862c892e01ce242afd48875410ee24a351708d53
[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
2524  *
2525  * Description :  Receives an encrypted request.
2526  *
2527  * Parameters  :
2528  *          1  :  csp = Current client state (buffers, headers, etc...)
2529  *
2530  * Returns     :  JB_ERR_OK on success,
2531  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2532  *
2533  *********************************************************************/
2534 static jb_err receive_encrypted_request(struct client_state *csp)
2535 {
2536    char buf[BUFFER_SIZE];
2537    int len;
2538    char *p;
2539
2540    do
2541    {
2542       log_error(LOG_LEVEL_HEADER, "Reading encrypted headers");
2543       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2544           !data_is_available(csp->cfd, csp->config->socket_timeout))
2545       {
2546          log_error(LOG_LEVEL_CONNECT,
2547             "Socket %d timed out while waiting for client headers", csp->cfd);
2548          return JB_ERR_PARSE;
2549       }
2550       len = ssl_recv_data(&(csp->ssl_client_attr),
2551          (unsigned char *)buf, sizeof(buf));
2552       if (len == 0)
2553       {
2554          log_error(LOG_LEVEL_CONNECT,
2555             "Socket %d closed while waiting for client headers", csp->cfd);
2556          return JB_ERR_PARSE;
2557       }
2558       if (len == -1)
2559       {
2560          return JB_ERR_PARSE;
2561       }
2562       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2563       {
2564          return JB_ERR_MEMORY;
2565       }
2566       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2567    } while (p == NULL);
2568
2569    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2570
2571    return JB_ERR_OK;
2572 }
2573
2574
2575 /*********************************************************************
2576  *
2577  * Function    :  change_encrypted_request_destination
2578  *
2579  * Description :  Parse a (rewritten) request line from an encrypted
2580  *                request and regenerate the http request data.
2581  *
2582  * Parameters  :
2583  *          1  :  csp = Current client state (buffers, headers, etc...)
2584  *
2585  * Returns     :  Forwards the parse_http_request() return code.
2586  *                Terminates in case of memory problems.
2587  *
2588  *********************************************************************/
2589 static jb_err change_encrypted_request_destination(struct client_state *csp)
2590 {
2591    jb_err err;
2592    char *original_host = csp->http->host;
2593    int original_port = csp->http->port;
2594
2595    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2596       csp->https_headers->first->str);
2597    csp->http->host = NULL;
2598    free_http_request(csp->http);
2599    err = parse_http_request(csp->https_headers->first->str, csp->http);
2600    if (JB_ERR_OK != err)
2601    {
2602       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2603          jb_err_to_string(err));
2604       freez(original_host);
2605       return err;
2606    }
2607
2608    if (csp->http->host == NULL)
2609    {
2610       char port_string[10];
2611       /*
2612        * The rewritten request line did not specify a host
2613        * which means we can use the original host specified
2614        * by the client.
2615        */
2616       csp->http->host = original_host;
2617       csp->http->port = original_port;
2618       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2619          csp->http->host);
2620       /*
2621        * If the rewritten request line didn't contain a host
2622        * it also didn't contain a port so we can reuse the host
2623        * port.
2624        */
2625       freez(csp->http->hostport);
2626       csp->http->hostport = strdup_or_die(csp->http->host);
2627       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2628       err = string_append(&csp->http->hostport, port_string);
2629       if (err != JB_ERR_OK)
2630       {
2631          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2632             jb_err_to_string(err));
2633          return err;
2634       }
2635
2636       /*
2637        * While the request line didn't mention it,
2638        * we're https-inspecting and want to speak TLS
2639        * with the server.
2640        */
2641       csp->http->server_ssl = 1;
2642       csp->http->ssl = 1;
2643    }
2644    else
2645    {
2646       /* The rewrite filter added a host so we can ditch the original */
2647       freez(original_host);
2648       csp->http->server_ssl = csp->http->ssl;
2649    }
2650
2651    csp->http->client_ssl = 1;
2652
2653    freez(csp->https_headers->first->str);
2654    build_request_line(csp, NULL, &csp->https_headers->first->str);
2655
2656    if (!server_use_ssl(csp))
2657    {
2658       log_error(LOG_LEVEL_REDIRECTS,
2659          "Rewritten request line results in downgrade to http");
2660       /*
2661        * Replace the unencryptd headers received with the
2662        * CONNECT request with the ones we received securely.
2663        */
2664       destroy_list(csp->headers);
2665       csp->headers->first = csp->https_headers->first;
2666       csp->headers->last  = csp->https_headers->last;
2667       csp->https_headers->first = NULL;
2668       csp->https_headers->last = NULL;
2669    }
2670
2671    return JB_ERR_OK;
2672
2673 }
2674
2675
2676 /*********************************************************************
2677  *
2678  * Function    :  process_encrypted_request
2679  *
2680  * Description :  Receives and parses an encrypted request.
2681  *
2682  * Parameters  :
2683  *          1  :  csp = Current client state (buffers, headers, etc...)
2684  *
2685  * Returns     :  JB_ERR_OK on success,
2686  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2687  *
2688  *********************************************************************/
2689 static jb_err process_encrypted_request(struct client_state *csp)
2690 {
2691    char *p;
2692    char *request_line;
2693    jb_err err;
2694    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2695    struct list header_list;
2696    struct list *headers = &header_list;
2697
2698    assert(csp->ssl_with_client_is_opened);
2699
2700 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2701    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2702    {
2703       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2704    }
2705 #endif
2706    err = receive_encrypted_request(csp);
2707    if (err != JB_ERR_OK)
2708    {
2709       if (csp->client_iob->cur == NULL ||
2710           csp->client_iob->cur == csp->client_iob->eod)
2711       {
2712          /*
2713           * We did not receive any data, most likely because the
2714           * client is done. Don't log this as a parse failure.
2715           */
2716          return JB_ERR_PARSE;
2717       }
2718       /* XXX: Also used for JB_ERR_MEMORY */
2719       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2720          jb_err_to_string(err));
2721       ssl_send_data_delayed(&(csp->ssl_client_attr),
2722          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2723       return err;
2724    }
2725
2726    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2727    request_line = get_header(csp->client_iob);
2728    if (request_line == NULL)
2729    {
2730       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2731       ssl_send_data_delayed(&(csp->ssl_client_attr),
2732          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2733       return JB_ERR_PARSE;
2734    }
2735    assert(*request_line != '\0');
2736
2737    if (client_protocol_is_unsupported(csp, request_line))
2738    {
2739       /*
2740        * If the protocol is unsupported we're done here.
2741        * client_protocol_is_unsupported() took care of sending
2742        * the error response and logging the error message.
2743        */
2744       return JB_ERR_PARSE;
2745    }
2746
2747 #ifdef FEATURE_FORCE_LOAD
2748    if (force_required(csp, request_line))
2749    {
2750       csp->flags |= CSP_FLAG_FORCED;
2751    }
2752 #endif /* def FEATURE_FORCE_LOAD */
2753
2754    free_http_request(csp->http);
2755
2756    err = parse_http_request(request_line, csp->http);
2757    /* XXX: Restore ssl setting. This is ugly */
2758    csp->http->client_ssl = 1;
2759    csp->http->server_ssl = 1;
2760
2761    freez(request_line);
2762    if (JB_ERR_OK != err)
2763    {
2764       ssl_send_data_delayed(&(csp->ssl_client_attr),
2765          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2766       /* XXX: Use correct size */
2767       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2768       log_error(LOG_LEVEL_ERROR,
2769          "Couldn't parse request line received from %s: %s",
2770          csp->ip_addr_str, jb_err_to_string(err));
2771
2772       free_http_request(csp->http);
2773       return JB_ERR_PARSE;
2774    }
2775
2776    /* Parse the rest of the client's headers. */
2777    init_list(headers);
2778    for (;;)
2779    {
2780       p = get_header(csp->client_iob);
2781
2782       if (p == NULL)
2783       {
2784          /* There are no additional headers to read. */
2785          break;
2786       }
2787       enlist(headers, p);
2788       freez(p);
2789    }
2790
2791    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2792    {
2793       /*
2794        * Our attempts to get the request destination
2795        * elsewhere failed.
2796        */
2797       log_error(LOG_LEVEL_ERROR,
2798          "Failed to get the encrypted request destination");
2799       ssl_send_data_delayed(&(csp->ssl_client_attr),
2800          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2801       return JB_ERR_PARSE;
2802    }
2803
2804    /* Split the domain we just got for pattern matching */
2805    init_domain_components(csp->http);
2806
2807 #ifdef FEATURE_CLIENT_TAGS
2808    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2809    if (csp->client_address == NULL)
2810    {
2811       set_client_address(csp, headers);
2812       get_tag_list_for_client(csp->client_tags, csp->client_address);
2813    }
2814 #endif
2815
2816 #ifdef FEATURE_TOGGLE
2817    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2818 #endif
2819    {
2820       /*
2821        * Determine the actions for this request after
2822        * clearing the ones from the previous one.
2823        */
2824       free_current_action(csp->action);
2825       get_url_actions(csp, csp->http);
2826    }
2827
2828    enlist(csp->https_headers, csp->http->cmd);
2829
2830    /* Append the previously read headers */
2831    err = list_append_list_unique(csp->https_headers, headers);
2832    destroy_list(headers);
2833    if (JB_ERR_OK != err)
2834    {
2835       /* XXX: Send error message */
2836       return err;
2837    }
2838
2839    /* XXX: Work around crash */
2840    csp->error_message = NULL;
2841
2842    /* XXX: Why do this here? */
2843    csp->http->ssl = 1;
2844
2845    err = sed_https(csp);
2846    if (JB_ERR_OK != err)
2847    {
2848       ssl_send_data_delayed(&(csp->ssl_client_attr),
2849          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2850       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2851          csp->ip_addr_str);
2852       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2853          csp->ip_addr_str, csp->http->cmd);
2854       return JB_ERR_PARSE;
2855    }
2856
2857    if ((NULL == csp->https_headers->first->str)
2858       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2859          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2860    {
2861       ssl_send_data_delayed(&(csp->ssl_client_attr),
2862          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2863          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2864       log_error(LOG_LEVEL_ERROR,
2865          "Invalid request line after applying header filters.");
2866       /* XXX: Use correct size */
2867       log_error(LOG_LEVEL_CLF,
2868          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2869
2870       return JB_ERR_PARSE;
2871    }
2872
2873    log_error(LOG_LEVEL_HEADER, "Encrypted request processed");
2874    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2875       csp->http->path);
2876
2877    return err;
2878
2879 }
2880
2881 /*********************************************************************
2882  *
2883  * Function    :  cgi_page_requested
2884  *
2885  * Description :  Checks if a request is for an internal CGI page.
2886  *
2887  * Parameters  :
2888  *          1  :  host = The host requested by the client.
2889  *
2890  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2891  *
2892  *********************************************************************/
2893 static int cgi_page_requested(const char *host)
2894 {
2895    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2896     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2897     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2898     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2899    {
2900       return 1;
2901    }
2902
2903    return 0;
2904
2905 }
2906
2907
2908 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2909 /*********************************************************************
2910  *
2911  * Function    :  continue_https_chat
2912  *
2913  * Description :  Behaves similar to chat() but only deals with
2914  *                https-inspected requests that arrive on an already
2915  *                established connection. The first request is always
2916  *                served by chat() which is a lot more complex as it
2917  *                has to deal with forwarding settings and connection
2918  *                failures etc.
2919  *
2920  *                If a connection to the server has already been
2921  *                opened it is reused unless the request is blocked
2922  *                or the forwarder changed.
2923  *
2924  *                If a connection to the server has not yet been
2925  *                opened (because the previous request was crunched),
2926  *                or the forwarder changed, the connection is dropped
2927  *                so that the client retries on a fresh one.
2928  *
2929  * Parameters  :
2930  *          1  :  csp = Current client state (buffers, headers, etc...)
2931  *
2932  * Returns     :  Nothing.
2933  *
2934  *********************************************************************/
2935 static void continue_https_chat(struct client_state *csp)
2936 {
2937    const struct forward_spec *fwd;
2938
2939    if (JB_ERR_OK != process_encrypted_request(csp))
2940    {
2941       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2942       return;
2943    }
2944
2945    csp->requests_received_total++;
2946
2947    /*
2948     * We have an encrypted request. Check if one of the crunchers wants it.
2949     */
2950    if (crunch_response_triggered(csp, crunchers_all))
2951    {
2952       /*
2953        * Yes. The client got the crunch response and we're done here.
2954        */
2955       return;
2956    }
2957    if (csp->ssl_with_server_is_opened == 0)
2958    {
2959       log_error(LOG_LEVEL_CONNECT,
2960          "Dropping the client connection on socket %d. "
2961          "The server connection has not been established yet.",
2962          csp->cfd);
2963       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2964       return;
2965    }
2966    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
2967
2968    fwd = forward_url(csp, csp->http);
2969    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
2970    {
2971       log_error(LOG_LEVEL_CONNECT,
2972          "Dropping the client connection on socket %d with "
2973          "server socket %d connected to %s. The forwarder has changed.",
2974          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
2975       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2976       return;
2977    }
2978
2979    log_applied_actions(csp->action);
2980
2981    log_error(LOG_LEVEL_CONNECT,
2982       "Reusing server socket %d connected to %s. Requests already sent: %u.",
2983       csp->server_connection.sfd, csp->server_connection.host,
2984       csp->server_connection.requests_sent_total);
2985
2986    if (send_https_request(csp))
2987    {
2988       /*
2989        * Most likely the server connection timed out. We can't easily
2990        * create a new one so simply drop the client connection without a
2991        * error response to let the client retry.
2992        */
2993       log_error(LOG_LEVEL_CONNECT,
2994          "Dropping client connection on socket %d. "
2995          "Forwarding the encrypted client request failed.",
2996          csp->cfd);
2997       return;
2998    }
2999    csp->server_connection.request_sent = time(NULL);
3000    csp->server_connection.requests_sent_total++;
3001    handle_established_connection(csp);
3002    freez(csp->receive_buffer);
3003 }
3004 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3005 #endif
3006
3007
3008 /*********************************************************************
3009  *
3010  * Function    :  handle_established_connection
3011  *
3012  * Description :  Shuffle data between client and server once the
3013  *                connection has been established and the request
3014  *                has been sent.
3015  *
3016  * Parameters  :
3017  *          1  :  csp = Current client state (buffers, headers, etc...)
3018  *
3019  * Returns     :  Nothing.
3020  *
3021  *********************************************************************/
3022 static void handle_established_connection(struct client_state *csp)
3023 {
3024    char *hdr;
3025    char *p;
3026    int n;
3027 #ifdef HAVE_POLL
3028    struct pollfd poll_fds[2];
3029 #else
3030    fd_set rfds;
3031    jb_socket maxfd;
3032    struct timeval timeout;
3033 #endif
3034    int server_body;
3035    int ms_iis5_hack = 0;
3036    unsigned long long byte_count = 0;
3037    struct http_request *http;
3038    long len = 0; /* for buffer sizes (and negative error codes) */
3039    int buffer_and_filter_content = 0;
3040    unsigned int write_delay;
3041 #ifdef FEATURE_HTTPS_INSPECTION
3042    int ret = 0;
3043    int use_ssl_tunnel = 0;
3044    csp->dont_verify_certificate = 0;
3045
3046    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3047    {
3048       /* Pass encrypted content without filtering. */
3049       use_ssl_tunnel = 1;
3050    }
3051 #endif
3052
3053    /* Skeleton for HTTP response, if we should intercept the request */
3054    struct http_response *rsp;
3055 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3056    int watch_client_socket;
3057 #endif
3058
3059    csp->receive_buffer_size = csp->config->receive_buffer_size;
3060    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3061    if (csp->receive_buffer == NULL)
3062    {
3063       log_error(LOG_LEVEL_ERROR,
3064          "Out of memory. Failed to allocate the receive buffer.");
3065       rsp = cgi_error_memory();
3066       send_crunch_response(csp, rsp);
3067       return;
3068    }
3069
3070    http = csp->http;
3071
3072 #ifndef HAVE_POLL
3073    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3074       csp->cfd : csp->server_connection.sfd;
3075 #endif
3076
3077    /* pass data between the client and server
3078     * until one or the other shuts down the connection.
3079     */
3080
3081    server_body = 0;
3082
3083 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3084    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3085 #endif
3086    write_delay = get_write_delay(csp);
3087
3088    for (;;)
3089    {
3090 #ifdef FEATURE_HTTPS_INSPECTION
3091       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3092       {
3093          /*
3094           * It's possible that the TLS library already consumed all the
3095           * data the server intends to send. If that happens poll() and
3096           * select() will no longer see the data as available so we have
3097           * to skip the calls.
3098           */
3099          goto server_wants_to_talk;
3100       }
3101 #endif
3102 #ifndef HAVE_POLL
3103       FD_ZERO(&rfds);
3104 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3105       if (!watch_client_socket)
3106       {
3107          maxfd = csp->server_connection.sfd;
3108       }
3109       else
3110 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3111       {
3112          FD_SET(csp->cfd, &rfds);
3113       }
3114
3115       FD_SET(csp->server_connection.sfd, &rfds);
3116 #endif /* ndef HAVE_POLL */
3117
3118 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3119       if ((csp->flags & CSP_FLAG_CHUNKED)
3120          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3121          && ((csp->iob->eod - csp->iob->cur) >= 5)
3122          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3123       {
3124          /*
3125           * XXX: This check should be obsolete now,
3126           *      but let's wait a while to be sure.
3127           */
3128          log_error(LOG_LEVEL_CONNECT,
3129             "Looks like we got the last chunk together with "
3130             "the server headers but didn't detect it earlier. "
3131             "We better stop reading.");
3132          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3133          csp->expected_content_length = byte_count;
3134          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3135       }
3136       if (server_body && server_response_is_complete(csp, byte_count))
3137       {
3138          if (csp->expected_content_length == byte_count)
3139          {
3140             log_error(LOG_LEVEL_CONNECT,
3141                "Done reading from server. Content length: %llu as expected. "
3142                "Bytes most recently read: %ld.",
3143                byte_count, len);
3144          }
3145          else
3146          {
3147             log_error(LOG_LEVEL_CONNECT,
3148                "Done reading from server. Expected content length: %llu. "
3149                "Actual content length: %llu. Bytes most recently read: %ld.",
3150                csp->expected_content_length, byte_count, len);
3151          }
3152          len = 0;
3153          /*
3154           * XXX: Should not jump around, handle_established_connection()
3155           * is complicated enough already.
3156           */
3157          goto reading_done;
3158       }
3159 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3160
3161 #ifdef HAVE_POLL
3162       poll_fds[0].fd = csp->cfd;
3163 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3164       if (!watch_client_socket)
3165       {
3166          /*
3167           * Ignore incoming data, but still watch out
3168           * for disconnects etc. These flags are always
3169           * implied anyway but explicitly setting them
3170           * doesn't hurt.
3171           */
3172          poll_fds[0].events = POLLERR|POLLHUP;
3173       }
3174       else
3175 #endif
3176       {
3177          poll_fds[0].events = POLLIN;
3178       }
3179       poll_fds[1].fd = csp->server_connection.sfd;
3180       poll_fds[1].events = POLLIN;
3181       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3182 #else
3183       timeout.tv_sec = csp->config->socket_timeout;
3184       timeout.tv_usec = 0;
3185       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3186 #endif /* def HAVE_POLL */
3187
3188       /* Server or client not responding in timeout */
3189       if (n == 0)
3190       {
3191          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3192             csp->config->socket_timeout, http->url);
3193          if ((byte_count == 0) && (http->ssl == 0))
3194          {
3195             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3196          }
3197          mark_server_socket_tainted(csp);
3198 #ifdef FEATURE_HTTPS_INSPECTION
3199          close_client_and_server_ssl_connections(csp);
3200 #endif
3201          return;
3202       }
3203       else if (n < 0)
3204       {
3205 #ifdef HAVE_POLL
3206          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3207 #else
3208          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3209 #endif
3210          mark_server_socket_tainted(csp);
3211 #ifdef FEATURE_HTTPS_INSPECTION
3212          close_client_and_server_ssl_connections(csp);
3213 #endif
3214          return;
3215       }
3216
3217       /*
3218        * This is the body of the browser's request,
3219        * just read and write it.
3220        *
3221        * Receives data from browser and sends it to server
3222        *
3223        * XXX: Make sure the client doesn't use pipelining
3224        * behind Privoxy's back.
3225        */
3226 #ifdef HAVE_POLL
3227       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3228       {
3229          log_error(LOG_LEVEL_CONNECT,
3230             "The client socket %d has become unusable while "
3231             "the server socket %d is still open.",
3232             csp->cfd, csp->server_connection.sfd);
3233          mark_server_socket_tainted(csp);
3234          break;
3235       }
3236
3237       if (poll_fds[0].revents != 0)
3238 #else
3239       if (FD_ISSET(csp->cfd, &rfds))
3240 #endif /* def HAVE_POLL*/
3241       {
3242          int max_bytes_to_read = (int)csp->receive_buffer_size;
3243
3244 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3245          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3246          {
3247             if (data_is_available(csp->cfd, 0))
3248             {
3249                /*
3250                 * If the next request is already waiting, we have
3251                 * to stop select()ing the client socket. Otherwise
3252                 * we would always return right away and get nothing
3253                 * else done.
3254                 */
3255                watch_client_socket = 0;
3256                log_error(LOG_LEVEL_CONNECT,
3257                   "Stop watching client socket %d. "
3258                   "There's already another request waiting.",
3259                   csp->cfd);
3260                continue;
3261             }
3262             /*
3263              * If the client socket is set, but there's no data
3264              * available on the socket, the client went fishing
3265              * and continuing talking to the server makes no sense.
3266              */
3267             log_error(LOG_LEVEL_CONNECT,
3268                "The client closed socket %d while "
3269                "the server socket %d is still open.",
3270                csp->cfd, csp->server_connection.sfd);
3271             mark_server_socket_tainted(csp);
3272             break;
3273          }
3274          if (csp->expected_client_content_length != 0)
3275          {
3276             if (csp->expected_client_content_length < csp->receive_buffer_size)
3277             {
3278                max_bytes_to_read = (int)csp->expected_client_content_length;
3279             }
3280             log_error(LOG_LEVEL_CONNECT,
3281                "Waiting for up to %d bytes from the client.",
3282                max_bytes_to_read);
3283          }
3284          assert(max_bytes_to_read <= csp->receive_buffer_size);
3285 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3286
3287 #ifdef FEATURE_HTTPS_INSPECTION
3288          if (client_use_ssl(csp))
3289          {
3290             if (csp->http->status == 101)
3291             {
3292                len = ssl_recv_data(&(csp->ssl_client_attr),
3293                   (unsigned char *)csp->receive_buffer,
3294                   (size_t)max_bytes_to_read);
3295                if (len == -1)
3296                {
3297                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3298                      "on client socket %d for an upgraded connection",
3299                      csp->cfd);
3300                   break;
3301                }
3302                if (len == 0)
3303                {
3304                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3305                      "on client socket %d for an upgraded connection",
3306                      csp->cfd);
3307                   break;
3308                }
3309                byte_count += (unsigned long long)len;
3310                len = ssl_send_data(&(csp->ssl_server_attr),
3311                   (unsigned char *)csp->receive_buffer, (size_t)len);
3312                if (len == -1)
3313                {
3314                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3315                      "on server socket %d for an upgraded connection",
3316                      csp->server_connection.sfd);
3317                   break;
3318                }
3319                continue;
3320             }
3321             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3322             break;
3323          }
3324          else
3325 #endif /* def FEATURE_HTTPS_INSPECTION */
3326          {
3327             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3328
3329             if (len <= 0)
3330             {
3331                /* XXX: not sure if this is necessary. */
3332                mark_server_socket_tainted(csp);
3333                break; /* "game over, man" */
3334             }
3335
3336 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3337             if (csp->expected_client_content_length != 0)
3338             {
3339                assert(len <= max_bytes_to_read);
3340                csp->expected_client_content_length -= (unsigned)len;
3341                log_error(LOG_LEVEL_CONNECT,
3342                   "Expected client content length set to %llu "
3343                   "after reading %ld bytes.",
3344                   csp->expected_client_content_length, len);
3345                if (csp->expected_client_content_length == 0)
3346                {
3347                   log_error(LOG_LEVEL_CONNECT,
3348                      "Done reading from the client.");
3349                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3350                }
3351             }
3352 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3353
3354             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3355             {
3356                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3357                mark_server_socket_tainted(csp);
3358                return;
3359             }
3360          }
3361          continue;
3362       }
3363
3364       /*
3365        * The server wants to talk. It could be the header or the body.
3366        * If `hdr' is null, then it's the header otherwise it's the body.
3367        * FIXME: Does `hdr' really mean `host'? No.
3368        */
3369 #ifdef HAVE_POLL
3370       if (poll_fds[1].revents != 0)
3371 #else
3372       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3373 #endif /* HAVE_POLL */
3374       {
3375 #ifdef FEATURE_HTTPS_INSPECTION
3376          server_wants_to_talk:
3377 #endif
3378 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3379          /*
3380           * If we are buffering content, we don't want to eat up to
3381           * buffer-limit bytes if the client no longer cares about them.
3382           * If we aren't buffering, however, a dead client socket will be
3383           * noticed pretty much right away anyway, so we can reduce the
3384           * overhead by skipping the check.
3385           */
3386          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3387          {
3388 #ifdef _WIN32
3389             log_error(LOG_LEVEL_CONNECT,
3390                "The server still wants to talk, but the client may already have hung up on us.");
3391 #else
3392             log_error(LOG_LEVEL_CONNECT,
3393                "The server still wants to talk, but the client hung up on us.");
3394             mark_server_socket_tainted(csp);
3395 #ifdef FEATURE_HTTPS_INSPECTION
3396             close_client_and_server_ssl_connections(csp);
3397 #endif
3398             return;
3399 #endif /* def _WIN32 */
3400          }
3401 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3402
3403 #ifdef FEATURE_HTTPS_INSPECTION
3404          /*
3405           * Reading data from standard or secured connection (HTTP/HTTPS)
3406           */
3407          if (server_use_ssl(csp))
3408          {
3409             len = ssl_recv_data(&(csp->ssl_server_attr),
3410                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3411          }
3412          else
3413 #endif
3414          {
3415             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3416                (int)csp->receive_buffer_size);
3417          }
3418
3419          if (len < 0)
3420          {
3421             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3422
3423             if ((http->ssl && (csp->fwd == NULL))
3424 #ifdef FEATURE_HTTPS_INSPECTION
3425                && use_ssl_tunnel
3426 #endif
3427                 )
3428             {
3429                /*
3430                 * Just hang up. We already confirmed the client's CONNECT
3431                 * request with status code 200 and unencrypted content is
3432                 * no longer welcome.
3433                 */
3434                log_error(LOG_LEVEL_ERROR,
3435                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3436                return;
3437             }
3438             else if (byte_count)
3439             {
3440                /*
3441                 * Just hang up. We already transmitted the original headers
3442                 * and parts of the original content and therefore missed the
3443                 * chance to send an error message (without risking data corruption).
3444                 *
3445                 * XXX: we could retry with a fancy range request here.
3446                 */
3447                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3448                   "Unable to tell the client about the problem.");
3449                mark_server_socket_tainted(csp);
3450 #ifdef FEATURE_HTTPS_INSPECTION
3451                close_client_and_server_ssl_connections(csp);
3452 #endif
3453                return;
3454             }
3455             /*
3456              * XXX: Consider handling the cases above the same.
3457              */
3458             mark_server_socket_tainted(csp);
3459             len = 0;
3460          }
3461
3462 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3463          if (csp->flags & CSP_FLAG_CHUNKED)
3464          {
3465             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3466             {
3467                /* XXX: this is a temporary hack */
3468                log_error(LOG_LEVEL_CONNECT,
3469                   "Looks like we reached the end of the last chunk. "
3470                   "We better stop reading.");
3471                csp->expected_content_length = byte_count + (unsigned long long)len;
3472                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3473             }
3474          }
3475          reading_done:
3476 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3477
3478          /*
3479           * This is guaranteed by allocating with zalloc_or_die()
3480           * and never (intentionally) writing to the last byte.
3481           *
3482           * csp->receive_buffer_size is the size of the part of the
3483           * buffer we intentionally write to, but we actually
3484           * allocated csp->receive_buffer_size+1 bytes so the assertion
3485           * stays within the allocated range.
3486           */
3487          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3488
3489          /*
3490           * Add a trailing zero to let be able to use string operations.
3491           * XXX: do we still need this with filter_popups gone?
3492           */
3493          assert(len <= csp->receive_buffer_size);
3494          csp->receive_buffer[len] = '\0';
3495
3496          /*
3497           * Normally, this would indicate that we've read
3498           * as much as the server has sent us and we can
3499           * close the client connection.  However, Microsoft
3500           * in its wisdom has released IIS/5 with a bug that
3501           * prevents it from sending the trailing \r\n in
3502           * a 302 redirect header (and possibly other headers).
3503           * To work around this if we've haven't parsed
3504           * a full header we'll append a trailing \r\n
3505           * and see if this now generates a valid one.
3506           *
3507           * This hack shouldn't have any impacts.  If we've
3508           * already transmitted the header or if this is a
3509           * SSL connection, then we won't bother with this
3510           * hack.  So we only work on partially received
3511           * headers.  If we append a \r\n and this still
3512           * doesn't generate a valid header, then we won't
3513           * transmit anything to the client.
3514           */
3515          if (len == 0)
3516          {
3517
3518             if (server_body || (http->ssl
3519 #ifdef FEATURE_HTTPS_INSPECTION
3520                   && use_ssl_tunnel
3521 #endif
3522                ))
3523             {
3524                /*
3525                 * If we have been buffering up the document,
3526                 * now is the time to apply content modification
3527                 * and send the result to the client.
3528                 */
3529                if (buffer_and_filter_content)
3530                {
3531                   p = execute_content_filters(csp);
3532                   /*
3533                    * If content filtering fails, use the original
3534                    * buffer and length.
3535                    * (see p != NULL ? p : csp->iob->cur below)
3536                    */
3537                   if (NULL == p)
3538                   {
3539                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3540                   }
3541 #ifdef FEATURE_COMPRESSION
3542                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3543                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3544                   {
3545                      char *compressed_content = compress_buffer(p,
3546                         (size_t *)&csp->content_length, csp->config->compression_level);
3547                      if (compressed_content != NULL)
3548                      {
3549                         freez(p);
3550                         p = compressed_content;
3551                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3552                      }
3553                   }
3554 #endif
3555
3556                   if (JB_ERR_OK != update_server_headers(csp))
3557                   {
3558                      log_error(LOG_LEVEL_FATAL,
3559                         "Failed to update server headers. after filtering.");
3560                   }
3561
3562                   hdr = list_to_text(csp->headers);
3563                   if (hdr == NULL)
3564                   {
3565                      /* FIXME Should handle error properly */
3566                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3567                   }
3568
3569 #ifdef FEATURE_HTTPS_INSPECTION
3570                   /*
3571                    * Sending data with standard or secured connection (HTTP/HTTPS)
3572                    */
3573                   if (client_use_ssl(csp))
3574                   {
3575                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3576                               (const unsigned char *)hdr, strlen(hdr),
3577                               get_write_delay(csp)) < 0)
3578                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3579                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3580                               csp->content_length, get_write_delay(csp)) < 0))
3581                      {
3582                         log_error(LOG_LEVEL_ERROR,
3583                            "Failed to send the modified content to the client over TLS");
3584                         freez(hdr);
3585                         freez(p);
3586                         mark_server_socket_tainted(csp);
3587                         close_client_and_server_ssl_connections(csp);
3588                         return;
3589                      }
3590                   }
3591                   else
3592 #endif /* def FEATURE_HTTPS_INSPECTION */
3593                   {
3594                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3595                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3596                          (size_t)csp->content_length, write_delay))
3597                      {
3598                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3599                         freez(hdr);
3600                         freez(p);
3601                         mark_server_socket_tainted(csp);
3602                         return;
3603                      }
3604                   }
3605
3606                   freez(hdr);
3607                   freez(p);
3608                }
3609
3610                break; /* "game over, man" */
3611             }
3612
3613             /*
3614              * This is not the body, so let's pretend the server just sent
3615              * us a blank line.
3616              */
3617             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3618             len = (int)strlen(csp->receive_buffer);
3619
3620             /*
3621              * Now, let the normal header parsing algorithm below do its
3622              * job.  If it fails, we'll exit instead of continuing.
3623              */
3624
3625             ms_iis5_hack = 1;
3626          }
3627
3628          /*
3629           * If we're in the body of the server document, just write it to
3630           * the client, unless we need to buffer the body for later
3631           * content-filtering.
3632           */
3633          if (server_body || (http->ssl
3634 #ifdef FEATURE_HTTPS_INSPECTION
3635                && use_ssl_tunnel
3636 #endif
3637             ))
3638          {
3639             if (buffer_and_filter_content)
3640             {
3641                /*
3642                 * If there is no memory left for buffering the content, or the buffer limit
3643                 * has been reached, switch to non-filtering mode, i.e. make & write the
3644                 * header, flush the iob and buf, and get out of the way.
3645                 */
3646                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3647                {
3648                   size_t hdrlen;
3649                   long flushed;
3650
3651                   log_error(LOG_LEVEL_INFO,
3652                      "Flushing header and buffers. Stepping back from filtering.");
3653
3654                   hdr = list_to_text(csp->headers);
3655                   if (hdr == NULL)
3656                   {
3657                      /*
3658                       * Memory is too tight to even generate the header.
3659                       * Send our static "Out-of-memory" page.
3660                       */
3661                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3662                      rsp = cgi_error_memory();
3663                      send_crunch_response(csp, rsp);
3664                      mark_server_socket_tainted(csp);
3665 #ifdef FEATURE_HTTPS_INSPECTION
3666                      close_client_and_server_ssl_connections(csp);
3667 #endif
3668                      return;
3669                   }
3670                   hdrlen = strlen(hdr);
3671
3672 #ifdef FEATURE_HTTPS_INSPECTION
3673                   /*
3674                    * Sending data with standard or secured connection (HTTP/HTTPS)
3675                    */
3676                   if (client_use_ssl(csp))
3677                   {
3678                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3679                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3680                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3681                                 csp->iob)) < 0)
3682                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3683                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3684                               get_write_delay(csp)) < 0))
3685                      {
3686                         log_error(LOG_LEVEL_CONNECT,
3687                            "Flush header and buffers to client failed");
3688                         freez(hdr);
3689                         mark_server_socket_tainted(csp);
3690                         close_client_and_server_ssl_connections(csp);
3691                         return;
3692                      }
3693                   }
3694                   else
3695 #endif /* def FEATURE_HTTPS_INSPECTION */
3696                   {
3697                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3698                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3699                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3700                             write_delay))
3701                      {
3702                         log_error(LOG_LEVEL_CONNECT,
3703                            "Flush header and buffers to client failed: %E");
3704                         freez(hdr);
3705                         mark_server_socket_tainted(csp);
3706                         return;
3707                      }
3708                   }
3709
3710                   /*
3711                    * Reset the byte_count to the amount of bytes
3712                    * we just flushed. len will be added a few lines below,
3713                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3714                    */
3715                   byte_count = (unsigned long long)flushed;
3716                   freez(hdr);
3717                   buffer_and_filter_content = 0;
3718                   server_body = 1;
3719                }
3720             }
3721             else
3722             {
3723 #ifdef FEATURE_HTTPS_INSPECTION
3724                /*
3725                 * Sending data with standard or secured connection (HTTP/HTTPS)
3726                 */
3727                if (client_use_ssl(csp))
3728                {
3729                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3730                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3731                      get_write_delay(csp));
3732                   if (ret < 0)
3733                   {
3734                      log_error(LOG_LEVEL_ERROR,
3735                         "Sending data to client failed");
3736                      mark_server_socket_tainted(csp);
3737                      close_client_and_server_ssl_connections(csp);
3738                      return;
3739                   }
3740                }
3741                else
3742 #endif /* def FEATURE_HTTPS_INSPECTION */
3743                {
3744                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3745                         (size_t)len, write_delay))
3746                   {
3747                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3748                      mark_server_socket_tainted(csp);
3749                      return;
3750                   }
3751                }
3752             }
3753             byte_count += (unsigned long long)len;
3754             continue;
3755          }
3756          else
3757          {
3758             /*
3759              * We're still looking for the end of the server's header.
3760              * Buffer up the data we just read.  If that fails, there's
3761              * little we can do but send our static out-of-memory page.
3762              */
3763             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3764             {
3765                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3766                rsp = cgi_error_memory();
3767                send_crunch_response(csp, rsp);
3768                mark_server_socket_tainted(csp);
3769 #ifdef FEATURE_HTTPS_INSPECTION
3770                close_client_and_server_ssl_connections(csp);
3771 #endif
3772                return;
3773             }
3774
3775             /* Convert iob into something sed() can digest */
3776             if (JB_ERR_PARSE == get_server_headers(csp))
3777             {
3778                if (ms_iis5_hack)
3779                {
3780                   /*
3781                    * Well, we tried our MS IIS/5 hack and it didn't work.
3782                    * The header is incomplete and there isn't anything
3783                    * we can do about it.
3784                    */
3785                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3786                      "Applying the MS IIS5 hack didn't help.");
3787                   log_error(LOG_LEVEL_CLF,
3788                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3789 #ifdef FEATURE_HTTPS_INSPECTION
3790                   /*
3791                    * Sending data with standard or secured connection (HTTP/HTTPS)
3792                    */
3793                   if (client_use_ssl(csp))
3794                   {
3795                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3796                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3797                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3798                   }
3799                   else
3800 #endif /* def FEATURE_HTTPS_INSPECTION */
3801                   {
3802                      write_socket_delayed(csp->cfd,
3803                         INVALID_SERVER_HEADERS_RESPONSE,
3804                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3805                   }
3806                   mark_server_socket_tainted(csp);
3807 #ifdef FEATURE_HTTPS_INSPECTION
3808                   close_client_and_server_ssl_connections(csp);
3809 #endif
3810                   return;
3811                }
3812                else
3813                {
3814                   /*
3815                    * Since we have to wait for more from the server before
3816                    * we can parse the headers we just continue here.
3817                    */
3818                   log_error(LOG_LEVEL_CONNECT,
3819                      "Continuing buffering server headers from socket %d. "
3820                      "Bytes most recently read: %ld.", csp->cfd, len);
3821                   continue;
3822                }
3823             }
3824             else
3825             {
3826                /*
3827                 * Account for the content bytes we
3828                 * might have gotten with the headers.
3829                 */
3830                assert(csp->iob->eod >= csp->iob->cur);
3831                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3832             }
3833
3834             /* Did we actually get anything? */
3835             if (NULL == csp->headers->first)
3836             {
3837                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3838                {
3839                   log_error(LOG_LEVEL_ERROR,
3840                      "No server or forwarder response received on socket %d. "
3841                      "Closing client socket %d without sending data.",
3842                      csp->server_connection.sfd, csp->cfd);
3843                   log_error(LOG_LEVEL_CLF,
3844                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3845                }
3846                else
3847                {
3848                   log_error(LOG_LEVEL_ERROR,
3849                      "No server or forwarder response received on socket %d.",
3850                      csp->server_connection.sfd);
3851                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3852                }
3853                free_http_request(http);
3854                mark_server_socket_tainted(csp);
3855 #ifdef FEATURE_HTTPS_INSPECTION
3856                close_client_and_server_ssl_connections(csp);
3857 #endif
3858                return;
3859             }
3860
3861             if (!csp->headers->first->str)
3862             {
3863                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3864             }
3865             assert(csp->headers->first->str);
3866
3867             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3868                 strncmpic(csp->headers->first->str, "ICY", 3))
3869             {
3870                /*
3871                 * It doesn't look like a HTTP (or Shoutcast) response:
3872                 * tell the client and log the problem.
3873                 */
3874                if (strlen(csp->headers->first->str) > 30)
3875                {
3876                   csp->headers->first->str[30] = '\0';
3877                }
3878                log_error(LOG_LEVEL_ERROR,
3879                   "Invalid server or forwarder response. Starts with: %s",
3880                   csp->headers->first->str);
3881                log_error(LOG_LEVEL_CLF,
3882                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3883 #ifdef FEATURE_HTTPS_INSPECTION
3884                /*
3885                 * Sending data with standard or secured connection (HTTP/HTTPS)
3886                 */
3887                if (client_use_ssl(csp))
3888                {
3889                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3890                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3891                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3892                      get_write_delay(csp));
3893                }
3894                else
3895 #endif /* def FEATURE_HTTPS_INSPECTION */
3896                {
3897                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3898                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3899                }
3900                free_http_request(http);
3901                mark_server_socket_tainted(csp);
3902 #ifdef FEATURE_HTTPS_INSPECTION
3903                close_client_and_server_ssl_connections(csp);
3904 #endif
3905                return;
3906             }
3907
3908             /*
3909              * Disable redirect checkers, so that they will be only run
3910              * again if the user also enables them through tags.
3911              *
3912              * From a performance point of view it doesn't matter,
3913              * but it prevents duplicated log messages.
3914              */
3915 #ifdef FEATURE_FAST_REDIRECTS
3916             csp->action->flags &= ~ACTION_FAST_REDIRECTS;
3917 #endif
3918             csp->action->flags &= ~ACTION_REDIRECT;
3919
3920             /*
3921              * We have now received the entire server header,
3922              * filter it and send the result to the client
3923              */
3924             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3925             {
3926                log_error(LOG_LEVEL_CLF,
3927                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3928 #ifdef FEATURE_HTTPS_INSPECTION
3929                /*
3930                 * Sending data with standard or secured connection (HTTP/HTTPS)
3931                 */
3932                if (client_use_ssl(csp))
3933                {
3934                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3935                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3936                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3937                      get_write_delay(csp));
3938                }
3939                else
3940 #endif
3941                {
3942                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3943                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3944                }
3945                free_http_request(http);
3946                mark_server_socket_tainted(csp);
3947 #ifdef FEATURE_HTTPS_INSPECTION
3948                close_client_and_server_ssl_connections(csp);
3949 #endif
3950                return;
3951             }
3952             hdr = list_to_text(csp->headers);
3953             if (hdr == NULL)
3954             {
3955                /* FIXME Should handle error properly */
3956                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3957             }
3958
3959             if ((csp->flags & CSP_FLAG_CHUNKED)
3960                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3961                && ((csp->iob->eod - csp->iob->cur) >= 5)
3962                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3963             {
3964                log_error(LOG_LEVEL_CONNECT,
3965                   "Looks like we got the last chunk together with "
3966                   "the server headers. We better stop reading.");
3967                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3968                csp->expected_content_length = byte_count;
3969                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3970             }
3971
3972             csp->server_connection.response_received = time(NULL);
3973
3974             if (crunch_response_triggered(csp, crunchers_light))
3975             {
3976                /*
3977                 * One of the tags created by a server-header
3978                 * tagger triggered a crunch. We already
3979                 * delivered the crunch response to the client
3980                 * and are done here after cleaning up.
3981                 */
3982                freez(hdr);
3983                mark_server_socket_tainted(csp);
3984 #ifdef FEATURE_HTTPS_INSPECTION
3985                close_client_and_server_ssl_connections(csp);
3986 #endif
3987                return;
3988             }
3989
3990             /* Buffer and pcrs filter this if appropriate. */
3991             buffer_and_filter_content = content_requires_filtering(csp);
3992
3993             if (!buffer_and_filter_content)
3994             {
3995                /*
3996                 * Write the server's (modified) header to
3997                 * the client (along with anything else that
3998                 * may be in the buffer). Use standard or secured
3999                 * connection.
4000                 */
4001 #ifdef FEATURE_HTTPS_INSPECTION
4002                if (client_use_ssl(csp))
4003                {
4004                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
4005                           (const unsigned char *)hdr, strlen(hdr),
4006                           get_write_delay(csp)) < 0)
4007                      || ((len = ssl_flush_socket(&(csp->ssl_client_attr),
4008                             csp->iob)) < 0))
4009                   {
4010                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
4011
4012                      /*
4013                       * The write failed, so don't bother mentioning it
4014                       * to the client... it probably can't hear us anyway.
4015                       */
4016                      freez(hdr);
4017                      mark_server_socket_tainted(csp);
4018 #ifdef FEATURE_HTTPS_INSPECTION
4019                      close_client_and_server_ssl_connections(csp);
4020 #endif
4021                      return;
4022                   }
4023                }
4024                else
4025 #endif /* def FEATURE_HTTPS_INSPECTION */
4026                {
4027                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
4028                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
4029                   {
4030                      log_error(LOG_LEVEL_ERROR,
4031                         "write header to client failed");
4032                      /*
4033                       * The write failed, so don't bother mentioning it
4034                       * to the client... it probably can't hear us anyway.
4035                       */
4036                      freez(hdr);
4037                      mark_server_socket_tainted(csp);
4038                      return;
4039                   }
4040                }
4041                                 }
4042
4043             /* we're finished with the server's header */
4044
4045             freez(hdr);
4046             server_body = 1;
4047
4048             /*
4049              * If this was a MS IIS/5 hack then it means the server
4050              * has already closed the connection. Nothing more to read.
4051              * Time to bail.
4052              */
4053             if (ms_iis5_hack)
4054             {
4055                log_error(LOG_LEVEL_ERROR,
4056                   "Closed server connection detected. "
4057                   "Applying the MS IIS5 hack didn't help.");
4058                log_error(LOG_LEVEL_CLF,
4059                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4060 #ifdef FEATURE_HTTPS_INSPECTION
4061                /*
4062                 * Sending data with standard or secured connection (HTTP/HTTPS)
4063                 */
4064                if (client_use_ssl(csp))
4065                {
4066                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4067                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4068                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4069                      get_write_delay(csp));
4070                }
4071                else
4072 #endif /* def FEATURE_HTTPS_INSPECTION */
4073                {
4074                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4075                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4076                }
4077                mark_server_socket_tainted(csp);
4078 #ifdef FEATURE_HTTPS_INSPECTION
4079                close_client_and_server_ssl_connections(csp);
4080 #endif
4081                return;
4082             }
4083          }
4084          continue;
4085       }
4086       mark_server_socket_tainted(csp);
4087 #ifdef FEATURE_HTTPS_INSPECTION
4088       close_client_and_server_ssl_connections(csp);
4089 #endif
4090       return; /* huh? we should never get here */
4091    }
4092
4093    if (csp->content_length == 0)
4094    {
4095       /*
4096        * If Privoxy didn't recalculate the Content-Length,
4097        * byte_count is still correct.
4098        */
4099       csp->content_length = byte_count;
4100    }
4101
4102 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4103    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4104       && (csp->expected_content_length != byte_count))
4105    {
4106       log_error(LOG_LEVEL_CONNECT,
4107          "Received %llu bytes while expecting %llu.",
4108          byte_count, csp->expected_content_length);
4109       mark_server_socket_tainted(csp);
4110    }
4111 #endif
4112
4113 #ifdef FEATURE_HTTPS_INSPECTION
4114    if (client_use_ssl(csp))
4115    {
4116       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
4117          csp->ip_addr_str, http->gpc, http->hostport, http->path,
4118          http->version, csp->content_length);
4119    }
4120    else
4121 #endif
4122    {
4123       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
4124          csp->ip_addr_str, http->ocmd, csp->content_length);
4125    }
4126    csp->server_connection.timestamp = time(NULL);
4127 }
4128
4129
4130 /*********************************************************************
4131  *
4132  * Function    :  chat
4133  *
4134  * Description :  Once a connection from the client has been accepted,
4135  *                this function is called (via serve()) to handle the
4136  *                main business of the communication.  This function
4137  *                returns after dealing with a single request. It can
4138  *                be called multiple times with the same client socket
4139  *                if the client is keeping the connection alive.
4140  *
4141  *                The decision whether or not a client connection will
4142  *                be kept alive is up to the caller which also must
4143  *                close the client socket when done.
4144  *
4145  *                FIXME: chat is nearly thousand lines long.
4146  *                Ridiculous.
4147  *
4148  * Parameters  :
4149  *          1  :  csp = Current client state (buffers, headers, etc...)
4150  *
4151  * Returns     :  Nothing.
4152  *
4153  *********************************************************************/
4154 static void chat(struct client_state *csp)
4155 {
4156    const struct forward_spec *fwd;
4157    struct http_request *http;
4158    /* Skeleton for HTTP response, if we should intercept the request */
4159    struct http_response *rsp;
4160 #ifdef FEATURE_HTTPS_INSPECTION
4161    int use_ssl_tunnel = 0;
4162 #endif
4163
4164    http = csp->http;
4165
4166    if (receive_client_request(csp) != JB_ERR_OK)
4167    {
4168       return;
4169    }
4170    if (parse_client_request(csp) != JB_ERR_OK)
4171    {
4172       return;
4173    }
4174
4175 #ifdef FEATURE_HTTPS_INSPECTION
4176    /*
4177     * Setting flags to use old solution with SSL tunnel and to disable
4178     * certificate verification.
4179     */
4180    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
4181       && !cgi_page_requested(csp->http->host))
4182    {
4183       use_ssl_tunnel = 1;
4184    }
4185
4186    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
4187    {
4188       csp->dont_verify_certificate = 1;
4189    }
4190 #endif
4191
4192    /*
4193     * build the http request to send to the server
4194     * we have to do one of the following:
4195     *
4196     * create =    use the original HTTP request to create a new
4197     *             HTTP request that has either the path component
4198     *             without the http://domainspec (w/path) or the
4199     *             full orininal URL (w/url)
4200     *             Note that the path and/or the HTTP version may
4201     *             have been altered by now.
4202     *
4203     * SSL proxy = Open a socket to the host:port of the server
4204     *             and create TLS/SSL connection with server and
4205     *             with client. Then behave like mediator between
4206     *             client and server over TLS/SSL.
4207     *
4208     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4209     *    with     request to a parent proxy. Note that we'll be sending
4210     * forwarding  the CFAIL message ourselves if connecting to the parent
4211     *             fails, but we won't send a CSUCCEED message if it works,
4212     *             since that would result in a double message (ours and the
4213     *             parent's). After sending the request to the parent, we
4214     *             must parse answer and send it to client. If connection
4215     *             with server is established, we do TLS/SSL proxy. Otherwise
4216     *             we send parent response to client and close connections.
4217     *
4218     * here's the matrix:
4219     *                        SSL
4220     *                    0        1
4221     *                +--------+--------+
4222     *                |        |        |
4223     *             0  | create |   SSL  |
4224     *                | w/path |  proxy |
4225     *  Forwarding    +--------+--------+
4226     *                |        |   SSL  |
4227     *             1  | create |  proxy |
4228     *                | w/url  |+forward|
4229     *                +--------+--------+
4230     *
4231     */
4232
4233 #ifdef FEATURE_HTTPS_INSPECTION
4234    /*
4235     * Presetting SSL client and server flags
4236     */
4237    if (http->ssl && !use_ssl_tunnel)
4238    {
4239       http->client_ssl = 1;
4240       http->server_ssl = 1;
4241    }
4242    else
4243    {
4244       http->client_ssl = 0;
4245       http->server_ssl = 0;
4246    }
4247 #endif
4248
4249 #ifdef FEATURE_HTTPS_INSPECTION
4250    /*
4251     * Log the request unless we're https inspecting
4252     * in which case we don't have the path yet and
4253     * will log the request later.
4254     */
4255    if (!client_use_ssl(csp))
4256 #endif
4257    {
4258       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4259    }
4260
4261    if (http->ssl && connect_port_is_forbidden(csp))
4262    {
4263       const char *acceptable_connect_ports =
4264          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4265       assert(NULL != acceptable_connect_ports);
4266       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4267          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4268          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4269       csp->action->flags |= ACTION_BLOCK;
4270       http->ssl = 0;
4271 #ifdef FEATURE_HTTPS_INSPECTION
4272       http->client_ssl = 0;
4273       http->server_ssl = 0;
4274 #endif
4275    }
4276
4277    /*
4278     * We have a request. Check if one of the crunchers wants it
4279     * unless the client wants to use TLS/SSL in which case we
4280     * haven't setup the TLS context yet and will send the crunch
4281     * response later.
4282     */
4283    if (
4284 #ifdef FEATURE_HTTPS_INSPECTION
4285        !client_use_ssl(csp) &&
4286 #endif
4287        crunch_response_triggered(csp, crunchers_all))
4288    {
4289       /*
4290        * Yes. The client got the crunch response and we're done here.
4291        */
4292       return;
4293    }
4294
4295 #ifdef FEATURE_HTTPS_INSPECTION
4296    if (client_use_ssl(csp) && !use_ssl_tunnel)
4297    {
4298       int ret;
4299       /*
4300        * Creating a SSL proxy.
4301        *
4302        * By sending the CSUCCEED message we're lying to the client as
4303        * the connection hasn't actually been established yet. We don't
4304        * establish the connection until we have seen and parsed the
4305        * encrypted client headers.
4306        */
4307       if (write_socket_delayed(csp->cfd, CSUCCEED,
4308             strlen(CSUCCEED), get_write_delay(csp)) != 0)
4309       {
4310          log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4311          return;
4312       }
4313
4314       ret = create_client_ssl_connection(csp);
4315       if (ret != 0)
4316       {
4317          log_error(LOG_LEVEL_ERROR,
4318             "Failed to open a secure connection with the client");
4319          return;
4320       }
4321       if (JB_ERR_OK != process_encrypted_request(csp))
4322       {
4323          close_client_ssl_connection(csp);
4324          return;
4325       }
4326       /*
4327        * We have an encrypted request. Check if one of the crunchers now
4328        * wants it (for example because the previously invisible path was
4329        * required to match).
4330        */
4331       if (crunch_response_triggered(csp, crunchers_all))
4332       {
4333          /*
4334           * Yes. The client got the crunch response and we're done here.
4335           */
4336          return;
4337       }
4338    }
4339 #endif
4340
4341    /* decide how to route the HTTP request */
4342    fwd = forward_url(csp, http);
4343
4344    freez(csp->headers->first->str);
4345    build_request_line(csp, fwd, &csp->headers->first->str);
4346
4347    log_applied_actions(csp->action);
4348    if (fwd->forward_host)
4349    {
4350       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4351          fwd->forward_host, fwd->forward_port, http->hostport);
4352    }
4353    else
4354    {
4355       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4356    }
4357
4358    /* here we connect to the server, gateway, or the forwarder */
4359
4360 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4361    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4362       && socket_is_still_alive(csp->server_connection.sfd)
4363       && connection_destination_matches(&csp->server_connection, http, fwd))
4364    {
4365       log_error(LOG_LEVEL_CONNECT,
4366          "Reusing server socket %d connected to %s. Total requests: %u.",
4367          csp->server_connection.sfd, csp->server_connection.host,
4368          csp->server_connection.requests_sent_total);
4369    }
4370    else
4371    {
4372       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4373       {
4374 #ifdef FEATURE_CONNECTION_SHARING
4375          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4376 #ifdef FEATURE_HTTPS_INSPECTION
4377             && !server_use_ssl(csp)
4378 #endif
4379             )
4380          {
4381             remember_connection(&csp->server_connection);
4382          }
4383          else
4384 #endif /* def FEATURE_CONNECTION_SHARING */
4385          {
4386             log_error(LOG_LEVEL_CONNECT,
4387                "Closing server socket %d connected to %s. Total requests: %u.",
4388                csp->server_connection.sfd, csp->server_connection.host,
4389                csp->server_connection.requests_sent_total);
4390             close_socket(csp->server_connection.sfd);
4391          }
4392          mark_connection_closed(&csp->server_connection);
4393       }
4394 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4395
4396       /*
4397        * Connecting to destination server
4398        */
4399       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4400
4401       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4402       {
4403          if (fwd->type != SOCKS_NONE)
4404          {
4405             /* Socks error. */
4406             rsp = error_response(csp, "forwarding-failed");
4407          }
4408          else if (errno == EINVAL)
4409          {
4410             rsp = error_response(csp, "no-such-domain");
4411          }
4412          else
4413          {
4414             rsp = error_response(csp, "connect-failed");
4415          }
4416
4417          /* Write the answer to the client */
4418          if (rsp != NULL)
4419          {
4420             send_crunch_response(csp, rsp);
4421          }
4422
4423          /*
4424           * Temporary workaround to prevent already-read client
4425           * bodies from being parsed as new requests. For now we
4426           * err on the safe side and throw all the following
4427           * requests under the bus, even if no client body has been
4428           * buffered. A compliant client will repeat the dropped
4429           * requests on an untainted connection.
4430           *
4431           * The proper fix is to discard the no longer needed
4432           * client body in the buffer (if there is one) and to
4433           * continue parsing the bytes that follow.
4434           */
4435 #ifdef FEATURE_HTTPS_INSPECTION
4436          close_client_ssl_connection(csp);
4437 #endif
4438          drain_and_close_socket(csp->cfd);
4439          csp->cfd = JB_INVALID_SOCKET;
4440
4441          return;
4442       }
4443
4444 #ifdef FEATURE_HTTPS_INSPECTION
4445       /*
4446        * Creating TLS/SSL connections with destination server or parent
4447        * proxy. If forwarding is enabled, we must send client request to
4448        * parent proxy and receive, parse and resend parent proxy answer.
4449        */
4450       if (http->ssl && !use_ssl_tunnel)
4451       {
4452          if (fwd->forward_host != NULL)
4453          {
4454             char server_response[BUFFER_SIZE];
4455             int ret = 0;
4456             int len = 0;
4457             char *hdr = list_to_text(csp->headers);
4458             memset(server_response, 0, sizeof(server_response));
4459
4460             if (hdr == NULL)
4461             {
4462                log_error(LOG_LEVEL_FATAL,
4463                   "Out of memory parsing client header");
4464             }
4465             list_remove_all(csp->headers);
4466
4467             /*
4468              * Sending client's CONNECT request to the parent proxy
4469              */
4470             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4471
4472             freez(hdr);
4473
4474             if (ret != 0)
4475             {
4476                log_error(LOG_LEVEL_CONNECT,
4477                   "Sending request headers to: %s failed", http->hostport);
4478                mark_server_socket_tainted(csp);
4479                close_client_ssl_connection(csp);
4480                return;
4481             }
4482
4483             /* Waiting for parent proxy server response */
4484             len = read_socket(csp->server_connection.sfd, server_response,
4485                sizeof(server_response)-1);
4486
4487             if (len <= 0)
4488             {
4489                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4490                   "server on socket %d.", csp->server_connection.sfd);
4491
4492                rsp = error_response(csp, "no-server-data");
4493                if (rsp)
4494                {
4495                   send_crunch_response(csp, rsp);
4496                }
4497                mark_server_socket_tainted(csp);
4498                close_client_ssl_connection(csp);
4499                return;
4500             }
4501
4502             /*
4503              * Test if the connection to the destination server was
4504              * established successfully by the parent proxy.
4505              */
4506             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4507             {
4508                log_error(LOG_LEVEL_ERROR,
4509                   "The forwarder %s failed to establish a connection with %s",
4510                   fwd->forward_host, http->host);
4511                rsp = error_response(csp, "connect-failed");
4512                if (rsp)
4513                {
4514                   send_crunch_response(csp, rsp);
4515                }
4516                mark_server_socket_tainted(csp);
4517                close_client_ssl_connection(csp);
4518                return;
4519             }
4520          } /* -END- if (fwd->forward_host != NULL) */
4521
4522          /*
4523           * We can now create the TLS/SSL connection with the destination server.
4524           */
4525          int ret = create_server_ssl_connection(csp);
4526          if (ret != 0)
4527          {
4528             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4529                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4530             {
4531                /*
4532                 * If the server certificate is invalid, we must inform
4533                 * the client and then close connection to the client.
4534                 */
4535                ssl_send_certificate_error(csp);
4536                close_client_and_server_ssl_connections(csp);
4537                return;
4538             }
4539             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4540              || csp->server_cert_verification_result == SSL_CERT_VALID)
4541             {
4542                /*
4543                 * The TLS/SSL connection wasn't created but an invalid
4544                 * certificate wasn't detected. Report it as connection
4545                 * failure.
4546                 */
4547                rsp = error_response(csp, "connect-failed");
4548                if (rsp)
4549                {
4550                   send_crunch_response(csp, rsp);
4551                }
4552                close_client_and_server_ssl_connections(csp);
4553                return;
4554             }
4555          }
4556       }/* -END- if (http->ssl) */
4557 #endif /* def FEATURE_HTTPS_INSPECTION */
4558
4559 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4560       save_connection_destination(csp->server_connection.sfd,
4561          http, fwd, &csp->server_connection);
4562       csp->server_connection.keep_alive_timeout =
4563          (unsigned)csp->config->keep_alive_timeout;
4564    }
4565 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4566
4567    csp->server_connection.requests_sent_total++;
4568
4569    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4570    {
4571       /* Client headers have been sent optimistically */
4572       assert(csp->headers->last == NULL);
4573    }
4574    else if (http->ssl == 0 || (fwd->forward_host
4575 #ifdef FEATURE_HTTPS_INSPECTION
4576          && use_ssl_tunnel
4577 #endif
4578            ))
4579    {
4580       if (send_http_request(csp))
4581       {
4582          rsp = error_response(csp, "connect-failed");
4583          if (rsp)
4584          {
4585             send_crunch_response(csp, rsp);
4586          }
4587          return;
4588       }
4589    }
4590    else
4591    {
4592       /*
4593        * Using old solution with SSL tunnel or new solution with SSL proxy
4594        */
4595       list_remove_all(csp->headers);
4596 #ifdef FEATURE_HTTPS_INSPECTION
4597       if (use_ssl_tunnel)
4598 #endif
4599       {
4600          /*
4601          * We're running an SSL tunnel and we're not forwarding,
4602          * so just ditch the client headers, send the "connect succeeded"
4603          * message to the client, flush the rest, and get out of the way.
4604          */
4605          if (write_socket_delayed(csp->cfd, CSUCCEED,
4606                strlen(CSUCCEED), get_write_delay(csp)))
4607          {
4608             return;
4609          }
4610       }
4611 #ifdef FEATURE_HTTPS_INSPECTION
4612       else
4613       {
4614          /*
4615           * If server certificate has been verified and is invalid,
4616           * we must inform the client and then close the connection
4617           * with client and server.
4618           */
4619          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4620              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4621          {
4622             ssl_send_certificate_error(csp);
4623             close_client_and_server_ssl_connections(csp);
4624             return;
4625          }
4626          if (send_https_request(csp))
4627          {
4628             rsp = error_response(csp, "connect-failed");
4629             if (rsp)
4630             {
4631                send_crunch_response(csp, rsp);
4632             }
4633             close_client_and_server_ssl_connections(csp);
4634             return;
4635          }
4636       }
4637 #endif /* def FEATURE_HTTPS_INSPECTION */
4638       clear_iob(csp->client_iob);
4639    }/* -END- else ... if (http->ssl == 1) */
4640
4641    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4642
4643    /* XXX: should the time start earlier for optimistically sent data? */
4644    csp->server_connection.request_sent = time(NULL);
4645
4646    handle_established_connection(csp);
4647    freez(csp->receive_buffer);
4648 }
4649
4650
4651 #ifdef FUZZ
4652 /*********************************************************************
4653  *
4654  * Function    :  fuzz_server_response
4655  *
4656  * Description :  Treat the input as a whole server response.
4657  *
4658  * Parameters  :
4659  *          1  :  csp = Current client state (buffers, headers, etc...)
4660  *          2  :  fuzz_input_file = File to read the input from.
4661  *
4662  * Returns     :  0
4663  *
4664  *********************************************************************/
4665 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4666 {
4667    static struct forward_spec fwd; /* Zero'd due to being static */
4668    csp->cfd = 0;
4669
4670    if (strcmp(fuzz_input_file, "-") == 0)
4671    {
4672       /* XXX: Doesn't work yet. */
4673       csp->server_connection.sfd = 0;
4674    }
4675    else
4676    {
4677       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4678       if (csp->server_connection.sfd == -1)
4679       {
4680          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4681             fuzz_input_file);
4682       }
4683    }
4684    csp->fwd = &fwd;
4685    csp->content_type |= CT_GIF;
4686    csp->action->flags |= ACTION_DEANIMATE;
4687    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4688
4689    csp->http->path = strdup_or_die("/");
4690    csp->http->host = strdup_or_die("fuzz.example.org");
4691    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4692    /* Prevent client socket monitoring */
4693    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4694    csp->flags |= CSP_FLAG_CHUNKED;
4695
4696    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4697    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4698
4699    csp->content_type |= CT_DECLARED|CT_GIF;
4700
4701    csp->config->socket_timeout = 0;
4702
4703    cgi_init_error_messages();
4704
4705    handle_established_connection(csp);
4706    freez(csp->receive_buffer);
4707
4708    return 0;
4709 }
4710 #endif
4711
4712
4713 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4714 /*********************************************************************
4715  *
4716  * Function    :  prepare_csp_for_next_request
4717  *
4718  * Description :  Put the csp in a mostly vergin state.
4719  *
4720  * Parameters  :
4721  *          1  :  csp = Current client state (buffers, headers, etc...)
4722  *
4723  * Returns     :  N/A
4724  *
4725  *********************************************************************/
4726 static void prepare_csp_for_next_request(struct client_state *csp)
4727 {
4728    csp->content_type = 0;
4729    csp->content_length = 0;
4730    csp->expected_content_length = 0;
4731    csp->expected_client_content_length = 0;
4732    list_remove_all(csp->headers);
4733    clear_iob(csp->iob);
4734    freez(csp->error_message);
4735    free_http_request(csp->http);
4736    destroy_list(csp->headers);
4737 #ifdef FEATURE_HTTPS_INSPECTION
4738    destroy_list(csp->https_headers);
4739 #endif
4740    destroy_list(csp->tags);
4741 #ifdef FEATURE_CLIENT_TAGS
4742    destroy_list(csp->client_tags);
4743    freez(csp->client_address);
4744 #endif
4745    free_current_action(csp->action);
4746    if (NULL != csp->fwd)
4747    {
4748       unload_forward_spec(csp->fwd);
4749       csp->fwd = NULL;
4750    }
4751    /* XXX: Store per-connection flags someplace else. */
4752    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4753 #ifdef FEATURE_TOGGLE
4754    if (global_toggle_state)
4755 #endif /* def FEATURE_TOGGLE */
4756    {
4757       csp->flags |= CSP_FLAG_TOGGLED_ON;
4758    }
4759
4760    if (csp->client_iob->eod > csp->client_iob->cur)
4761    {
4762       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4763       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4764
4765       assert(bytes_to_shift > 0);
4766       assert(data_length > 0);
4767
4768       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4769          data_length, bytes_to_shift);
4770       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4771       csp->client_iob->cur = csp->client_iob->buf;
4772       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4773       csp->client_iob->eod = csp->client_iob->buf + data_length;
4774       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4775
4776       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4777    }
4778    else
4779    {
4780       /*
4781        * We mainly care about resetting client_iob->cur so we don't
4782        * waste buffer space at the beginning and don't mess up the
4783        * request restoration done by cgi_show_request().
4784        *
4785        * Freeing the buffer itself isn't technically necessary,
4786        * but makes debugging more convenient.
4787        */
4788       clear_iob(csp->client_iob);
4789    }
4790 }
4791 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4792
4793
4794 /*********************************************************************
4795  *
4796  * Function    :  serve
4797  *
4798  * Description :  This is little more than chat.  We only "serve" to
4799  *                to close (or remember) any socket that chat may have
4800  *                opened.
4801  *
4802  * Parameters  :
4803  *          1  :  csp = Current client state (buffers, headers, etc...)
4804  *
4805  * Returns     :  N/A
4806  *
4807  *********************************************************************/
4808 static void serve(struct client_state *csp)
4809 {
4810    int config_file_change_detected = 0; /* Only used for debugging */
4811 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4812 #ifdef FEATURE_CONNECTION_SHARING
4813    static int monitor_thread_running = 0;
4814 #endif /* def FEATURE_CONNECTION_SHARING */
4815    int continue_chatting = 0;
4816
4817    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4818       csp->ip_addr_str, csp->cfd);
4819
4820    do
4821    {
4822       unsigned int latency;
4823
4824 #ifdef FEATURE_HTTPS_INSPECTION
4825       if (continue_chatting && client_use_ssl(csp))
4826       {
4827          continue_https_chat(csp);
4828       }
4829       else
4830 #endif
4831       {
4832          chat(csp);
4833       }
4834
4835       /*
4836        * If the request has been crunched,
4837        * the calculated latency is zero.
4838        */
4839       latency = (unsigned)(csp->server_connection.response_received -
4840          csp->server_connection.request_sent) / 2;
4841
4842       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4843          && (csp->flags & CSP_FLAG_CRUNCHED)
4844          && (csp->expected_client_content_length != 0))
4845       {
4846          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4847          log_error(LOG_LEVEL_CONNECT,
4848             "Tainting client socket %d due to unread data.", csp->cfd);
4849       }
4850
4851       continue_chatting = (csp->config->feature_flags
4852          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4853          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4854          && (csp->cfd != JB_INVALID_SOCKET)
4855          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4856          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4857             || (csp->flags & CSP_FLAG_CHUNKED));
4858
4859       if (!(csp->flags & CSP_FLAG_CRUNCHED)
4860          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4861       {
4862          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4863          {
4864             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4865          }
4866          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4867             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4868             || !socket_is_still_alive(csp->server_connection.sfd)
4869             || !(latency < csp->server_connection.keep_alive_timeout))
4870          {
4871             log_error(LOG_LEVEL_CONNECT,
4872                "Closing server socket %d connected to %s. "
4873                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
4874                csp->server_connection.sfd, (csp->server_connection.host != NULL) ?
4875                csp->server_connection.host : csp->http->host,
4876                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4877                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4878                socket_is_still_alive(csp->server_connection.sfd),
4879                csp->server_connection.keep_alive_timeout);
4880 #ifdef FEATURE_CONNECTION_SHARING
4881             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4882             {
4883                forget_connection(csp->server_connection.sfd);
4884             }
4885 #endif /* def FEATURE_CONNECTION_SHARING */
4886 #ifdef FEATURE_HTTPS_INSPECTION
4887             close_server_ssl_connection(csp);
4888 #endif
4889             close_socket(csp->server_connection.sfd);
4890             mark_connection_closed(&csp->server_connection);
4891 #ifdef FEATURE_HTTPS_INSPECTION
4892             if (continue_chatting && client_use_ssl(csp))
4893             {
4894                /*
4895                 * Close the client socket as well as Privoxy currently
4896                 * can't establish a new server connection when the client
4897                 * socket is reused and would drop the connection in
4898                 * continue_https_chat() anyway.
4899                 */
4900                continue_chatting = 0;
4901                csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4902                log_error(LOG_LEVEL_CONNECT,
4903                   "Client socket %d is no longer usable. "
4904                   "The server socket has been closed.", csp->cfd);
4905             }
4906 #endif
4907          }
4908       }
4909
4910       if (continue_chatting && any_loaded_file_changed(csp))
4911       {
4912          continue_chatting = 0;
4913          config_file_change_detected = 1;
4914       }
4915 #ifdef FEATURE_HTTPS_INSPECTION
4916       if (continue_chatting && client_use_ssl(csp) &&
4917          csp->ssl_with_client_is_opened == 0)
4918       {
4919          continue_chatting = 0;
4920          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
4921             "The TLS session has been terminated.", csp->cfd);
4922       }
4923 #endif
4924
4925       if (continue_chatting)
4926       {
4927          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4928             && socket_is_still_alive(csp->cfd))
4929          {
4930             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4931                "pipelined on socket %d and the socket is still alive.",
4932                csp->requests_received_total+1, csp->cfd);
4933             prepare_csp_for_next_request(csp);
4934             continue;
4935          }
4936
4937          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
4938          {
4939             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4940             {
4941                log_error(LOG_LEVEL_CONNECT,
4942                   "Waiting for the next client request on socket %d. "
4943                   "Keeping the server socket %d to %s open.",
4944                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
4945             }
4946             else
4947             {
4948                log_error(LOG_LEVEL_CONNECT,
4949                   "Waiting for the next client request on socket %d. "
4950                   "No server socket to keep open.", csp->cfd);
4951             }
4952          }
4953
4954          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4955             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
4956             && socket_is_still_alive(csp->cfd))
4957          {
4958             log_error(LOG_LEVEL_CONNECT,
4959                "Data arrived in time on client socket %d. Requests so far: %u",
4960                csp->cfd, csp->requests_received_total);
4961             prepare_csp_for_next_request(csp);
4962          }
4963          else
4964          {
4965 #ifdef FEATURE_CONNECTION_SHARING
4966             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4967                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
4968                && (socket_is_still_alive(csp->server_connection.sfd))
4969 #ifdef FEATURE_HTTPS_INSPECTION
4970                && !server_use_ssl(csp)
4971 #endif
4972                 )
4973             {
4974                time_t time_open = time(NULL) - csp->server_connection.timestamp;
4975
4976                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
4977                {
4978                   break;
4979                }
4980
4981                remember_connection(&csp->server_connection);
4982                csp->server_connection.sfd = JB_INVALID_SOCKET;
4983                drain_and_close_socket(csp->cfd);
4984                csp->cfd = JB_INVALID_SOCKET;
4985                privoxy_mutex_lock(&connection_reuse_mutex);
4986                if (!monitor_thread_running)
4987                {
4988                   monitor_thread_running = 1;
4989                   privoxy_mutex_unlock(&connection_reuse_mutex);
4990                   wait_for_alive_connections();
4991                   privoxy_mutex_lock(&connection_reuse_mutex);
4992                   monitor_thread_running = 0;
4993                }
4994                privoxy_mutex_unlock(&connection_reuse_mutex);
4995             }
4996 #endif /* def FEATURE_CONNECTION_SHARING */
4997             break;
4998          }
4999       }
5000       else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5001       {
5002          log_error(LOG_LEVEL_CONNECT,
5003             "Closing server socket %d connected to %s. Keep-alive: %u. "
5004             "Tainted: %u. Socket alive: %u. Timeout: %u. "
5005             "Configuration file change detected: %u",
5006             csp->server_connection.sfd, csp->server_connection.host,
5007             0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5008             0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5009             socket_is_still_alive(csp->server_connection.sfd),
5010             csp->server_connection.keep_alive_timeout,
5011             config_file_change_detected);
5012       }
5013    } while (continue_chatting);
5014
5015 #else
5016    chat(csp);
5017 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5018
5019    if (csp->cfd != JB_INVALID_SOCKET)
5020    {
5021       log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
5022          "Keep-alive: %u. Socket alive: %u. Data available: %u. "
5023          "Configuration file change detected: %u. Requests received: %u.",
5024          csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
5025          socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
5026          config_file_change_detected, csp->requests_received_total);
5027 #ifdef FEATURE_HTTPS_INSPECTION
5028       close_client_ssl_connection(csp);
5029 #endif
5030       drain_and_close_socket(csp->cfd);
5031    }
5032
5033    if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5034    {
5035 #ifdef FEATURE_CONNECTION_SHARING
5036       if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5037       {
5038          forget_connection(csp->server_connection.sfd);
5039       }
5040 #endif /* def FEATURE_CONNECTION_SHARING */
5041
5042 #ifdef FEATURE_HTTPS_INSPECTION
5043       close_server_ssl_connection(csp);
5044 #endif /* def FEATURE_HTTPS_INSPECTION */
5045
5046       close_socket(csp->server_connection.sfd);
5047    }
5048
5049 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5050    mark_connection_closed(&csp->server_connection);
5051 #endif
5052
5053    free_csp_resources(csp);
5054
5055    csp->flags &= ~CSP_FLAG_ACTIVE;
5056
5057 }
5058
5059
5060 #ifdef __BEOS__
5061 /*********************************************************************
5062  *
5063  * Function    :  server_thread
5064  *
5065  * Description :  We only exist to call `serve' in a threaded environment.
5066  *
5067  * Parameters  :
5068  *          1  :  data = Current client state (buffers, headers, etc...)
5069  *
5070  * Returns     :  Always 0.
5071  *
5072  *********************************************************************/
5073 static int32 server_thread(void *data)
5074 {
5075    serve((struct client_state *) data);
5076    return 0;
5077
5078 }
5079 #endif
5080
5081
5082 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5083 /*********************************************************************
5084  *
5085  * Function    :  usage
5086  *
5087  * Description :  Print usage info & exit.
5088  *
5089  * Parameters  :  Pointer to argv[0] for identifying ourselves
5090  *
5091  * Returns     :  No. ,-)
5092  *
5093  *********************************************************************/
5094 static void usage(const char *name)
5095 {
5096    printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
5097           "Usage: %s [--config-test] "
5098 #if defined(unix)
5099           "[--chroot] "
5100 #endif /* defined(unix) */
5101           "[--help] "
5102 #if defined(unix)
5103           "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
5104 #endif /* defined(unix) */
5105          "[--version] [configfile]\n",
5106           name);
5107
5108 #ifdef FUZZ
5109    show_fuzz_usage(name);
5110 #endif
5111
5112    printf("Aborting\n");
5113
5114    exit(2);
5115
5116 }
5117 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
5118
5119
5120 #ifdef MUTEX_LOCKS_AVAILABLE
5121 /*********************************************************************
5122  *
5123  * Function    :  privoxy_mutex_lock
5124  *
5125  * Description :  Locks a mutex.
5126  *
5127  * Parameters  :
5128  *          1  :  mutex = The mutex to lock.
5129  *
5130  * Returns     :  Void. May exit in case of errors.
5131  *
5132  *********************************************************************/
5133 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
5134 {
5135 #ifdef FEATURE_PTHREAD
5136    int err = pthread_mutex_lock(mutex);
5137    if (err)
5138    {
5139       if (mutex != &log_mutex)
5140       {
5141          log_error(LOG_LEVEL_FATAL,
5142             "Mutex locking failed: %s.\n", strerror(err));
5143       }
5144       exit(1);
5145    }
5146 #else
5147    EnterCriticalSection(mutex);
5148 #endif /* def FEATURE_PTHREAD */
5149 }
5150
5151
5152 /*********************************************************************
5153  *
5154  * Function    :  privoxy_mutex_unlock
5155  *
5156  * Description :  Unlocks a mutex.
5157  *
5158  * Parameters  :
5159  *          1  :  mutex = The mutex to unlock.
5160  *
5161  * Returns     :  Void. May exit in case of errors.
5162  *
5163  *********************************************************************/
5164 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
5165 {
5166 #ifdef FEATURE_PTHREAD
5167    int err = pthread_mutex_unlock(mutex);
5168    if (err)
5169    {
5170       if (mutex != &log_mutex)
5171       {
5172          log_error(LOG_LEVEL_FATAL,
5173             "Mutex unlocking failed: %s.\n", strerror(err));
5174       }
5175       exit(1);
5176    }
5177 #else
5178    LeaveCriticalSection(mutex);
5179 #endif /* def FEATURE_PTHREAD */
5180 }
5181
5182
5183 /*********************************************************************
5184  *
5185  * Function    :  privoxy_mutex_init
5186  *
5187  * Description :  Prepares a mutex.
5188  *
5189  * Parameters  :
5190  *          1  :  mutex = The mutex to initialize.
5191  *
5192  * Returns     :  Void. May exit in case of errors.
5193  *
5194  *********************************************************************/
5195 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
5196 {
5197 #ifdef FEATURE_PTHREAD
5198    int err = pthread_mutex_init(mutex, 0);
5199    if (err)
5200    {
5201       printf("Fatal error. Mutex initialization failed: %s.\n",
5202          strerror(err));
5203       exit(1);
5204    }
5205 #else
5206    InitializeCriticalSection(mutex);
5207 #endif /* def FEATURE_PTHREAD */
5208 }
5209 #endif /* def MUTEX_LOCKS_AVAILABLE */
5210
5211 /*********************************************************************
5212  *
5213  * Function    :  initialize_mutexes
5214  *
5215  * Description :  Prepares mutexes if mutex support is available.
5216  *
5217  * Parameters  :  None
5218  *
5219  * Returns     :  Void, exits in case of errors.
5220  *
5221  *********************************************************************/
5222 static void initialize_mutexes(void)
5223 {
5224 #ifdef MUTEX_LOCKS_AVAILABLE
5225    /*
5226     * Prepare global mutex semaphores
5227     */
5228
5229 #ifdef FEATURE_HTTPS_INSPECTION
5230    privoxy_mutex_init(&certificate_mutex);
5231    privoxy_mutex_init(&ssl_init_mutex);
5232 #endif
5233
5234    privoxy_mutex_init(&log_mutex);
5235    privoxy_mutex_init(&log_init_mutex);
5236    privoxy_mutex_init(&connection_reuse_mutex);
5237 #ifdef FEATURE_EXTERNAL_FILTERS
5238    privoxy_mutex_init(&external_filter_mutex);
5239 #endif
5240 #ifdef FEATURE_CLIENT_TAGS
5241    privoxy_mutex_init(&client_tags_mutex);
5242 #endif
5243 #ifdef FEATURE_EXTENDED_STATISTICS
5244    privoxy_mutex_init(&filter_statistics_mutex);
5245    privoxy_mutex_init(&block_statistics_mutex);
5246 #endif
5247
5248    /*
5249     * XXX: The assumptions below are a bit naive
5250     * and can cause locks that aren't necessary.
5251     *
5252     * For example older FreeBSD versions (< 6.x?)
5253     * have no gethostbyname_r, but gethostbyname is
5254     * thread safe.
5255     */
5256 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
5257    privoxy_mutex_init(&resolver_mutex);
5258 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
5259    /*
5260     * XXX: should we use a single mutex for
5261     * localtime() and gmtime() as well?
5262     */
5263 #ifndef HAVE_GMTIME_R
5264    privoxy_mutex_init(&gmtime_mutex);
5265 #endif /* ndef HAVE_GMTIME_R */
5266
5267 #ifndef HAVE_LOCALTIME_R
5268    privoxy_mutex_init(&localtime_mutex);
5269 #endif /* ndef HAVE_GMTIME_R */
5270
5271 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
5272    privoxy_mutex_init(&rand_mutex);
5273 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
5274
5275 #endif /* def MUTEX_LOCKS_AVAILABLE */
5276 }
5277
5278 /*********************************************************************
5279  *
5280  * Function    :  main
5281  *
5282  * Description :  Load the config file and start the listen loop.
5283  *                This function is a lot more *sane* with the `load_config'
5284  *                and `listen_loop' functions; although it stills does
5285  *                a *little* too much for my taste.
5286  *
5287  * Parameters  :
5288  *          1  :  argc = Number of parameters (including $0).
5289  *          2  :  argv = Array of (char *)'s to the parameters.
5290  *
5291  * Returns     :  1 if : can't open config file, unrecognized directive,
5292  *                stats requested in multi-thread mode, can't open the
5293  *                log file, can't open the jar file, listen port is invalid,
5294  *                any load fails, and can't bind port.
5295  *
5296  *                Else main never returns, the process must be signaled
5297  *                to terminate execution.  Or, on Windows, use the
5298  *                "File", "Exit" menu option.
5299  *
5300  *********************************************************************/
5301 #ifdef __MINGW32__
5302 int real_main(int argc, char **argv)
5303 #else
5304 int main(int argc, char **argv)
5305 #endif
5306 {
5307    int argc_pos = 0;
5308    int do_config_test = 0;
5309 #ifndef HAVE_ARC4RANDOM
5310    unsigned int random_seed;
5311 #endif
5312 #ifdef unix
5313    struct passwd *pw = NULL;
5314    struct group *grp = NULL;
5315    int do_chroot = 0;
5316    char *pre_chroot_nslookup_to_load_resolver = NULL;
5317 #endif
5318 #ifdef FUZZ
5319    char *fuzz_input_type = NULL;
5320    char *fuzz_input_file = NULL;
5321 #endif
5322
5323    Argc = argc;
5324    Argv = argv;
5325
5326    configfile =
5327 #if !defined(_WIN32)
5328    "config"
5329 #else
5330    "config.txt"
5331 #endif
5332       ;
5333
5334    /* Prepare mutexes if supported and necessary. */
5335    initialize_mutexes();
5336
5337    /* Enable logging until further notice. */
5338    init_log_module();
5339
5340    /*
5341     * Parse the command line arguments
5342     *
5343     * XXX: simply printing usage information in case of
5344     * invalid arguments isn't particularly user friendly.
5345     */
5346    while (++argc_pos < argc)
5347    {
5348 #ifdef _WIN32
5349       /* Check to see if the service must be installed or uninstalled */
5350       if (strncmp(argv[argc_pos], "--install", 9) == 0)
5351       {
5352          const char *pName = argv[argc_pos] + 9;
5353          if (*pName == ':')
5354             pName++;
5355          exit((install_service(pName)) ? 0 : 1);
5356       }
5357       else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
5358       {
5359          const char *pName = argv[argc_pos] + 11;
5360          if (*pName == ':')
5361             pName++;
5362          exit((uninstall_service(pName)) ? 0 : 1);
5363       }
5364       else if (strcmp(argv[argc_pos], "--service") == 0)
5365       {
5366          bRunAsService = TRUE;
5367          w32_set_service_cwd();
5368          atexit(w32_service_exit_notify);
5369       }
5370       else
5371 #endif /* defined(_WIN32) */
5372
5373
5374 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5375
5376       if (strcmp(argv[argc_pos], "--help") == 0)
5377       {
5378          usage(argv[0]);
5379       }
5380
5381       else if (strcmp(argv[argc_pos], "--version") == 0)
5382       {
5383          printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
5384          exit(0);
5385       }
5386
5387 #if defined(unix)
5388
5389       else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
5390       {
5391          set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
5392          daemon_mode = 0;
5393       }
5394
5395       else if (strcmp(argv[argc_pos], "--pidfile") == 0)
5396       {
5397          if (++argc_pos == argc) usage(argv[0]);
5398          pidfile = strdup_or_die(argv[argc_pos]);
5399       }
5400
5401       else if (strcmp(argv[argc_pos], "--user") == 0)
5402       {
5403          char *user_arg;
5404          char *group_name;
5405
5406          if (++argc_pos == argc) usage(argv[argc_pos]);
5407
5408          user_arg = strdup_or_die(argv[argc_pos]);
5409          group_name = strchr(user_arg, '.');
5410          if (NULL != group_name)
5411          {
5412             /* Nul-terminate the user name */
5413             *group_name = '\0';
5414
5415             /* Skip the former delimiter to actually reach the group name */
5416             group_name++;
5417
5418             grp = getgrnam(group_name);
5419             if (NULL == grp)
5420             {
5421                log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
5422             }
5423          }
5424          pw = getpwnam(user_arg);
5425          if (NULL == pw)
5426          {
5427             log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
5428          }
5429
5430          freez(user_arg);
5431       }
5432
5433       else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
5434       {
5435          if (++argc_pos == argc) usage(argv[0]);
5436          pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
5437       }
5438
5439       else if (strcmp(argv[argc_pos], "--chroot") == 0)
5440       {
5441          do_chroot = 1;
5442       }
5443 #endif /* defined(unix) */
5444
5445       else if (strcmp(argv[argc_pos], "--config-test") == 0)
5446       {
5447          do_config_test = 1;
5448       }
5449 #ifdef FUZZ
5450       else if (strcmp(argv[argc_pos], "--fuzz") == 0)
5451       {
5452          argc_pos++;
5453          if (argc < argc_pos + 2) usage(argv[0]);
5454          fuzz_input_type = argv[argc_pos];
5455          argc_pos++;
5456          fuzz_input_file = argv[argc_pos];
5457       }
5458       else if (strcmp(argv[argc_pos], "--stfu") == 0)
5459       {
5460          set_debug_level(LOG_LEVEL_STFU);
5461       }
5462 #endif
5463       else if (argc_pos + 1 != argc)
5464       {
5465          /*
5466           * This is neither the last command line
5467           * option, nor was it recognized before,
5468           * therefore it must be invalid.
5469           */
5470          usage(argv[0]);
5471       }
5472       else
5473
5474 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
5475       {
5476          configfile = argv[argc_pos];
5477       }
5478
5479    } /* -END- while (more arguments) */
5480
5481    show_version(Argv[0]);
5482
5483 #if defined(unix)
5484    if (*configfile != '/')
5485    {
5486       char cwd[BUFFER_SIZE];
5487       char *abs_file;
5488       size_t abs_file_size;
5489
5490       /* make config-filename absolute here */
5491       if (NULL == getcwd(cwd, sizeof(cwd)))
5492       {
5493          perror("failed to get current working directory");
5494          exit(1);
5495       }
5496
5497       basedir = strdup_or_die(cwd);
5498       /* XXX: why + 5? */
5499       abs_file_size = strlen(cwd) + strlen(configfile) + 5;
5500       abs_file = malloc_or_die(abs_file_size);
5501       strlcpy(abs_file, basedir, abs_file_size);
5502       strlcat(abs_file, "/", abs_file_size);
5503       strlcat(abs_file, configfile, abs_file_size);
5504       configfile = abs_file;
5505    }
5506 #endif /* defined unix */
5507
5508
5509    files->next = NULL;
5510    clients->next = NULL;
5511
5512    /* XXX: factor out initialising after the next stable release. */
5513 #ifdef _WIN32
5514    InitWin32();
5515 #endif
5516
5517 #ifndef HAVE_ARC4RANDOM
5518    random_seed = (unsigned int)time(NULL);
5519 #ifdef HAVE_RANDOM
5520    srandom(random_seed);
5521 #else
5522    srand(random_seed);
5523 #endif /* ifdef HAVE_RANDOM */
5524 #endif /* ifndef HAVE_ARC4RANDOM */
5525
5526    /*
5527     * Unix signal handling
5528     *
5529     * Catch the abort, interrupt and terminate signals for a graceful exit
5530     * Catch the hangup signal so the errlog can be reopened.
5531     *
5532     * Ignore the broken pipe signal as connection failures
5533     * are handled when and where they occur without relying
5534     * on a signal.
5535     */
5536 #if !defined(_WIN32)
5537 {
5538    int idx;
5539    const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
5540
5541    for (idx = 0; idx < SZ(catched_signals); idx++)
5542    {
5543 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
5544       if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
5545 #else
5546       if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
5547 #endif /* ifdef sun */
5548       {
5549          log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
5550       }
5551    }
5552
5553    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
5554    {
5555       log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
5556    }
5557
5558 }
5559 #else /* ifdef _WIN32 */
5560 # ifdef _WIN_CONSOLE
5561    /*
5562     * We *are* in a windows console app.
5563     * Print a verbose messages about FAQ's and such
5564     */
5565    printf("%s", win32_blurb);
5566 # endif /* def _WIN_CONSOLE */
5567 #endif /* def _WIN32 */
5568
5569 #ifdef FUZZ
5570    if (fuzz_input_type != NULL)
5571    {
5572       exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
5573    }
5574    log_error(LOG_LEVEL_FATAL,
5575       "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
5576       "Various data structures are static which is unsafe when using threads.");
5577 #endif
5578
5579    if (do_config_test)
5580    {
5581       exit(NULL == load_config());
5582    }
5583
5584    /* Initialize the CGI subsystem */
5585    cgi_init_error_messages();
5586
5587    /*
5588     * If running on unix and without the --no-daemon
5589     * option, become a daemon. I.e. fork, detach
5590     * from tty and get process group leadership
5591     */
5592 #if defined(unix)
5593 {
5594    if (daemon_mode)
5595    {
5596       int fd;
5597       pid_t pid = fork();
5598
5599       if (pid < 0) /* error */
5600       {
5601          perror("fork");
5602          exit(3);
5603       }
5604       else if (pid != 0) /* parent */
5605       {
5606          int status;
5607          pid_t wpid;
5608          /*
5609           * must check for errors
5610           * child died due to missing files aso
5611           */
5612          sleep(1);
5613          wpid = waitpid(pid, &status, WNOHANG);
5614          if (wpid != 0)
5615          {
5616             exit(1);
5617          }
5618          exit(0);
5619       }
5620       /* child */
5621
5622       setsid();
5623
5624       /*
5625        * stderr (fd 2) will be closed later on,
5626        * when the config file has been parsed.
5627        */
5628       close(0);
5629       close(1);
5630
5631       /*
5632        * Reserve fd 0 and 1 to prevent abort() and friends
5633        * from sending stuff to the clients or servers.
5634        */
5635       fd = open("/dev/null", O_RDONLY);
5636       if (fd == -1)
5637       {
5638          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5639       }
5640       else if (fd != 0)
5641       {
5642          if (dup2(fd, 0) == -1)
5643          {
5644             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
5645          }
5646          close(fd);
5647       }
5648       fd = open("/dev/null", O_WRONLY);
5649       if (fd == -1)
5650       {
5651          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5652       }
5653       else if (fd != 1)
5654       {
5655          if (dup2(fd, 1) == -1)
5656          {
5657             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
5658          }
5659          close(fd);
5660       }
5661
5662 #ifdef FEATURE_EXTERNAL_FILTERS
5663       for (fd = 0; fd < 3; fd++)
5664       {
5665          mark_socket_for_close_on_execute(fd);
5666       }
5667 #endif
5668
5669       if (chdir("/") != 0)
5670       {
5671          log_error(LOG_LEVEL_FATAL, "Failed to cd into '/': %E");
5672       }
5673
5674    } /* -END- if (daemon_mode) */
5675
5676    /*
5677     * As soon as we have written the PID file, we can switch
5678     * to the user and group ID indicated by the --user option
5679     */
5680    if (pidfile != NULL)
5681    {
5682       write_pid_file(pidfile);
5683    }
5684    if (NULL != pw)
5685    {
5686       if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
5687       {
5688          log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
5689       }
5690       if (NULL != grp)
5691       {
5692          if (setgroups(1, &grp->gr_gid))
5693          {
5694             log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
5695          }
5696       }
5697       else if (initgroups(pw->pw_name, pw->pw_gid))
5698       {
5699          log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
5700       }
5701       if (do_chroot)
5702       {
5703          if (!pw->pw_dir)
5704          {
5705             log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5706          }
5707          /* Read the time zone file from /etc before doing chroot. */
5708          tzset();
5709          if (NULL != pre_chroot_nslookup_to_load_resolver
5710              && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5711          {
5712             /* Initialize resolver library. */
5713             (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5714          }
5715          if (chroot(pw->pw_dir) < 0)
5716          {
5717             log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5718          }
5719          if (chdir ("/"))
5720          {
5721             log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5722          }
5723       }
5724       if (setuid(pw->pw_uid))
5725       {
5726          log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5727       }
5728       if (do_chroot)
5729       {
5730          char putenv_dummy[64];
5731
5732          strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5733          if (putenv(putenv_dummy) != 0)
5734          {
5735             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5736          }
5737
5738          snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5739          if (putenv(putenv_dummy) != 0)
5740          {
5741             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5742          }
5743       }
5744    }
5745    else if (do_chroot)
5746    {
5747       log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5748    }
5749 }
5750 #endif /* defined unix */
5751
5752 #ifdef _WIN32
5753    /* This will be FALSE unless the command line specified --service
5754     */
5755    if (bRunAsService)
5756    {
5757       /* Yup, so now we must attempt to establish a connection
5758        * with the service dispatcher. This will only work if this
5759        * process was launched by the service control manager to
5760        * actually run as a service. If this isn't the case, i've
5761        * known it take around 30 seconds or so for the call to return.
5762        */
5763
5764       /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5765       if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5766       {
5767          /* Service has run, and at this point is now being stopped, so just return */
5768          return 0;
5769       }
5770
5771 #ifdef _WIN_CONSOLE
5772       printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
5773 #endif
5774       /* An error occurred. Usually it's because --service was wrongly specified
5775        * and we were unable to connect to the Service Control Dispatcher because
5776        * it wasn't expecting us and is therefore not listening.
5777        *
5778        * For now, just continue below to call the listen_loop function.
5779        */
5780    }
5781 #endif /* def _WIN32 */
5782
5783    listen_loop();
5784
5785    /* NOTREACHED */
5786    return(-1);
5787
5788 }
5789
5790
5791 /*********************************************************************
5792  *
5793  * Function    :  bind_port_helper
5794  *
5795  * Description :  Bind the listen port.  Handles logging, and aborts
5796  *                on failure.
5797  *
5798  * Parameters  :
5799  *          1  :  haddr = Host address to bind to. Use NULL to bind to
5800  *                        INADDR_ANY.
5801  *          2  :  hport = Specifies port to bind to.
5802  *          3  :  backlog = Listen backlog.
5803  *
5804  * Returns     :  Port that was opened.
5805  *
5806  *********************************************************************/
5807 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
5808 {
5809    int result;
5810    jb_socket bfd;
5811
5812    result = bind_port(haddr, hport, backlog, &bfd);
5813
5814    if (result < 0)
5815    {
5816       const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
5817       switch(result)
5818       {
5819          case -3:
5820             log_error(LOG_LEVEL_FATAL,
5821                "can't bind to %s:%d: There may be another Privoxy "
5822                "or some other proxy running on port %d",
5823                bind_address, hport, hport);
5824
5825          case -2:
5826             log_error(LOG_LEVEL_FATAL,
5827                "can't bind to %s:%d: The hostname is not resolvable",
5828                bind_address, hport);
5829
5830          default:
5831             log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
5832                bind_address, hport);
5833       }
5834
5835       /* shouldn't get here */
5836       return JB_INVALID_SOCKET;
5837    }
5838
5839 #ifndef HAVE_POLL
5840 #ifndef _WIN32
5841    if (bfd >= FD_SETSIZE)
5842    {
5843       log_error(LOG_LEVEL_FATAL,
5844          "Bind socket number too high to use select(): %d >= %d",
5845          bfd, FD_SETSIZE);
5846    }
5847 #endif
5848 #endif
5849
5850    if (haddr == NULL)
5851    {
5852       log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
5853          hport);
5854    }
5855    else
5856    {
5857       log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
5858          hport, haddr);
5859    }
5860
5861    return bfd;
5862 }
5863
5864
5865 /*********************************************************************
5866  *
5867  * Function    :  bind_ports_helper
5868  *
5869  * Description :  Bind the listen ports.  Handles logging, and aborts
5870  *                on failure.
5871  *
5872  * Parameters  :
5873  *          1  :  config = Privoxy configuration.  Specifies ports
5874  *                         to bind to.
5875  *          2  :  sockets = Preallocated array of opened sockets
5876  *                          corresponding to specification in config.
5877  *                          All non-opened sockets will be set to
5878  *                          JB_INVALID_SOCKET.
5879  *
5880  * Returns     :  Nothing. Inspect sockets argument.
5881  *
5882  *********************************************************************/
5883 static void bind_ports_helper(struct configuration_spec * config,
5884                               jb_socket sockets[])
5885 {
5886    int i;
5887
5888    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5889    {
5890       if (config->hport[i])
5891       {
5892          sockets[i] = bind_port_helper(config->haddr[i],
5893             config->hport[i], config->listen_backlog);
5894 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
5895          if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
5896          {
5897             struct accept_filter_arg af_options;
5898             bzero(&af_options, sizeof(af_options));
5899             strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
5900             if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
5901                   sizeof(af_options)))
5902             {
5903                log_error(LOG_LEVEL_ERROR,
5904                   "Enabling accept filter for socket %d failed: %E", sockets[i]);
5905             }
5906          }
5907 #endif
5908       }
5909       else
5910       {
5911          sockets[i] = JB_INVALID_SOCKET;
5912       }
5913    }
5914    config->need_bind = 0;
5915 }
5916
5917
5918 /*********************************************************************
5919  *
5920  * Function    :  close_ports_helper
5921  *
5922  * Description :  Close listenings ports.
5923  *
5924  * Parameters  :
5925  *          1  :  sockets = Array of opened and non-opened sockets to
5926  *                          close. All sockets will be set to
5927  *                          JB_INVALID_SOCKET.
5928  *
5929  * Returns     :  Nothing.
5930  *
5931  *********************************************************************/
5932 static void close_ports_helper(jb_socket sockets[])
5933 {
5934    int i;
5935
5936    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5937    {
5938       if (JB_INVALID_SOCKET != sockets[i])
5939       {
5940          close_socket(sockets[i]);
5941       }
5942       sockets[i] = JB_INVALID_SOCKET;
5943    }
5944 }
5945
5946
5947 #ifdef _WIN32
5948 /* Without this simple workaround we get this compiler warning from _beginthread
5949  *     warning C4028: formal parameter 1 different from declaration
5950  */
5951 void w32_service_listen_loop(void *p)
5952 {
5953    listen_loop();
5954 }
5955 #endif /* def _WIN32 */
5956
5957
5958 /*********************************************************************
5959  *
5960  * Function    :  listen_loop
5961  *
5962  * Description :  bind the listen port and enter a "FOREVER" listening loop.
5963  *
5964  * Parameters  :  N/A
5965  *
5966  * Returns     :  Never.
5967  *
5968  *********************************************************************/
5969 static void listen_loop(void)
5970 {
5971    struct client_states *csp_list = NULL;
5972    struct client_state *csp = NULL;
5973    jb_socket bfds[MAX_LISTENING_SOCKETS];
5974    struct configuration_spec *config;
5975    unsigned int active_threads = 0;
5976 #if defined(FEATURE_PTHREAD)
5977    pthread_attr_t attrs;
5978
5979    pthread_attr_init(&attrs);
5980    pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
5981 #endif
5982
5983    config = load_config();
5984
5985 #ifdef FEATURE_CONNECTION_SHARING
5986    /*
5987     * XXX: Should be relocated once it no
5988     * longer needs to emit log messages.
5989     */
5990    initialize_reusable_connections();
5991 #endif /* def FEATURE_CONNECTION_SHARING */
5992
5993    bind_ports_helper(config, bfds);
5994
5995 #ifdef FEATURE_GRACEFUL_TERMINATION
5996    while (!g_terminate)
5997 #else
5998    for (;;)
5999 #endif
6000    {
6001 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__)
6002       while (waitpid(-1, NULL, WNOHANG) > 0)
6003       {
6004          /* zombie children */
6005       }
6006 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
6007
6008       /*
6009        * Free data that was used by died threads
6010        */
6011       active_threads = sweep();
6012
6013 #if defined(unix)
6014       /*
6015        * Re-open the errlog after HUP signal
6016        */
6017       if (received_hup_signal)
6018       {
6019          if (NULL != config->logfile)
6020          {
6021             init_error_log(Argv[0], config->logfile);
6022          }
6023          received_hup_signal = 0;
6024       }
6025 #endif
6026
6027       csp_list = zalloc_or_die(sizeof(*csp_list));
6028       csp = &csp_list->csp;
6029
6030       log_error(LOG_LEVEL_CONNECT,
6031          "Waiting for the next client connection. Currently active threads: %u",
6032          active_threads);
6033
6034       /*
6035        * This config may be outdated, but for accept_connection()
6036        * it's fresh enough.
6037        */
6038       csp->config = config;
6039
6040       if (!accept_connection(csp, bfds))
6041       {
6042          log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
6043          freez(csp_list);
6044          continue;
6045       }
6046
6047       csp->flags |= CSP_FLAG_ACTIVE;
6048       csp->server_connection.sfd = JB_INVALID_SOCKET;
6049
6050       csp->config = config = load_config();
6051
6052       if (config->need_bind)
6053       {
6054          /*
6055           * Since we were listening to the "old port", we will not see
6056           * a "listen" param change until the next request.  So, at
6057           * least 1 more request must be made for us to find the new
6058           * setting.  I am simply closing the old socket and binding the
6059           * new one.
6060           *
6061           * Which-ever is correct, we will serve 1 more page via the
6062           * old settings.  This should probably be a "show-status"
6063           * request.  This should not be a so common of an operation
6064           * that this will hurt people's feelings.
6065           */
6066
6067          close_ports_helper(bfds);
6068
6069          bind_ports_helper(config, bfds);
6070       }
6071
6072 #ifdef FEATURE_TOGGLE
6073       if (global_toggle_state)
6074 #endif /* def FEATURE_TOGGLE */
6075       {
6076          csp->flags |= CSP_FLAG_TOGGLED_ON;
6077       }
6078
6079       if (run_loader(csp))
6080       {
6081          log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
6082          /* Never get here - LOG_LEVEL_FATAL causes program exit */
6083       }
6084
6085 #ifdef FEATURE_ACL
6086       if (block_acl(NULL,csp))
6087       {
6088          log_error(LOG_LEVEL_CONNECT,
6089             "Connection from %s on %s (socket %d) dropped due to ACL",
6090             csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
6091          close_socket(csp->cfd);
6092          freez(csp->ip_addr_str);
6093          freez(csp->listen_addr_str);
6094          freez(csp_list);
6095          continue;
6096       }
6097 #endif /* def FEATURE_ACL */
6098
6099       if ((0 != config->max_client_connections)
6100          && (active_threads >= config->max_client_connections))
6101       {
6102          log_error(LOG_LEVEL_CONNECT,
6103             "Rejecting connection from %s. Maximum number of connections reached.",
6104             csp->ip_addr_str);
6105          write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6106             strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6107          close_socket(csp->cfd);
6108          freez(csp->ip_addr_str);
6109          freez(csp->listen_addr_str);
6110          freez(csp_list);
6111          continue;
6112       }
6113
6114       /* add it to the list of clients */
6115       csp_list->next = clients->next;
6116       clients->next = csp_list;
6117
6118       if (config->multi_threaded)
6119       {
6120          int child_id;
6121
6122 /* this is a switch () statement in the C preprocessor - ugh */
6123 #undef SELECTED_ONE_OPTION
6124
6125 /* Use Pthreads in preference to native code */
6126 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
6127 #define SELECTED_ONE_OPTION
6128          {
6129             pthread_t the_thread;
6130             int ret;
6131
6132             ret = pthread_create(&the_thread, &attrs,
6133                (void * (*)(void *))serve, csp);
6134             child_id = ret ? -1 : 0;
6135          }
6136 #endif
6137
6138 #if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
6139 #define SELECTED_ONE_OPTION
6140          child_id = _beginthread(
6141             (void (*)(void *))serve,
6142             64 * 1024,
6143             csp);
6144 #endif
6145
6146 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
6147 #define SELECTED_ONE_OPTION
6148          {
6149             thread_id tid = spawn_thread
6150                (server_thread, "server", B_NORMAL_PRIORITY, csp);
6151
6152             if ((tid >= 0) && (resume_thread(tid) == B_OK))
6153             {
6154                child_id = (int) tid;
6155             }
6156             else
6157             {
6158                child_id = -1;
6159             }
6160          }
6161 #endif
6162
6163 #if !defined(SELECTED_ONE_OPTION)
6164          child_id = fork();
6165
6166          /* This block is only needed when using fork().
6167           * When using threads, the server thread was
6168           * created and run by the call to _beginthread().
6169           */
6170          if (child_id == 0)   /* child */
6171          {
6172             int rc = 0;
6173 #ifdef FEATURE_TOGGLE
6174             int inherited_toggle_state = global_toggle_state;
6175 #endif /* def FEATURE_TOGGLE */
6176
6177             serve(csp);
6178
6179             /*
6180              * If we've been toggled or we've blocked the request, tell Mom
6181              */
6182
6183 #ifdef FEATURE_TOGGLE
6184             if (inherited_toggle_state != global_toggle_state)
6185             {
6186                rc |= RC_FLAG_TOGGLED;
6187             }
6188 #endif /* def FEATURE_TOGGLE */
6189
6190 #ifdef FEATURE_STATISTICS
6191             if (csp->flags & CSP_FLAG_REJECTED)
6192             {
6193                rc |= RC_FLAG_BLOCKED;
6194             }
6195 #endif /* ndef FEATURE_STATISTICS */
6196
6197             _exit(rc);
6198          }
6199          else if (child_id > 0) /* parent */
6200          {
6201             /* in a fork()'d environment, the parent's
6202              * copy of the client socket and the CSP
6203              * are not used.
6204              */
6205             int child_status;
6206 #if !defined(_WIN32) && !defined(__CYGWIN__)
6207
6208             wait(&child_status);
6209
6210             /*
6211              * Evaluate child's return code: If the child has
6212              *  - been toggled, toggle ourselves
6213              *  - blocked its request, bump up the stats counter
6214              */
6215
6216 #ifdef FEATURE_TOGGLE
6217             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
6218             {
6219                global_toggle_state = !global_toggle_state;
6220             }
6221 #endif /* def FEATURE_TOGGLE */
6222
6223 #ifdef FEATURE_STATISTICS
6224             urls_read++;
6225             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
6226             {
6227                urls_rejected++;
6228             }
6229 #endif /* def FEATURE_STATISTICS */
6230
6231 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
6232             close_socket(csp->cfd);
6233             csp->flags &= ~CSP_FLAG_ACTIVE;
6234          }
6235 #endif
6236
6237 #undef SELECTED_ONE_OPTION
6238 /* end of cpp switch () */
6239
6240          if (child_id < 0)
6241          {
6242             /*
6243              * Spawning the child failed, assume it's because
6244              * there are too many children running already.
6245              * XXX: If you assume ...
6246              */
6247             log_error(LOG_LEVEL_ERROR,
6248                "Unable to take any additional connections: %E. Active threads: %u",
6249                active_threads);
6250             write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6251                strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6252             close_socket(csp->cfd);
6253             csp->flags &= ~CSP_FLAG_ACTIVE;
6254          }
6255       }
6256       else
6257       {
6258          serve(csp);
6259       }
6260    }
6261
6262 #if defined(FEATURE_PTHREAD)
6263    pthread_attr_destroy(&attrs);
6264 #endif
6265
6266    /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
6267
6268 #ifdef FEATURE_GRACEFUL_TERMINATION
6269
6270    log_error(LOG_LEVEL_INFO, "Graceful termination requested.");
6271
6272    unload_current_config_file();
6273    unload_current_actions_file();
6274    unload_current_re_filterfile();
6275 #ifdef FEATURE_TRUST
6276    unload_current_trust_file();
6277 #endif
6278
6279    if (config->multi_threaded)
6280    {
6281       int i = 60;
6282       do
6283       {
6284          sleep(1);
6285          sweep();
6286       } while ((clients->next != NULL) && (--i > 0));
6287
6288       if (i <= 0)
6289       {
6290          log_error(LOG_LEVEL_ERROR, "Graceful termination failed "
6291             "- still some live clients after 1 minute wait.");
6292       }
6293    }
6294    sweep();
6295    sweep();
6296
6297 #if defined(unix)
6298    freez(basedir);
6299 #endif
6300
6301 #ifdef FEATURE_HTTPS_INSPECTION
6302    /*
6303     * Only release TLS backed resources if there
6304     * are no active connections left.
6305     */
6306    if (clients->next == NULL)
6307    {
6308       ssl_release();
6309    }
6310 #endif
6311
6312    log_error(LOG_LEVEL_INFO, "Exiting gracefully.");
6313
6314 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
6315    /* Cleanup - remove taskbar icon etc. */
6316    TermLogWindow();
6317 #endif
6318
6319    exit(0);
6320 #endif /* FEATURE_GRACEFUL_TERMINATION */
6321
6322 }
6323
6324
6325 /*
6326   Local Variables:
6327   tab-width: 3
6328   end:
6329 */