requests: %u.",
4369          csp->server_connection.sfd, csp->server_connection.host,
4370          csp->server_connection.requests_sent_total);
4371    }
4372    else
4373    {
4374       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4375       {
4376 #ifdef FEATURE_CONNECTION_SHARING
4377          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4378 #ifdef FEATURE_HTTPS_INSPECTION
4379             && !server_use_ssl(csp)
4380 #endif
4381             )
4382          {
4383             remember_connection(&csp->server_connection);
4384          }
4385          else
4386 #endif /* def FEATURE_CONNECTION_SHARING */
4387          {
4388             log_error(LOG_LEVEL_CONNECT,
4389                "Closing server socket %d connected to %s. Total requests: %u.",
4390                csp->server_connection.sfd, csp->server_connection.host,
4391                csp->server_connection.requests_sent_total);
4392             close_socket(csp->server_connection.sfd);
4393          }
4394          mark_connection_closed(&csp->server_connection);
4395       }
4396 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4397
4398       /*
4399        * Connecting to destination server
4400        */
4401       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4402
4403       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4404       {
4405          if (fwd->type != SOCKS_NONE)
4406          {
4407             /* Socks error. */
4408             rsp = error_response(csp, "forwarding-failed");
4409          }
4410          else if (errno == EINVAL)
4411          {
4412             rsp = error_response(csp, "no-such-domain");
4413          }
4414          else
4415          {
4416             rsp = error_response(csp, "connect-failed");
4417          }
4418
4419          /* Write the answer to the client */
4420          if (rsp != NULL)
4421          {
4422             send_crunch_response(csp, rsp);
4423          }
4424
4425          /*
4426           * Temporary workaround to prevent already-read client
4427           * bodies from being parsed as new requests. For now we
4428           * err on the safe side and throw all the following
4429           * requests under the bus, even if no client body has been
4430           * buffered. A compliant client will repeat the dropped
4431           * requests on an untainted connection.
4432           *
4433           * The proper fix is to discard the no longer needed
4434           * client body in the buffer (if there is one) and to
4435           * continue parsing the bytes that follow.
4436           */
4437 #ifdef FEATURE_HTTPS_INSPECTION
4438          close_client_ssl_connection(csp);
4439 #endif
4440          drain_and_close_socket(csp->cfd);
4441          csp->cfd = JB_INVALID_SOCKET;
4442
4443          return;
4444       }
4445
4446 #ifdef FEATURE_HTTPS_INSPECTION
4447       /*
4448        * Creating TLS/SSL connections with destination server or parent
4449        * proxy. If forwarding is enabled, we must send client request to
4450        * parent proxy and receive, parse and resend parent proxy answer.
4451        */
4452       if (http->ssl && !use_ssl_tunnel)
4453       {
4454          if (fwd->forward_host != NULL)
4455          {
4456             char server_response[BUFFER_SIZE];
4457             int ret = 0;
4458             int len = 0;
4459             char *hdr = list_to_text(csp->headers);
4460             memset(server_response, 0, sizeof(server_response));
4461
4462             if (hdr == NULL)
4463             {
4464                log_error(LOG_LEVEL_FATAL,
4465                   "Out of memory parsing client header");
4466             }
4467             list_remove_all(csp->headers);
4468
4469             /*
4470              * Sending client's CONNECT request to the parent proxy
4471              */
4472             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4473
4474             freez(hdr);
4475
4476             if (ret != 0)
4477             {
4478                log_error(LOG_LEVEL_CONNECT,
4479                   "Sending request headers to: %s failed", http->hostport);
4480                mark_server_socket_tainted(csp);
4481                close_client_ssl_connection(csp);
4482                return;
4483             }
4484
4485             /* Waiting for parent proxy server response */
4486             len = read_socket(csp->server_connection.sfd, server_response,
4487                sizeof(server_response)-1);
4488
4489             if (len <= 0)
4490             {
4491                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4492                   "server on socket %d.", csp->server_connection.sfd);
4493
4494                rsp = error_response(csp, "no-server-data");
4495                if (rsp)
4496                {
4497                   send_crunch_response(csp, rsp);
4498                }
4499                mark_server_socket_tainted(csp);
4500                close_client_ssl_connection(csp);
4501                return;
4502             }
4503
4504             /*
4505              * Test if the connection to the destination server was
4506              * established successfully by the parent proxy.
4507              */
4508             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4509             {
4510                log_error(LOG_LEVEL_ERROR,
4511                   "The forwarder %s failed to establish a connection with %s",
4512                   fwd->forward_host, http->host);
4513                rsp = error_response(csp, "connect-failed");
4514                if (rsp)
4515                {
4516                   send_crunch_response(csp, rsp);
4517                }
4518                mark_server_socket_tainted(csp);
4519                close_client_ssl_connection(csp);
4520                return;
4521             }
4522          } /* -END- if (fwd->forward_host != NULL) */
4523
4524          /*
4525           * We can now create the TLS/SSL connection with the destination server.
4526           */
4527          int ret = create_server_ssl_connection(csp);
4528          if (ret != 0)
4529          {
4530             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4531                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4532             {
4533                /*
4534                 * If the server certificate is invalid, we must inform
4535                 * the client and then close connection to the client.
4536                 */
4537                ssl_send_certificate_error(csp);
4538                close_client_and_server_ssl_connections(csp);
4539                return;
4540             }
4541             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4542              || csp->server_cert_verification_result == SSL_CERT_VALID)
4543             {
4544                /*
4545                 * The TLS/SSL connection wasn't created but an invalid
4546                 * certificate wasn't detected. Report it as connection
4547                 * failure.
4548                 */
4549                rsp = error_response(csp, "connect-failed");
4550                if (rsp)
4551                {
4552                   send_crunch_response(csp, rsp);
4553                }
4554                close_client_and_server_ssl_connections(csp);
4555                return;
4556             }
4557          }
4558       }/* -END- if (http->ssl) */
4559 #endif /* def FEATURE_HTTPS_INSPECTION */
4560
4561 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4562       save_connection_destination(csp->server_connection.sfd,
4563          http, fwd, &csp->server_connection);
4564       csp->server_connection.keep_alive_timeout =
4565          (unsigned)csp->config->keep_alive_timeout;
4566    }
4567 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4568
4569    csp->server_connection.requests_sent_total++;
4570
4571    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4572    {
4573       /* Client headers have been sent optimistically */
4574       assert(csp->headers->last == NULL);
4575    }
4576    else if (http->ssl == 0 || (fwd->forward_host
4577 #ifdef FEATURE_HTTPS_INSPECTION
4578          && use_ssl_tunnel
4579 #endif
4580            ))
4581    {
4582       if (send_http_request(csp))
4583       {
4584          rsp = error_response(csp, "connect-failed");
4585          if (rsp)
4586          {
4587             send_crunch_response(csp, rsp);
4588          }
4589          return;
4590       }
4591    }
4592    else
4593    {
4594       /*
4595        * Using old solution with SSL tunnel or new solution with SSL proxy
4596        */
4597       list_remove_all(csp->headers);
4598 #ifdef FEATURE_HTTPS_INSPECTION
4599       if (use_ssl_tunnel)
4600 #endif
4601       {
4602          /*
4603          * We're running an SSL tunnel and we're not forwarding,
4604          * so just ditch the client headers, send the "connect succeeded"
4605          * message to the client, flush the rest, and get out of the way.
4606          */
4607          if (write_socket_delayed(csp->cfd, CSUCCEED,
4608                strlen(CSUCCEED), get_write_delay(csp)))
4609          {
4610             return;
4611          }
4612       }
4613 #ifdef FEATURE_HTTPS_INSPECTION
4614       else
4615       {
4616          /*
4617           * If server certificate has been verified and is invalid,
4618           * we must inform the client and then close the connection
4619           * with client and server.
4620           */
4621          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4622              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4623          {
4624             ssl_send_certificate_error(csp);
4625             close_client_and_server_ssl_connections(csp);
4626             return;
4627          }
4628          if (send_https_request(csp))
4629          {
4630             rsp = error_response(csp, "connect-failed");
4631             if (rsp)
4632             {
4633                send_crunch_response(csp, rsp);
4634             }
4635             close_client_and_server_ssl_connections(csp);
4636             return;
4637          }
4638       }
4639 #endif /* def FEATURE_HTTPS_INSPECTION */
4640       clear_iob(csp->client_iob);
4641    }/* -END- else ... if (http->ssl == 1) */
4642
4643    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4644
4645    /* XXX: should the time start earlier for optimistically sent data? */
4646    csp->server_connection.request_sent = time(NULL);
4647
4648    handle_established_connection(csp);
4649    freez(csp->receive_buffer);
4650 }
4651
4652
4653 #ifdef FUZZ
4654 /*********************************************************************
4655  *
4656  * Function    :  fuzz_server_response
4657  *
4658  * Description :  Treat the input as a whole server response.
4659  *
4660  * Parameters  :
4661  *          1  :  csp = Current client state (buffers, headers, etc...)
4662  *          2  :  fuzz_input_file = File to read the input from.
4663  *
4664  * Returns     :  0
4665  *
4666  *********************************************************************/
4667 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4668 {
4669    static struct forward_spec fwd; /* Zero'd due to being static */
4670    csp->cfd = 0;
4671
4672    if (strcmp(fuzz_input_file, "-") == 0)
4673    {
4674       /* XXX: Doesn't work yet. */
4675       csp->server_connection.sfd = 0;
4676    }
4677    else
4678    {
4679       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4680       if (csp->server_connection.sfd == -1)
4681       {
4682          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4683             fuzz_input_file);
4684       }
4685    }
4686    csp->fwd = &fwd;
4687    csp->content_type |= CT_GIF;
4688    csp->action->flags |= ACTION_DEANIMATE;
4689    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4690
4691    csp->http->path = strdup_or_die("/");
4692    csp->http->host = strdup_or_die("fuzz.example.org");
4693    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4694    /* Prevent client socket monitoring */
4695    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4696    csp->flags |= CSP_FLAG_CHUNKED;
4697
4698    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4699    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4700
4701    csp->content_type |= CT_DECLARED|CT_GIF;
4702
4703    csp->config->socket_timeout = 0;
4704
4705    cgi_init_error_messages();
4706
4707    handle_established_connection(csp);
4708    freez(csp->receive_buffer);
4709
4710    return 0;
4711 }
4712 #endif
4713
4714
4715 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4716 /*********************************************************************
4717  *
4718  * Function    :  prepare_csp_for_next_request
4719  *
4720  * Description :  Put the csp in a mostly vergin state.
4721  *
4722  * Parameters  :
4723  *          1  :  csp = Current client state (buffers, headers, etc...)
4724  *
4725  * Returns     :  N/A
4726  *
4727  *********************************************************************/
4728 static void prepare_csp_for_next_request(struct client_state *csp)
4729 {
4730    csp->content_type = 0;
4731    csp->content_length = 0;
4732    csp->expected_content_length = 0;
4733    csp->expected_client_content_length = 0;
4734    list_remove_all(csp->headers);
4735    clear_iob(csp->iob);
4736    freez(csp->error_message);
4737    free_http_request(csp->http);
4738    destroy_list(csp->headers);
4739 #ifdef FEATURE_HTTPS_INSPECTION
4740    destroy_list(csp->https_headers);
4741 #endif
4742    destroy_list(csp->tags);
4743 #ifdef FEATURE_CLIENT_TAGS
4744    destroy_list(csp->client_tags);
4745    freez(csp->client_address);
4746 #endif
4747    free_current_action(csp->action);
4748    if (NULL != csp->fwd)
4749    {
4750       unload_forward_spec(csp->fwd);
4751       csp->fwd = NULL;
4752    }
4753    /* XXX: Store per-connection flags someplace else. */
4754    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4755 #ifdef FEATURE_TOGGLE
4756    if (global_toggle_state)
4757 #endif /* def FEATURE_TOGGLE */
4758    {
4759       csp->flags |= CSP_FLAG_TOGGLED_ON;
4760    }
4761
4762    if (csp->client_iob->eod > csp->client_iob->cur)
4763    {
4764       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4765       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4766
4767       assert(bytes_to_shift > 0);
4768       assert(data_length > 0);
4769
4770       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4771          data_length, bytes_to_shift);
4772       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4773       csp->client_iob->cur = csp->client_iob->buf;
4774       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4775       csp->client_iob->eod = csp->client_iob->buf + data_length;
4776       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4777
4778       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4779    }
4780    else
4781    {
4782       /*
4783        * We mainly care about resetting client_iob->cur so we don't
4784        * waste buffer space at the beginning and don't mess up the
4785        * request restoration done by cgi_show_request().
4786        *
4787        * Freeing the buffer itself isn't technically necessary,
4788        * but makes debugging more convenient.
4789        */
4790       clear_iob(csp->client_iob);
4791    }
4792 }
4793 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4794
4795
4796 /*********************************************************************
4797  *
4798  * Function    :  serve
4799  *
4800  * Description :  This is little more than chat.  We only "serve" to
4801  *                to close (or remember) any socket that chat may have
4802  *                opened.
4803  *
4804  * Parameters  :
4805  *          1  :  csp = Current client state (buffers, headers, etc...)
4806  *
4807  * Returns     :  N/A
4808  *
4809  *********************************************************************/
4810 static void serve(struct client_state *csp)
4811 {
4812    int config_file_change_detected = 0; /* Only used for debugging */
4813 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4814 #ifdef FEATURE_CONNECTION_SHARING
4815    static int monitor_thread_running = 0;
4816 #endif /* def FEATURE_CONNECTION_SHARING */
4817    int continue_chatting = 0;
4818
4819    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4820       csp->ip_addr_str, csp->cfd);
4821
4822    do
4823    {
4824       unsigned int latency;
4825
4826 #ifdef FEATURE_HTTPS_INSPECTION
4827       if (continue_chatting && client_use_ssl(csp))
4828       {
4829          continue_https_chat(csp);
4830       }
4831       else
4832 #endif
4833       {
4834          chat(csp);
4835       }
4836
4837       /*
4838        * If the request has been crunched,
4839        * the calculated latency is zero.
4840        */
4841       latency = (unsigned)(csp->server_connection.response_received -
4842          csp->server_connection.request_sent) / 2;
4843
4844       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4845          && (csp->flags & CSP_FLAG_CRUNCHED)
4846          && (csp->expected_client_content_length != 0))
4847       {
4848          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4849          log_error(LOG_LEVEL_CONNECT,
4850             "Tainting client socket %d due to unread data.", csp->cfd);
4851       }
4852
4853       continue_chatting = (csp->config->feature_flags
4854          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4855          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4856          && (csp->cfd != JB_INVALID_SOCKET)
4857          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4858          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4859             || (csp->flags & CSP_FLAG_CHUNKED));
4860
4861       if (!(csp->flags & CSP_FLAG_CRUNCHED)
4862          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4863       {
4864          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4865          {
4866             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4867          }
4868          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4869             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4870             || !socket_is_still_alive(csp->server_connection.sfd)
4871             || !(latency < csp->server_connection.keep_alive_timeout))
4872          {
4873             log_error(LOG_LEVEL_CONNECT,
4874                "Closing server socket %d connected to %s. "
4875                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
4876                csp->server_connection.sfd, (csp->server_connection.host != NULL) ?
4877                csp->server_connection.host : csp->http->host,
4878                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4879                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4880                socket_is_still_alive(csp->server_connection.sfd),
4881                csp->server_connection.keep_alive_timeout);
4882 #ifdef FEATURE_CONNECTION_SHARING
4883             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4884             {
4885                forget_connection(csp->server_connection.sfd);
4886             }
4887 #endif /* def FEATURE_CONNECTION_SHARING */
4888 #ifdef FEATURE_HTTPS_INSPECTION
4889             close_server_ssl_connection(csp);
4890 #endif
4891             close_socket(csp->server_connection.sfd);
4892             mark_connection_closed(&csp->server_connection);
4893 #ifdef FEATURE_HTTPS_INSPECTION
4894             if (continue_chatting && client_use_ssl(csp))
4895             {
4896                /*
4897                 * Close the client socket as well as Privoxy currently
4898                 * can't establish a new server connection when the client
4899                 * socket is reused and would drop the connection in
4900                 * continue_https_chat() anyway.
4901                 */
4902                continue_chatting = 0;
4903                csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4904                log_error(LOG_LEVEL_CONNECT,
4905                   "Client socket %d is no longer usable. "
4906                   "The server socket has been closed.", csp->cfd);
4907             }
4908 #endif
4909          }
4910       }
4911
4912       if (continue_chatting && any_loaded_file_changed(csp))
4913       {
4914          continue_chatting = 0;
4915          config_file_change_detected = 1;
4916       }
4917 #ifdef FEATURE_HTTPS_INSPECTION
4918       if (continue_chatting && client_use_ssl(csp) &&
4919          csp->ssl_with_client_is_opened == 0)
4920       {
4921          continue_chatting = 0;
4922          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
4923             "The TLS session has been terminated.", csp->cfd);
4924       }
4925 #endif
4926
4927       if (continue_chatting)
4928       {
4929          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4930             && socket_is_still_alive(csp->cfd))
4931          {
4932             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4933                "pipelined on socket %d and the socket is still alive.",
4934                csp->requests_received_total+1, csp->cfd);
4935             prepare_csp_for_next_request(csp);
4936             continue;
4937          }
4938
4939          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
4940          {
4941             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4942             {
4943                log_error(LOG_LEVEL_CONNECT,
4944                   "Waiting for the next client request on socket %d. "
4945                   "Keeping the server socket %d to %s open.",
4946                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
4947             }
4948             else
4949             {
4950                log_error(LOG_LEVEL_CONNECT,
4951                   "Waiting for the next client request on socket %d. "
4952                   "No server socket to keep open.", csp->cfd);
4953             }
4954          }
4955
4956          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4957             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
4958             && socket_is_still_alive(csp->cfd))
4959          {
4960             log_error(LOG_LEVEL_CONNECT,
4961                "Data arrived in time on client socket %d. Requests so far: %u",
4962                csp->cfd, csp->requests_received_total);
4963             prepare_csp_for_next_request(csp);
4964          }
4965          else
4966          {
4967 #ifdef FEATURE_CONNECTION_SHARING
4968             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4969                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
4970                && (socket_is_still_alive(csp->server_connection.sfd))
4971 #ifdef FEATURE_HTTPS_INSPECTION
4972                && !server_use_ssl(csp)
4973 #endif
4974                 )
4975             {
4976                time_t time_open = time(NULL) - csp->server_connection.timestamp;
4977
4978                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
4979                {
4980                   break;
4981                }
4982
4983                remember_connection(&csp->server_connection);
4984                csp->server_connection.sfd = JB_INVALID_SOCKET;
4985                drain_and_close_socket(csp->cfd);
4986                csp->cfd = JB_INVALID_SOCKET;
4987                privoxy_mutex_lock(&connection_reuse_mutex);
4988                if (!monitor_thread_running)
4989                {
4990                   monitor_thread_running = 1;
4991                   privoxy_mutex_unlock(&connection_reuse_mutex);
4992                   wait_for_alive_connections();
4993                   privoxy_mutex_lock(&connection_reuse_mutex);
4994                   monitor_thread_running = 0;
4995                }
4996                privoxy_mutex_unlock(&connection_reuse_mutex);
4997             }
4998 #endif /* def FEATURE_CONNECTION_SHARING */
4999             break;
5000          }
5001       }
5002       else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5003       {
5004          log_error(LOG_LEVEL_CONNECT,
5005             "Closing server socket %d connected to %s. Keep-alive: %u. "
5006             "Tainted: %u. Socket alive: %u. Timeout: %u. "
5007             "Configuration file change detected: %u",
5008             csp->server_connection.sfd, csp->server_connection.host,
5009             0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5010             0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5011             socket_is_still_alive(csp->server_connection.sfd),
5012             csp->server_connection.keep_alive_timeout,
5013             config_file_change_detected);
5014       }
5015    } while (continue_chatting);
5016
5017 #else
5018    chat(csp);
5019 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5020
5021    if (csp->cfd != JB_INVALID_SOCKET)
5022    {
5023       log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
5024          "Keep-alive: %u. Socket alive: %u. Data available: %u. "
5025          "Configuration file change detected: %u. Requests received: %u.",
5026          csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
5027          socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
5028          config_file_change_detected, csp->requests_received_total);
5029 #ifdef FEATURE_HTTPS_INSPECTION
5030       close_client_ssl_connection(csp);
5031 #endif
5032       drain_and_close_socket(csp->cfd);
5033    }
5034
5035    if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5036    {
5037 #ifdef FEATURE_CONNECTION_SHARING
5038       if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5039       {
5040          forget_connection(csp->server_connection.sfd);
5041       }
5042 #endif /* def FEATURE_CONNECTION_SHARING */
5043
5044 #ifdef FEATURE_HTTPS_INSPECTION
5045       close_server_ssl_connection(csp);
5046 #endif /* def FEATURE_HTTPS_INSPECTION */
5047
5048       close_socket(csp->server_connection.sfd);
5049    }
5050
5051 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5052    mark_connection_closed(&csp->server_connection);
5053 #endif
5054
5055    free_csp_resources(csp);
5056
5057    csp->flags &= ~CSP_FLAG_ACTIVE;
5058
5059 }
5060
5061
5062 #ifdef __BEOS__
5063 /*********************************************************************
5064  *
5065  * Function    :  server_thread
5066  *
5067  * Description :  We only exist to call `serve' in a threaded environment.
5068  *
5069  * Parameters  :
5070  *          1  :  data = Current client state (buffers, headers, etc...)
5071  *
5072  * Returns     :  Always 0.
5073  *
5074  *********************************************************************/
5075 static int32 server_thread(void *data)
5076 {
5077    serve((struct client_state *) data);
5078    return 0;
5079
5080 }
5081 #endif
5082
5083
5084 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5085 /*********************************************************************
5086  *
5087  * Function    :  usage
5088  *
5089  * Description :  Print usage info & exit.
5090  *
5091  * Parameters  :  Pointer to argv[0] for identifying ourselves
5092  *
5093  * Returns     :  No. ,-)
5094  *
5095  *********************************************************************/
5096 static void usage(const char *name)
5097 {
5098    printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
5099           "Usage: %s [--config-test] "
5100 #if defined(unix)
5101           "[--chroot] "
5102 #endif /* defined(unix) */
5103           "[--help] "
5104 #if defined(unix)
5105           "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
5106 #endif /* defined(unix) */
5107          "[--version] [configfile]\n",
5108           name);
5109
5110 #ifdef FUZZ
5111    show_fuzz_usage(name);
5112 #endif
5113
5114    printf("Aborting\n");
5115
5116    exit(2);
5117
5118 }
5119 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
5120
5121
5122 #ifdef MUTEX_LOCKS_AVAILABLE
5123 /*********************************************************************
5124  *
5125  * Function    :  privoxy_mutex_lock
5126  *
5127  * Description :  Locks a mutex.
5128  *
5129  * Parameters  :
5130  *          1  :  mutex = The mutex to lock.
5131  *
5132  * Returns     :  Void. May exit in case of errors.
5133  *
5134  *********************************************************************/
5135 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
5136 {
5137 #ifdef FEATURE_PTHREAD
5138    int err = pthread_mutex_lock(mutex);
5139    if (err)
5140    {
5141       if (mutex != &log_mutex)
5142       {
5143          log_error(LOG_LEVEL_FATAL,
5144             "Mutex locking failed: %s.\n", strerror(err));
5145       }
5146       exit(1);
5147    }
5148 #else
5149    EnterCriticalSection(mutex);
5150 #endif /* def FEATURE_PTHREAD */
5151 }
5152
5153
5154 /*********************************************************************
5155  *
5156  * Function    :  privoxy_mutex_unlock
5157  *
5158  * Description :  Unlocks a mutex.
5159  *
5160  * Parameters  :
5161  *          1  :  mutex = The mutex to unlock.
5162  *
5163  * Returns     :  Void. May exit in case of errors.
5164  *
5165  *********************************************************************/
5166 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
5167 {
5168 #ifdef FEATURE_PTHREAD
5169    int err = pthread_mutex_unlock(mutex);
5170    if (err)
5171    {
5172       if (mutex != &log_mutex)
5173       {
5174          log_error(LOG_LEVEL_FATAL,
5175             "Mutex unlocking failed: %s.\n", strerror(err));
5176       }
5177       exit(1);
5178    }
5179 #else
5180    LeaveCriticalSection(mutex);
5181 #endif /* def FEATURE_PTHREAD */
5182 }
5183
5184
5185 /*********************************************************************
5186  *
5187  * Function    :  privoxy_mutex_init
5188  *
5189  * Description :  Prepares a mutex.
5190  *
5191  * Parameters  :
5192  *          1  :  mutex = The mutex to initialize.
5193  *
5194  * Returns     :  Void. May exit in case of errors.
5195  *
5196  *********************************************************************/
5197 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
5198 {
5199 #ifdef FEATURE_PTHREAD
5200    int err = pthread_mutex_init(mutex, 0);
5201    if (err)
5202    {
5203       printf("Fatal error. Mutex initialization failed: %s.\n",
5204          strerror(err));
5205       exit(1);
5206    }
5207 #else
5208    InitializeCriticalSection(mutex);
5209 #endif /* def FEATURE_PTHREAD */
5210 }
5211 #endif /* def MUTEX_LOCKS_AVAILABLE */
5212
5213 /*********************************************************************
5214  *
5215  * Function    :  initialize_mutexes
5216  *
5217  * Description :  Prepares mutexes if mutex support is available.
5218  *
5219  * Parameters  :  None
5220  *
5221  * Returns     :  Void, exits in case of errors.
5222  *
5223  *********************************************************************/
5224 static void initialize_mutexes(void)
5225 {
5226 #ifdef MUTEX_LOCKS_AVAILABLE
5227    /*
5228     * Prepare global mutex semaphores
5229     */
5230
5231 #ifdef FEATURE_HTTPS_INSPECTION
5232    privoxy_mutex_init(&certificate_mutex);
5233    privoxy_mutex_init(&ssl_init_mutex);
5234 #endif
5235
5236    privoxy_mutex_init(&log_mutex);
5237    privoxy_mutex_init(&log_init_mutex);
5238    privoxy_mutex_init(&connection_reuse_mutex);
5239 #ifdef FEATURE_EXTERNAL_FILTERS
5240    privoxy_mutex_init(&external_filter_mutex);
5241 #endif
5242 #ifdef FEATURE_CLIENT_TAGS
5243    privoxy_mutex_init(&client_tags_mutex);
5244 #endif
5245 #ifdef FEATURE_EXTENDED_STATISTICS
5246    privoxy_mutex_init(&filter_statistics_mutex);
5247    privoxy_mutex_init(&block_statistics_mutex);
5248 #endif
5249
5250    /*
5251     * XXX: The assumptions below are a bit naive
5252     * and can cause locks that aren't necessary.
5253     *
5254     * For example older FreeBSD versions (< 6.x?)
5255     * have no gethostbyname_r, but gethostbyname is
5256     * thread safe.
5257     */
5258 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
5259    privoxy_mutex_init(&resolver_mutex);
5260 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
5261    /*
5262     * XXX: should we use a single mutex for
5263     * localtime() and gmtime() as well?
5264     */
5265 #ifndef HAVE_GMTIME_R
5266    privoxy_mutex_init(&gmtime_mutex);
5267 #endif /* ndef HAVE_GMTIME_R */
5268
5269 #ifndef HAVE_LOCALTIME_R
5270    privoxy_mutex_init(&localtime_mutex);
5271 #endif /* ndef HAVE_GMTIME_R */
5272
5273 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
5274    privoxy_mutex_init(&rand_mutex);
5275 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
5276
5277 #endif /* def MUTEX_LOCKS_AVAILABLE */
5278 }
5279
5280 /*********************************************************************
5281  *
5282  * Function    :  main
5283  *
5284  * Description :  Load the config file and start the listen loop.
5285  *                This function is a lot more *sane* with the `load_config'
5286  *                and `listen_loop' functions; although it stills does
5287  *                a *little* too much for my taste.
5288  *
5289  * Parameters  :
5290  *          1  :  argc = Number of parameters (including $0).
5291  *          2  :  argv = Array of (char *)'s to the parameters.
5292  *
5293  * Returns     :  1 if : can't open config file, unrecognized directive,
5294  *                stats requested in multi-thread mode, can't open the
5295  *                log file, can't open the jar file, listen port is invalid,
5296  *                any load fails, and can't bind port.
5297  *
5298  *                Else main never returns, the process must be signaled
5299  *                to terminate execution.  Or, on Windows, use the
5300  *                "File", "Exit" menu option.
5301  *
5302  *********************************************************************/
5303 #ifdef __MINGW32__
5304 int real_main(int argc, char **argv)
5305 #else
5306 int main(int argc, char **argv)
5307 #endif
5308 {
5309    int argc_pos = 0;
5310    int do_config_test = 0;
5311 #ifndef HAVE_ARC4RANDOM
5312    unsigned int random_seed;
5313 #endif
5314 #ifdef unix
5315    struct passwd *pw = NULL;
5316    struct group *grp = NULL;
5317    int do_chroot = 0;
5318    char *pre_chroot_nslookup_to_load_resolver = NULL;
5319 #endif
5320 #ifdef FUZZ
5321    char *fuzz_input_type = NULL;
5322    char *fuzz_input_file = NULL;
5323 #endif
5324
5325    Argc = argc;
5326    Argv = argv;
5327
5328    configfile =
5329 #if !defined(_WIN32)
5330    "config"
5331 #else
5332    "config.txt"
5333 #endif
5334       ;
5335
5336    /* Prepare mutexes if supported and necessary. */
5337    initialize_mutexes();
5338
5339    /* Enable logging until further notice. */
5340    init_log_module();
5341
5342    /*
5343     * Parse the command line arguments
5344     *
5345     * XXX: simply printing usage information in case of
5346     * invalid arguments isn't particularly user friendly.
5347     */
5348    while (++argc_pos < argc)
5349    {
5350 #ifdef _WIN32
5351       /* Check to see if the service must be installed or uninstalled */
5352       if (strncmp(argv[argc_pos], "--install", 9) == 0)
5353       {
5354          const char *pName = argv[argc_pos] + 9;
5355          if (*pName == ':')
5356             pName++;
5357          exit((install_service(pName)) ? 0 : 1);
5358       }
5359       else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
5360       {
5361          const char *pName = argv[argc_pos] + 11;
5362          if (*pName == ':')
5363             pName++;
5364          exit((uninstall_service(pName)) ? 0 : 1);
5365       }
5366       else if (strcmp(argv[argc_pos], "--service") == 0)
5367       {
5368          bRunAsService = TRUE;
5369          w32_set_service_cwd();
5370          atexit(w32_service_exit_notify);
5371       }
5372       else
5373 #endif /* defined(_WIN32) */
5374
5375
5376 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5377
5378       if (strcmp(argv[argc_pos], "--help") == 0)
5379       {
5380          usage(argv[0]);
5381       }
5382
5383       else if (strcmp(argv[argc_pos], "--version") == 0)
5384       {
5385          printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
5386          exit(0);
5387       }
5388
5389 #if defined(unix)
5390
5391       else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
5392       {
5393          set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
5394          daemon_mode = 0;
5395       }
5396
5397       else if (strcmp(argv[argc_pos], "--pidfile") == 0)
5398       {
5399          if (++argc_pos == argc) usage(argv[0]);
5400          pidfile = strdup_or_die(argv[argc_pos]);
5401       }
5402
5403       else if (strcmp(argv[argc_pos], "--user") == 0)
5404       {
5405          char *user_arg;
5406          char *group_name;
5407
5408          if (++argc_pos == argc) usage(argv[argc_pos]);
5409
5410          user_arg = strdup_or_die(argv[argc_pos]);
5411          group_name = strchr(user_arg, '.');
5412          if (NULL != group_name)
5413          {
5414             /* Nul-terminate the user name */
5415             *group_name = '\0';
5416
5417             /* Skip the former delimiter to actually reach the group name */
5418             group_name++;
5419
5420             grp = getgrnam(group_name);
5421             if (NULL == grp)
5422             {
5423                log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
5424             }
5425          }
5426          pw = getpwnam(user_arg);
5427          if (NULL == pw)
5428          {
5429             log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
5430          }
5431
5432          freez(user_arg);
5433       }
5434
5435       else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
5436       {
5437          if (++argc_pos == argc) usage(argv[0]);
5438          pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
5439       }
5440
5441       else if (strcmp(argv[argc_pos], "--chroot") == 0)
5442       {
5443          do_chroot = 1;
5444       }
5445 #endif /* defined(unix) */
5446
5447       else if (strcmp(argv[argc_pos], "--config-test") == 0)
5448       {
5449          do_config_test = 1;
5450       }
5451 #ifdef FUZZ
5452       else if (strcmp(argv[argc_pos], "--fuzz") == 0)
5453       {
5454          argc_pos++;
5455          if (argc < argc_pos + 2) usage(argv[0]);
5456          fuzz_input_type = argv[argc_pos];
5457          argc_pos++;
5458          fuzz_input_file = argv[argc_pos];
5459       }
5460       else if (strcmp(argv[argc_pos], "--stfu") == 0)
5461       {
5462          set_debug_level(LOG_LEVEL_STFU);
5463       }
5464 #endif
5465       else if (argc_pos + 1 != argc)
5466       {
5467          /*
5468           * This is neither the last command line
5469           * option, nor was it recognized before,
5470           * therefore it must be invalid.
5471           */
5472          usage(argv[0]);
5473       }
5474       else
5475
5476 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
5477       {
5478          configfile = argv[argc_pos];
5479       }
5480
5481    } /* -END- while (more arguments) */
5482
5483    show_version(Argv[0]);
5484
5485 #if defined(unix)
5486    if (*configfile != '/')
5487    {
5488       char cwd[BUFFER_SIZE];
5489       char *abs_file;
5490       size_t abs_file_size;
5491
5492       /* make config-filename absolute here */
5493       if (NULL == getcwd(cwd, sizeof(cwd)))
5494       {
5495          perror("failed to get current working directory");
5496          exit(1);
5497       }
5498
5499       basedir = strdup_or_die(cwd);
5500       /* XXX: why + 5? */
5501       abs_file_size = strlen(cwd) + strlen(configfile) + 5;
5502       abs_file = malloc_or_die(abs_file_size);
5503       strlcpy(abs_file, basedir, abs_file_size);
5504       strlcat(abs_file, "/", abs_file_size);
5505       strlcat(abs_file, configfile, abs_file_size);
5506       configfile = abs_file;
5507    }
5508 #endif /* defined unix */
5509
5510
5511    files->next = NULL;
5512    clients->next = NULL;
5513
5514    /* XXX: factor out initialising after the next stable release. */
5515 #ifdef _WIN32
5516    InitWin32();
5517 #endif
5518
5519 #ifndef HAVE_ARC4RANDOM
5520    random_seed = (unsigned int)time(NULL);
5521 #ifdef HAVE_RANDOM
5522    srandom(random_seed);
5523 #else
5524    srand(random_seed);
5525 #endif /* ifdef HAVE_RANDOM */
5526 #endif /* ifndef HAVE_ARC4RANDOM */
5527
5528    /*
5529     * Unix signal handling
5530     *
5531     * Catch the abort, interrupt and terminate signals for a graceful exit
5532     * Catch the hangup signal so the errlog can be reopened.
5533     *
5534     * Ignore the broken pipe signal as connection failures
5535     * are handled when and where they occur without relying
5536     * on a signal.
5537     */
5538 #if !defined(_WIN32)
5539 {
5540    int idx;
5541    const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
5542
5543    for (idx = 0; idx < SZ(catched_signals); idx++)
5544    {
5545 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
5546       if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
5547 #else
5548       if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
5549 #endif /* ifdef sun */
5550       {
5551          log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
5552       }
5553    }
5554
5555    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
5556    {
5557       log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
5558    }
5559
5560 }
5561 #else /* ifdef _WIN32 */
5562 # ifdef _WIN_CONSOLE
5563    /*
5564     * We *are* in a windows console app.
5565     * Print a verbose messages about FAQ's and such
5566     */
5567    printf("%s", win32_blurb);
5568 # endif /* def _WIN_CONSOLE */
5569 #endif /* def _WIN32 */
5570
5571 #ifdef FUZZ
5572    if (fuzz_input_type != NULL)
5573    {
5574       exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
5575    }
5576    log_error(LOG_LEVEL_FATAL,
5577       "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
5578       "Various data structures are static which is unsafe when using threads.");
5579 #endif
5580
5581    if (do_config_test)
5582    {
5583       exit(NULL == load_config());
5584    }
5585
5586    /* Initialize the CGI subsystem */
5587    cgi_init_error_messages();
5588
5589    /*
5590     * If running on unix and without the --no-daemon
5591     * option, become a daemon. I.e. fork, detach
5592     * from tty and get process group leadership
5593     */
5594 #if defined(unix)
5595 {
5596    if (daemon_mode)
5597    {
5598       int fd;
5599       pid_t pid = fork();
5600
5601       if (pid < 0) /* error */
5602       {
5603          perror("fork");
5604          exit(3);
5605       }
5606       else if (pid != 0) /* parent */
5607       {
5608          int status;
5609          pid_t wpid;
5610          /*
5611           * must check for errors
5612           * child died due to missing files aso
5613           */
5614          sleep(1);
5615          wpid = waitpid(pid, &status, WNOHANG);
5616          if (wpid != 0)
5617          {
5618             exit(1);
5619          }
5620          exit(0);
5621       }
5622       /* child */
5623
5624       setsid();
5625
5626       /*
5627        * stderr (fd 2) will be closed later on,
5628        * when the config file has been parsed.
5629        */
5630       close(0);
5631       close(1);
5632
5633       /*
5634        * Reserve fd 0 and 1 to prevent abort() and friends
5635        * from sending stuff to the clients or servers.
5636        */
5637       fd = open("/dev/null", O_RDONLY);
5638       if (fd == -1)
5639       {
5640          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5641       }
5642       else if (fd != 0)
5643       {
5644          if (dup2(fd, 0) == -1)
5645          {
5646             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
5647          }
5648          close(fd);
5649       }
5650       fd = open("/dev/null", O_WRONLY);
5651       if (fd == -1)
5652       {
5653          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5654       }
5655       else if (fd != 1)
5656       {
5657          if (dup2(fd, 1) == -1)
5658          {
5659             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
5660          }
5661          close(fd);
5662       }
5663
5664 #ifdef FEATURE_EXTERNAL_FILTERS
5665       for (fd = 0; fd < 3; fd++)
5666       {
5667          mark_socket_for_close_on_execute(fd);
5668       }
5669 #endif
5670
5671       if (chdir("/") != 0)
5672       {
5673          log_error(LOG_LEVEL_FATAL, "Failed to cd into '/': %E");
5674       }
5675
5676    } /* -END- if (daemon_mode) */
5677
5678    /*
5679     * As soon as we have written the PID file, we can switch
5680     * to the user and group ID indicated by the --user option
5681     */
5682    if (pidfile != NULL)
5683    {
5684       write_pid_file(pidfile);
5685    }
5686    if (NULL != pw)
5687    {
5688       if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
5689       {
5690          log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
5691       }
5692       if (NULL != grp)
5693       {
5694          if (setgroups(1, &grp->gr_gid))
5695          {
5696             log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
5697          }
5698       }
5699       else if (initgroups(pw->pw_name, pw->pw_gid))
5700       {
5701          log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
5702       }
5703       if (do_chroot)
5704       {
5705          if (!pw->pw_dir)
5706          {
5707             log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5708          }
5709          /* Read the time zone file from /etc before doing chroot. */
5710          tzset();
5711          if (NULL != pre_chroot_nslookup_to_load_resolver
5712              && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5713          {
5714             /* Initialize resolver library. */
5715             (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5716          }
5717          if (chroot(pw->pw_dir) < 0)
5718          {
5719             log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5720          }
5721          if (chdir ("/"))
5722          {
5723             log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5724          }
5725       }
5726       if (setuid(pw->pw_uid))
5727       {
5728          log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5729       }
5730       if (do_chroot)
5731       {
5732          char putenv_dummy[64];
5733
5734          strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5735          if (putenv(putenv_dummy) != 0)
5736          {
5737             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5738          }
5739
5740          snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5741          if (putenv(putenv_dummy) != 0)
5742          {
5743             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5744          }
5745       }
5746    }
5747    else if (do_chroot)
5748    {
5749       log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5750    }
5751 }
5752 #endif /* defined unix */
5753
5754 #ifdef _WIN32
5755    /* This will be FALSE unless the command line specified --service
5756     */
5757    if (bRunAsService)
5758    {
5759       /* Yup, so now we must attempt to establish a connection
5760        * with the service dispatcher. This will only work if this
5761        * process was launched by the service control manager to
5762        * actually run as a service. If this isn't the case, i've
5763        * known it take around 30 seconds or so for the call to return.
5764        */
5765
5766       /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5767       if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5768       {
5769          /* Service has run, and at this point is now being stopped, so just return */
5770          return 0;
5771       }
5772
5773 #ifdef _WIN_CONSOLE
5774       printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
5775 #endif
5776       /* An error occurred. Usually it's because --service was wrongly specified
5777        * and we were unable to connect to the Service Control Dispatcher because
5778        * it wasn't expecting us and is therefore not listening.
5779        *
5780        * For now, just continue below to call the listen_loop function.
5781        */
5782    }
5783 #endif /* def _WIN32 */
5784
5785    listen_loop();
5786
5787    /* NOTREACHED */
5788    return(-1);
5789
5790 }
5791
5792
5793 /*********************************************************************
5794  *
5795  * Function    :  bind_port_helper
5796  *
5797  * Description :  Bind the listen port.  Handles logging, and aborts
5798  *                on failure.
5799  *
5800  * Parameters  :
5801  *          1  :  haddr = Host address to bind to. Use NULL to bind to
5802  *                        INADDR_ANY.
5803  *          2  :  hport = Specifies port to bind to.
5804  *          3  :  backlog = Listen backlog.
5805  *
5806  * Returns     :  Port that was opened.
5807  *
5808  *********************************************************************/
5809 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
5810 {
5811    int result;
5812    jb_socket bfd;
5813
5814    result = bind_port(haddr, hport, backlog, &bfd);
5815
5816    if (result < 0)
5817    {
5818       const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
5819       switch(result)
5820       {
5821          case -3:
5822             log_error(LOG_LEVEL_FATAL,
5823                "can't bind to %s:%d: There may be another Privoxy "
5824                "or some other proxy running on port %d",
5825                bind_address, hport, hport);
5826             exit(-1);
5827
5828          case -2:
5829             log_error(LOG_LEVEL_FATAL,
5830                "can't bind to %s:%d: The hostname is not resolvable",
5831                bind_address, hport);
5832             exit(-1);
5833
5834          default:
5835             log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
5836                bind_address, hport);
5837             exit(-1);
5838       }
5839
5840       /* shouldn't get here */
5841       return JB_INVALID_SOCKET;
5842    }
5843
5844 #ifndef HAVE_POLL
5845 #ifndef _WIN32
5846    if (bfd >= FD_SETSIZE)
5847    {
5848       log_error(LOG_LEVEL_FATAL,
5849          "Bind socket number too high to use select(): %d >= %d",
5850          bfd, FD_SETSIZE);
5851    }
5852 #endif
5853 #endif
5854
5855    if (haddr == NULL)
5856    {
5857       log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
5858          hport);
5859    }
5860    else
5861    {
5862       log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
5863          hport, haddr);
5864    }
5865
5866    return bfd;
5867 }
5868
5869
5870 /*********************************************************************
5871  *
5872  * Function    :  bind_ports_helper
5873  *
5874  * Description :  Bind the listen ports.  Handles logging, and aborts
5875  *                on failure.
5876  *
5877  * Parameters  :
5878  *          1  :  config = Privoxy configuration.  Specifies ports
5879  *                         to bind to.
5880  *          2  :  sockets = Preallocated array of opened sockets
5881  *                          corresponding to specification in config.
5882  *                          All non-opened sockets will be set to
5883  *                          JB_INVALID_SOCKET.
5884  *
5885  * Returns     :  Nothing. Inspect sockets argument.
5886  *
5887  *********************************************************************/
5888 static void bind_ports_helper(struct configuration_spec * config,
5889                               jb_socket sockets[])
5890 {
5891    int i;
5892
5893    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5894    {
5895       if (config->hport[i])
5896       {
5897          sockets[i] = bind_port_helper(config->haddr[i],
5898             config->hport[i], config->listen_backlog);
5899 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
5900          if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
5901          {
5902             struct accept_filter_arg af_options;
5903             bzero(&af_options, sizeof(af_options));
5904             strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
5905             if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
5906                   sizeof(af_options)))
5907             {
5908                log_error(LOG_LEVEL_ERROR,
5909                   "Enabling accept filter for socket %d failed: %E", sockets[i]);
5910             }
5911          }
5912 #endif
5913       }
5914       else
5915       {
5916          sockets[i] = JB_INVALID_SOCKET;
5917       }
5918    }
5919    config->need_bind = 0;
5920 }
5921
5922
5923 /*********************************************************************
5924  *
5925  * Function    :  close_ports_helper
5926  *
5927  * Description :  Close listenings ports.
5928  *
5929  * Parameters  :
5930  *          1  :  sockets = Array of opened and non-opened sockets to
5931  *                          close. All sockets will be set to
5932  *                          JB_INVALID_SOCKET.
5933  *
5934  * Returns     :  Nothing.
5935  *
5936  *********************************************************************/
5937 static void close_ports_helper(jb_socket sockets[])
5938 {
5939    int i;
5940
5941    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5942    {
5943       if (JB_INVALID_SOCKET != sockets[i])
5944       {
5945          close_socket(sockets[i]);
5946       }
5947       sockets[i] = JB_INVALID_SOCKET;
5948    }
5949 }
5950
5951
5952 #ifdef _WIN32
5953 /* Without this simple workaround we get this compiler warning from _beginthread
5954  *     warning C4028: formal parameter 1 different from declaration
5955  */
5956 void w32_service_listen_loop(void *p)
5957 {
5958    listen_loop();
5959 }
5960 #endif /* def _WIN32 */
5961
5962
5963 /*********************************************************************
5964  *
5965  * Function    :  listen_loop
5966  *
5967  * Description :  bind the listen port and enter a "FOREVER" listening loop.
5968  *
5969  * Parameters  :  N/A
5970  *
5971  * Returns     :  Never.
5972  *
5973  *********************************************************************/
5974 static void listen_loop(void)
5975 {
5976    struct client_states *csp_list = NULL;
5977    struct client_state *csp = NULL;
5978    jb_socket bfds[MAX_LISTENING_SOCKETS];
5979    struct configuration_spec *config;
5980    unsigned int active_threads = 0;
5981 #if defined(FEATURE_PTHREAD)
5982    pthread_attr_t attrs;
5983
5984    pthread_attr_init(&attrs);
5985    pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
5986 #endif
5987
5988    config = load_config();
5989
5990 #ifdef FEATURE_CONNECTION_SHARING
5991    /*
5992     * XXX: Should be relocated once it no
5993     * longer needs to emit log messages.
5994     */
5995    initialize_reusable_connections();
5996 #endif /* def FEATURE_CONNECTION_SHARING */
5997
5998    bind_ports_helper(config, bfds);
5999
6000 #ifdef FEATURE_GRACEFUL_TERMINATION
6001    while (!g_terminate)
6002 #else
6003    for (;;)
6004 #endif
6005    {
6006 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__)
6007       while (waitpid(-1, NULL, WNOHANG) > 0)
6008       {
6009          /* zombie children */
6010       }
6011 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
6012
6013       /*
6014        * Free data that was used by died threads
6015        */
6016       active_threads = sweep();
6017
6018 #if defined(unix)
6019       /*
6020        * Re-open the errlog after HUP signal
6021        */
6022       if (received_hup_signal)
6023       {
6024          if (NULL != config->logfile)
6025          {
6026             init_error_log(Argv[0], config->logfile);
6027          }
6028          received_hup_signal = 0;
6029       }
6030 #endif
6031
6032       csp_list = zalloc_or_die(sizeof(*csp_list));
6033       csp = &csp_list->csp;
6034
6035       log_error(LOG_LEVEL_CONNECT,
6036          "Waiting for the next client connection. Currently active threads: %u",
6037          active_threads);
6038
6039       /*
6040        * This config may be outdated, but for accept_connection()
6041        * it's fresh enough.
6042        */
6043       csp->config = config;
6044
6045       if (!accept_connection(csp, bfds))
6046       {
6047          log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
6048          freez(csp_list);
6049          continue;
6050       }
6051
6052       csp->flags |= CSP_FLAG_ACTIVE;
6053       csp->server_connection.sfd = JB_INVALID_SOCKET;
6054
6055       csp->config = config = load_config();
6056
6057       if (config->need_bind)
6058       {
6059          /*
6060           * Since we were listening to the "old port", we will not see
6061           * a "listen" param change until the next request.  So, at
6062           * least 1 more request must be made for us to find the new
6063           * setting.  I am simply closing the old socket and binding the
6064           * new one.
6065           *
6066           * Which-ever is correct, we will serve 1 more page via the
6067           * old settings.  This should probably be a "show-status"
6068           * request.  This should not be a so common of an operation
6069           * that this will hurt people's feelings.
6070           */
6071
6072          close_ports_helper(bfds);
6073
6074          bind_ports_helper(config, bfds);
6075       }
6076
6077 #ifdef FEATURE_TOGGLE
6078       if (global_toggle_state)
6079 #endif /* def FEATURE_TOGGLE */
6080       {
6081          csp->flags |= CSP_FLAG_TOGGLED_ON;
6082       }
6083
6084       if (run_loader(csp))
6085       {
6086          log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
6087          /* Never get here - LOG_LEVEL_FATAL causes program exit */
6088       }
6089
6090 #ifdef FEATURE_ACL
6091       if (block_acl(NULL,csp))
6092       {
6093          log_error(LOG_LEVEL_CONNECT,
6094             "Connection from %s on %s (socket %d) dropped due to ACL",
6095             csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
6096          close_socket(csp->cfd);
6097          freez(csp->ip_addr_str);
6098          freez(csp->listen_addr_str);
6099          freez(csp_list);
6100          continue;
6101       }
6102 #endif /* def FEATURE_ACL */
6103
6104       if ((0 != config->max_client_connections)
6105          && (active_threads >= config->max_client_connections))
6106       {
6107          log_error(LOG_LEVEL_ERROR,
6108             "Rejecting connection from %s. Maximum number of connections reached.",
6109             csp->ip_addr_str);
6110          write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6111             strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6112          close_socket(csp->cfd);
6113          freez(csp->ip_addr_str);
6114          freez(csp->listen_addr_str);
6115          freez(csp_list);
6116          continue;
6117       }
6118
6119       /* add it to the list of clients */
6120       csp_list->next = clients->next;
6121       clients->next = csp_list;
6122
6123       if (config->multi_threaded)
6124       {
6125          int child_id;
6126
6127 /* this is a switch () statement in the C preprocessor - ugh */
6128 #undef SELECTED_ONE_OPTION
6129
6130 /* Use Pthreads in preference to native code */
6131 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
6132 #define SELECTED_ONE_OPTION
6133          {
6134             pthread_t the_thread;
6135             int ret;
6136
6137             ret = pthread_create(&the_thread, &attrs,
6138                (void * (*)(void *))serve, csp);
6139             child_id = ret ? -1 : 0;
6140          }
6141 #endif
6142
6143 #if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
6144 #define SELECTED_ONE_OPTION
6145          child_id = _beginthread(
6146             (void (*)(void *))serve,
6147             64 * 1024,
6148             csp);
6149 #endif
6150
6151 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
6152 #define SELECTED_ONE_OPTION
6153          {
6154             thread_id tid = spawn_thread
6155                (server_thread, "server", B_NORMAL_PRIORITY, csp);
6156
6157             if ((tid >= 0) && (resume_thread(tid) == B_OK))
6158             {
6159                child_id = (int) tid;
6160             }
6161             else
6162             {
6163                child_id = -1;
6164             }
6165          }
6166 #endif
6167
6168 #if !defined(SELECTED_ONE_OPTION)
6169          child_id = fork();
6170
6171          /* This block is only needed when using fork().
6172           * When using threads, the server thread was
6173           * created and run by the call to _beginthread().
6174           */
6175          if (child_id == 0)   /* child */
6176          {
6177             int rc = 0;
6178 #ifdef FEATURE_TOGGLE
6179             int inherited_toggle_state = global_toggle_state;
6180 #endif /* def FEATURE_TOGGLE */
6181
6182             serve(csp);
6183
6184             /*
6185              * If we've been toggled or we've blocked the request, tell Mom
6186              */
6187
6188 #ifdef FEATURE_TOGGLE
6189             if (inherited_toggle_state != global_toggle_state)
6190             {
6191                rc |= RC_FLAG_TOGGLED;
6192             }
6193 #endif /* def FEATURE_TOGGLE */
6194
6195 #ifdef FEATURE_STATISTICS
6196             if (csp->flags & CSP_FLAG_REJECTED)
6197             {
6198                rc |= RC_FLAG_BLOCKED;
6199             }
6200 #endif /* ndef FEATURE_STATISTICS */
6201
6202             _exit(rc);
6203          }
6204          else if (child_id > 0) /* parent */
6205          {
6206             /* in a fork()'d environment, the parent's
6207              * copy of the client socket and the CSP
6208              * are not used.
6209              */
6210             int child_status;
6211 #if !defined(_WIN32) && !defined(__CYGWIN__)
6212
6213             wait(&child_status);
6214
6215             /*
6216              * Evaluate child's return code: If the child has
6217              *  - been toggled, toggle ourselves
6218              *  - blocked its request, bump up the stats counter
6219              */
6220
6221 #ifdef FEATURE_TOGGLE
6222             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
6223             {
6224                global_toggle_state = !global_toggle_state;
6225             }
6226 #endif /* def FEATURE_TOGGLE */
6227
6228 #ifdef FEATURE_STATISTICS
6229             urls_read++;
6230             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
6231             {
6232                urls_rejected++;
6233             }
6234 #endif /* def FEATURE_STATISTICS */
6235
6236 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
6237             close_socket(csp->cfd);
6238             csp->flags &= ~CSP_FLAG_ACTIVE;
6239          }
6240 #endif
6241
6242 #undef SELECTED_ONE_OPTION
6243 /* end of cpp switch () */
6244
6245          if (child_id < 0)
6246          {
6247             /*
6248              * Spawning the child failed, assume it's because
6249              * there are too many children running already.
6250              * XXX: If you assume ...
6251              */
6252             log_error(LOG_LEVEL_ERROR,
6253                "Unable to take any additional connections: %E. Active threads: %u",
6254                active_threads);
6255             write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6256                strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6257             close_socket(csp->cfd);
6258             csp->flags &= ~CSP_FLAG_ACTIVE;
6259          }
6260       }
6261       else
6262       {
6263          serve(csp);
6264       }
6265    }
6266
6267 #if defined(FEATURE_PTHREAD)
6268    pthread_attr_destroy(&attrs);
6269 #endif
6270
6271    /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
6272
6273 #ifdef FEATURE_GRACEFUL_TERMINATION
6274
6275    log_error(LOG_LEVEL_INFO, "Graceful termination requested.");
6276
6277    unload_current_config_file();
6278    unload_current_actions_file();
6279    unload_current_re_filterfile();
6280 #ifdef FEATURE_TRUST
6281    unload_current_trust_file();
6282 #endif
6283
6284    if (config->multi_threaded)
6285    {
6286       int i = 60;
6287       do
6288       {
6289          sleep(1);
6290          sweep();
6291       } while ((clients->next != NULL) && (--i > 0));
6292
6293       if (i <= 0)
6294       {
6295          log_error(LOG_LEVEL_ERROR, "Graceful termination failed "
6296             "- still some live clients after 1 minute wait.");
6297       }
6298    }
6299    sweep();
6300    sweep();
6301
6302 #if defined(unix)
6303    freez(basedir);
6304 #endif
6305
6306 #ifdef FEATURE_HTTPS_INSPECTION
6307    /*
6308     * Only release TLS backed resources if there
6309     * are no active connections left.
6310     */
6311    if (clients->next == NULL)
6312    {
6313       ssl_release();
6314    }
6315 #endif
6316
6317    log_error(LOG_LEVEL_INFO, "Exiting gracefully.");
6318
6319 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
6320    /* Cleanup - remove taskbar icon etc. */
6321    TermLogWindow();
6322 #endif
6323
6324    exit(0);
6325 #endif /* FEATURE_GRACEFUL_TERMINATION */
6326
6327 }
6328
6329
6330 /*
6331   Local Variables:
6332   tab-width: 3
6333   end:
6334 */