receive_and_send_encrypted_post_data(): Additionally check for data being available
[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) 2001-2022 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 #ifdef MUTEX_LOCKS_AVAILABLE
131 unsigned long long number_of_requests_received = 0;
132 unsigned long long number_of_requests_blocked = 0;
133 #endif
134 #endif /* def FEATURE_STATISTICS */
135
136 #ifdef FEATURE_GRACEFUL_TERMINATION
137 int g_terminate = 0;
138 #endif
139
140 #if !defined(_WIN32)
141 static void sig_handler(int the_signal);
142 #endif
143 static int client_protocol_is_unsupported(struct client_state *csp, char *req);
144 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers);
145 static jb_err get_server_headers(struct client_state *csp);
146 static const char *crunch_reason(const struct http_response *rsp);
147 static void send_crunch_response(struct client_state *csp, struct http_response *rsp);
148 static char *get_request_line(struct client_state *csp);
149 static jb_err receive_client_request(struct client_state *csp);
150 static jb_err parse_client_request(struct client_state *csp);
151 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line);
152 static jb_err change_request_destination(struct client_state *csp);
153 static void handle_established_connection(struct client_state *csp);
154 static void chat(struct client_state *csp);
155 static void serve(struct client_state *csp);
156 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
157 static void usage(const char *myname);
158 #endif
159 static void initialize_mutexes(void);
160 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog);
161 static void bind_ports_helper(struct configuration_spec *config, jb_socket sockets[]);
162 static void close_ports_helper(jb_socket sockets[]);
163 static void listen_loop(void);
164 static void serve(struct client_state *csp);
165
166 #ifdef __BEOS__
167 static int32 server_thread(void *data);
168 #endif /* def __BEOS__ */
169
170 #ifdef _WIN32
171 #define sleep(N)  Sleep(((N) * 1000))
172 #endif
173
174 #ifdef FUZZ
175 int process_fuzzed_input(char *fuzz_input_type, char *fuzz_input_file);
176 void show_fuzz_usage(const char *name);
177 #endif
178
179 #ifdef MUTEX_LOCKS_AVAILABLE
180 /*
181  * XXX: Does the locking stuff really belong in this file?
182  */
183 privoxy_mutex_t log_mutex;
184 privoxy_mutex_t log_init_mutex;
185 privoxy_mutex_t connection_reuse_mutex;
186
187 #ifdef FEATURE_HTTPS_INSPECTION
188 privoxy_mutex_t certificate_mutex;
189 privoxy_mutex_t ssl_init_mutex;
190 #endif
191
192 #ifdef FEATURE_EXTERNAL_FILTERS
193 privoxy_mutex_t external_filter_mutex;
194 #endif
195 #ifdef FEATURE_CLIENT_TAGS
196 privoxy_mutex_t client_tags_mutex;
197 #endif
198 #ifdef FEATURE_STATISTICS
199 privoxy_mutex_t block_statistics_mutex;
200 #endif
201 #ifdef FEATURE_EXTENDED_STATISTICS
202 privoxy_mutex_t filter_statistics_mutex;
203 privoxy_mutex_t block_reason_statistics_mutex;
204 #endif
205
206 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
207 privoxy_mutex_t resolver_mutex;
208 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
209
210 #ifndef HAVE_GMTIME_R
211 privoxy_mutex_t gmtime_mutex;
212 #endif /* ndef HAVE_GMTIME_R */
213
214 #ifndef HAVE_LOCALTIME_R
215 privoxy_mutex_t localtime_mutex;
216 #endif /* ndef HAVE_GMTIME_R */
217
218 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
219 privoxy_mutex_t rand_mutex;
220 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
221
222 #endif /* def MUTEX_LOCKS_AVAILABLE */
223
224 #if defined(unix)
225 const char *basedir = NULL;
226 const char *pidfile = NULL;
227 static int received_hup_signal = 0;
228 #endif /* defined unix */
229
230 /* HTTP snipplets. */
231 static const char CSUCCEED[] =
232    "HTTP/1.1 200 Connection established\r\n\r\n";
233
234 static const char CHEADER[] =
235    "HTTP/1.1 400 Invalid header received from client\r\n"
236    "Content-Type: text/plain\r\n"
237    "Connection: close\r\n\r\n"
238    "Invalid header received from client.\n";
239
240 static const char FTP_RESPONSE[] =
241    "HTTP/1.1 400 Invalid request received from client\r\n"
242    "Content-Type: text/plain\r\n"
243    "Connection: close\r\n\r\n"
244    "Invalid request. Privoxy doesn't support FTP.\n";
245
246 static const char GOPHER_RESPONSE[] =
247    "HTTP/1.1 400 Invalid request received from client\r\n"
248    "Content-Type: text/plain\r\n"
249    "Connection: close\r\n\r\n"
250    "Invalid request. Privoxy doesn't support gopher.\n";
251
252 /* XXX: should be a template */
253 static const char MISSING_DESTINATION_RESPONSE[] =
254    "HTTP/1.1 400 Bad request received from client\r\n"
255    "Content-Type: text/plain\r\n"
256    "Connection: close\r\n\r\n"
257    "Bad request. Privoxy was unable to extract the destination.\n";
258
259 /* XXX: should be a template */
260 static const char INVALID_SERVER_HEADERS_RESPONSE[] =
261    "HTTP/1.1 502 Server or forwarder response invalid\r\n"
262    "Content-Type: text/plain\r\n"
263    "Connection: close\r\n\r\n"
264    "Bad response. The server or forwarder response doesn't look like HTTP.\n";
265
266 /* XXX: should be a template */
267 static const char MESSED_UP_REQUEST_RESPONSE[] =
268    "HTTP/1.1 400 Malformed request after rewriting\r\n"
269    "Content-Type: text/plain\r\n"
270    "Connection: close\r\n\r\n"
271    "Bad request. Messed up with header filters.\n";
272
273 static const char TOO_MANY_CONNECTIONS_RESPONSE[] =
274    "HTTP/1.1 503 Too many open connections\r\n"
275    "Content-Type: text/plain\r\n"
276    "Connection: close\r\n\r\n"
277    "Maximum number of open connections reached.\n";
278
279 static const char CLIENT_CONNECTION_TIMEOUT_RESPONSE[] =
280    "HTTP/1.1 504 Connection timeout\r\n"
281    "Content-Type: text/plain\r\n"
282    "Connection: close\r\n\r\n"
283    "The connection timed out because the client request didn't arrive in time.\n";
284
285 static const char CLIENT_BODY_PARSE_ERROR_RESPONSE[] =
286    "HTTP/1.1 400 Failed reading client body\r\n"
287    "Content-Type: text/plain\r\n"
288    "Connection: close\r\n\r\n"
289    "Failed parsing or buffering the chunk-encoded client body.\n";
290
291 static const char UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE[] =
292    "HTTP/1.1 417 Expecting too much\r\n"
293    "Content-Type: text/plain\r\n"
294    "Connection: close\r\n\r\n"
295    "Privoxy detected an unsupported Expect header value.\n";
296
297 /* A function to crunch a response */
298 typedef struct http_response *(*crunch_func_ptr)(struct client_state *);
299
300 /* Crunch function flags */
301 #define CF_NO_FLAGS        0
302 /* Cruncher applies to forced requests as well */
303 #define CF_IGNORE_FORCE    1
304 /* Crunched requests are counted for the block statistics */
305 #define CF_COUNT_AS_REJECT 2
306
307 /* A crunch function and its flags */
308 struct cruncher
309 {
310    const crunch_func_ptr cruncher;
311    const int flags;
312 };
313
314 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[]);
315
316 /* Complete list of cruncher functions */
317 static const struct cruncher crunchers_all[] = {
318    { direct_response, CF_COUNT_AS_REJECT|CF_IGNORE_FORCE},
319    { block_url,       CF_COUNT_AS_REJECT },
320 #ifdef FEATURE_TRUST
321    { trust_url,       CF_COUNT_AS_REJECT },
322 #endif /* def FEATURE_TRUST */
323    { redirect_url,    CF_NO_FLAGS  },
324    { dispatch_cgi,    CF_IGNORE_FORCE},
325    { NULL,            0 }
326 };
327
328 /* Light version, used after tags are applied */
329 static const struct cruncher crunchers_light[] = {
330    { block_url,       CF_COUNT_AS_REJECT },
331    { redirect_url,    CF_NO_FLAGS },
332    { NULL,            0 }
333 };
334
335
336 /*
337  * XXX: Don't we really mean
338  *
339  * #if defined(unix)
340  *
341  * here?
342  */
343 #if !defined(_WIN32)
344 /*********************************************************************
345  *
346  * Function    :  sig_handler
347  *
348  * Description :  Signal handler for different signals.
349  *                Exit gracefully on TERM and INT
350  *                or set a flag that will cause the errlog
351  *                to be reopened by the main thread on HUP.
352  *
353  * Parameters  :
354  *          1  :  the_signal = the signal cause this function to call
355  *
356  * Returns     :  -
357  *
358  *********************************************************************/
359 static void sig_handler(int the_signal)
360 {
361    switch(the_signal)
362    {
363       case SIGTERM:
364       case SIGINT:
365          log_error(LOG_LEVEL_INFO, "exiting by signal %d .. bye", the_signal);
366 #if defined(unix)
367          if (pidfile)
368          {
369             unlink(pidfile);
370          }
371 #endif /* unix */
372          exit(the_signal);
373          break;
374
375       case SIGHUP:
376 #if defined(unix)
377          received_hup_signal = 1;
378 #endif
379          break;
380
381       default:
382          /*
383           * We shouldn't be here, unless we catch signals
384           * in main() that we can't handle here!
385           */
386          log_error(LOG_LEVEL_FATAL,
387             "sig_handler: exiting on unexpected signal %d", the_signal);
388    }
389    return;
390
391 }
392 #endif
393
394
395 /*********************************************************************
396  *
397  * Function    :  get_write_delay
398  *
399  * Description :  Parse the delay-response parameter.
400  *
401  * Parameters  :
402  *          1  :  csp = Current client state (buffers, headers, etc...)
403  *
404  * Returns     :  Number of milliseconds to delay writes.
405  *
406  *********************************************************************/
407 static unsigned int get_write_delay(const struct client_state *csp)
408 {
409    unsigned int delay;
410    char *endptr;
411    char *newval;
412
413    if ((csp->action->flags & ACTION_DELAY_RESPONSE) == 0)
414    {
415       return 0;
416    }
417    newval = csp->action->string[ACTION_STRING_DELAY_RESPONSE];
418
419    delay = (unsigned)strtol(newval, &endptr, 0);
420    if (*endptr != '\0')
421    {
422       log_error(LOG_LEVEL_FATAL,
423          "Invalid delay-response{} parameter: '%s'", newval);
424    }
425
426    return delay;
427
428 }
429
430
431 /*********************************************************************
432  *
433  * Function    :  client_protocol_is_unsupported
434  *
435  * Description :  Checks if the client used a known unsupported
436  *                protocol and deals with it by sending an error
437  *                response.
438  *
439  * Parameters  :
440  *          1  :  csp = Current client state (buffers, headers, etc...)
441  *          2  :  req = the first request line send by the client
442  *
443  * Returns     :  TRUE if an error response has been generated, or
444  *                FALSE if the request doesn't look invalid.
445  *
446  *********************************************************************/
447 static int client_protocol_is_unsupported(struct client_state *csp, char *req)
448 {
449    /*
450     * If it's a FTP or gopher request, we don't support it.
451     *
452     * These checks are better than nothing, but they might
453     * not work in all configurations and some clients might
454     * have problems digesting the answer.
455     *
456     * They should, however, never cause more problems than
457     * Privoxy's old behaviour (returning the misleading HTML
458     * error message:
459     *
460     * "Could not resolve http://(ftp|gopher)://example.org").
461     */
462    if (!strncmpic(req, "GET ftp://", 10) || !strncmpic(req, "GET gopher://", 13))
463    {
464       const char *response = NULL;
465       const char *protocol = NULL;
466
467       if (!strncmpic(req, "GET ftp://", 10))
468       {
469          response = FTP_RESPONSE;
470          protocol = "FTP";
471       }
472       else
473       {
474          response = GOPHER_RESPONSE;
475          protocol = "GOPHER";
476       }
477       log_error(LOG_LEVEL_ERROR,
478          "%s tried to use Privoxy as %s proxy: %s",
479          csp->ip_addr_str, protocol, req);
480       log_error(LOG_LEVEL_CLF,
481          "%s - - [%T] \"%s\" 400 0", csp->ip_addr_str, req);
482       freez(req);
483
484 #ifdef FEATURE_HTTPS_INSPECTION
485       if (client_use_ssl(csp))
486       {
487          ssl_send_data_delayed(&(csp->ssl_client_attr),
488             (const unsigned char *)response, strlen(response),
489             get_write_delay(csp));
490       }
491       else
492 #endif
493       {
494          write_socket_delayed(csp->cfd, response, strlen(response),
495             get_write_delay(csp));
496       }
497
498       return TRUE;
499    }
500
501    return FALSE;
502 }
503
504
505 /*********************************************************************
506  *
507  * Function    :  client_has_unsupported_expectations
508  *
509  * Description :  Checks if the client used an unsupported expectation
510  *                in which case an error message is delivered.
511  *
512  * Parameters  :
513  *          1  :  csp = Current client state (buffers, headers, etc...)
514  *
515  * Returns     :  TRUE if an error response has been generated, or
516  *                FALSE if the request doesn't look invalid.
517  *
518  *********************************************************************/
519 static int client_has_unsupported_expectations(const struct client_state *csp)
520 {
521    if ((csp->flags & CSP_FLAG_UNSUPPORTED_CLIENT_EXPECTATION))
522    {
523       log_error(LOG_LEVEL_ERROR,
524          "Rejecting request from client %s with unsupported Expect header value",
525          csp->ip_addr_str);
526       log_error(LOG_LEVEL_CLF,
527          "%s - - [%T] \"%s\" 417 0", csp->ip_addr_str, csp->http->cmd);
528       write_socket_delayed(csp->cfd,
529          UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE,
530          strlen(UNSUPPORTED_CLIENT_EXPECTATION_ERROR_RESPONSE),
531          get_write_delay(csp));
532
533       return TRUE;
534    }
535
536    return FALSE;
537
538 }
539
540
541 /*********************************************************************
542  *
543  * Function    :  get_request_destination_elsewhere
544  *
545  * Description :  If the client's request was redirected into
546  *                Privoxy without the client's knowledge,
547  *                the request line lacks the destination host.
548  *
549  *                This function tries to get it elsewhere,
550  *                provided accept-intercepted-requests is enabled.
551  *
552  *                "Elsewhere" currently only means "Host: header",
553  *                but in the future we may ask the redirecting
554  *                packet filter to look the destination up.
555  *
556  *                If the destination stays unknown, an error
557  *                response is send to the client and headers
558  *                are freed so that chat() can return directly.
559  *
560  * Parameters  :
561  *          1  :  csp = Current client state (buffers, headers, etc...)
562  *          2  :  headers = a header list
563  *
564  * Returns     :  JB_ERR_OK if the destination is now known, or
565  *                JB_ERR_PARSE if it isn't.
566  *
567  *********************************************************************/
568 static jb_err get_request_destination_elsewhere(struct client_state *csp, struct list *headers)
569 {
570    if (!(csp->config->feature_flags & RUNTIME_FEATURE_ACCEPT_INTERCEPTED_REQUESTS))
571    {
572       log_error(LOG_LEVEL_ERROR, "%s's request: \'%s\' is invalid."
573          " Privoxy isn't configured to accept intercepted requests.",
574          csp->ip_addr_str, csp->http->cmd);
575       /* XXX: Use correct size */
576       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
577          csp->ip_addr_str, csp->http->cmd);
578
579       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
580          get_write_delay(csp));
581       destroy_list(headers);
582
583       return JB_ERR_PARSE;
584    }
585    else if (JB_ERR_OK == get_destination_from_headers(headers, csp->http))
586    {
587       /* Split the domain we just got for pattern matching */
588       init_domain_components(csp->http);
589
590       return JB_ERR_OK;
591    }
592    else
593    {
594       /* We can't work without destination. Go spread the news.*/
595
596       /* XXX: Use correct size */
597       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
598          csp->ip_addr_str, csp->http->cmd);
599       log_error(LOG_LEVEL_ERROR,
600          "Privoxy was unable to get the destination for %s's request: %s",
601          csp->ip_addr_str, csp->http->cmd);
602
603       write_socket_delayed(csp->cfd, MISSING_DESTINATION_RESPONSE,
604          strlen(MISSING_DESTINATION_RESPONSE), get_write_delay(csp));
605       destroy_list(headers);
606
607       return JB_ERR_PARSE;
608    }
609    /*
610     * TODO: If available, use PF's ioctl DIOCNATLOOK as last resort
611     * to get the destination IP address, use it as host directly
612     * or do a reverse DNS lookup first.
613     */
614 }
615
616
617 /*********************************************************************
618  *
619  * Function    :  get_server_headers
620  *
621  * Description :  Parses server headers in iob and fills them
622  *                into csp->headers so that they can later be
623  *                handled by sed().
624  *
625  * Parameters  :
626  *          1  :  csp = Current client state (buffers, headers, etc...)
627  *
628  * Returns     :  JB_ERR_OK if everything went fine, or
629  *                JB_ERR_PARSE if the headers were incomplete.
630  *
631  *********************************************************************/
632 static jb_err get_server_headers(struct client_state *csp)
633 {
634    int continue_hack_in_da_house = 0;
635    char * header;
636
637    while (((header = get_header(csp->iob)) != NULL) || continue_hack_in_da_house)
638    {
639       if (header == NULL)
640       {
641          /*
642           * continue hack in da house. Ignore the ending of
643           * this head and continue enlisting header lines.
644           * The reason is described below.
645           */
646          enlist(csp->headers, "");
647          continue_hack_in_da_house = 0;
648          continue;
649       }
650       else if (0 == strncmpic(header, "HTTP/1.1 100", 12))
651       {
652          /*
653           * It's a bodyless continue response, don't
654           * stop header parsing after reaching its end.
655           *
656           * As a result Privoxy will concatenate the
657           * next response's head and parse and deliver
658           * the headers as if they belonged to one request.
659           *
660           * The client will separate them because of the
661           * empty line between them.
662           *
663           * XXX: What we're doing here is clearly against
664           * the intended purpose of the continue header,
665           * and under some conditions (HTTP/1.0 client request)
666           * it's a standard violation.
667           *
668           * Anyway, "sort of against the spec" is preferable
669           * to "always getting confused by Continue responses"
670           * (Privoxy's behaviour before this hack was added)
671           */
672          log_error(LOG_LEVEL_HEADER, "Continue hack in da house.");
673          continue_hack_in_da_house = 1;
674       }
675       else if (*header == '\0')
676       {
677          /*
678           * If the header is empty, but the Continue hack
679           * isn't active, we can assume that we reached the
680           * end of the buffer before we hit the end of the
681           * head.
682           *
683           * Inform the caller an let it decide how to handle it.
684           */
685          return JB_ERR_PARSE;
686       }
687
688       if (JB_ERR_MEMORY == enlist(csp->headers, header))
689       {
690          /*
691           * XXX: Should we quit the request and return a
692           * out of memory error page instead?
693           */
694          log_error(LOG_LEVEL_ERROR,
695             "Out of memory while enlisting server headers. %s lost.",
696             header);
697       }
698       freez(header);
699    }
700
701    return JB_ERR_OK;
702 }
703
704
705 /*********************************************************************
706  *
707  * Function    :  crunch_reason
708  *
709  * Description :  Translates the crunch reason code into a string.
710  *
711  * Parameters  :
712  *          1  :  rsp = a http_response
713  *
714  * Returns     :  A string with the crunch reason or an error description.
715  *
716  *********************************************************************/
717 static const char *crunch_reason(const struct http_response *rsp)
718 {
719    char * reason = NULL;
720
721    assert(rsp != NULL);
722    if (rsp == NULL)
723    {
724       return "Internal error while searching for crunch reason";
725    }
726
727    switch (rsp->crunch_reason)
728    {
729       case UNSUPPORTED:
730          reason = "Unsupported HTTP feature";
731          break;
732       case BLOCKED:
733          reason = "Blocked";
734          break;
735       case UNTRUSTED:
736          reason = "Untrusted";
737          break;
738       case REDIRECTED:
739          reason = "Redirected";
740          break;
741       case CGI_CALL:
742          reason = "CGI Call";
743          break;
744       case NO_SUCH_DOMAIN:
745          reason = "DNS failure";
746          break;
747       case FORWARDING_FAILED:
748          reason = "Forwarding failed";
749          break;
750       case CONNECT_FAILED:
751          reason = "Connection failure";
752          break;
753       case OUT_OF_MEMORY:
754          reason = "Out of memory (may mask other reasons)";
755          break;
756       case CONNECTION_TIMEOUT:
757          reason = "Connection timeout";
758          break;
759       case NO_SERVER_DATA:
760          reason = "No server data received";
761          break;
762       default:
763          reason = "No reason recorded";
764          break;
765    }
766
767    return reason;
768 }
769
770
771 /*********************************************************************
772  *
773  * Function    :  log_applied_actions
774  *
775  * Description :  Logs the applied actions if LOG_LEVEL_ACTIONS is
776  *                enabled.
777  *
778  * Parameters  :
779  *          1  :  actions = Current action spec to log
780  *
781  * Returns     :  Nothing.
782  *
783  *********************************************************************/
784 static void log_applied_actions(const struct current_action_spec *actions)
785 {
786    /*
787     * The conversion to text requires lots of memory allocations so
788     * we only do the conversion if the user is actually interested.
789     */
790    if (debug_level_is_enabled(LOG_LEVEL_ACTIONS))
791    {
792       char *actions_as_text = actions_to_line_of_text(actions);
793       log_error(LOG_LEVEL_ACTIONS, "%s", actions_as_text);
794       freez(actions_as_text);
795    }
796 }
797
798
799 /*********************************************************************
800  *
801  * Function    :  send_crunch_response
802  *
803  * Description :  Delivers already prepared response for
804  *                intercepted requests, logs the interception
805  *                and frees the response.
806  *
807  * Parameters  :
808  *          1  :  csp = Current client state (buffers, headers, etc...)
809  *          2  :  rsp = Fully prepared response. Will be freed on exit.
810  *
811  * Returns     :  Nothing.
812  *
813  *********************************************************************/
814 static void send_crunch_response(struct client_state *csp, struct http_response *rsp)
815 {
816       const struct http_request *http = csp->http;
817       char status_code[4];
818
819       assert(rsp != NULL);
820       assert(rsp->head != NULL);
821
822       if (rsp == NULL)
823       {
824          log_error(LOG_LEVEL_FATAL, "NULL response in send_crunch_response.");
825       }
826
827       /*
828        * Extract the status code from the actual head
829        * that will be send to the client. It is the only
830        * way to get it right for all requests, including
831        * the fixed ones for out-of-memory problems.
832        *
833        * A head starts like this: 'HTTP/1.1 200...'
834        *                           0123456789|11
835        *                                     10
836        */
837       status_code[0] = rsp->head[9];
838       status_code[1] = rsp->head[10];
839       status_code[2] = rsp->head[11];
840       status_code[3] = '\0';
841
842       /* Log that the request was crunched and why. */
843       log_applied_actions(csp->action);
844 #ifdef FEATURE_HTTPS_INSPECTION
845       if (client_use_ssl(csp))
846       {
847          log_error(LOG_LEVEL_CRUNCH, "%s: https://%s%s", crunch_reason(rsp),
848             http->hostport, http->path);
849          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" %s %lu",
850             csp->ip_addr_str, http->gpc, http->hostport, http->path,
851             http->version, status_code, rsp->content_length);
852       }
853       else
854 #endif
855       {
856          log_error(LOG_LEVEL_CRUNCH, "%s: %s", crunch_reason(rsp), http->url);
857          log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" %s %lu",
858             csp->ip_addr_str, http->ocmd, status_code, rsp->content_length);
859       }
860       /* Write the answer to the client */
861 #ifdef FEATURE_HTTPS_INSPECTION
862       if (client_use_ssl(csp))
863       {
864          if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
865                 (const unsigned char *)rsp->head, rsp->head_length,
866                 get_write_delay(csp)) < 0)
867           || (ssl_send_data_delayed(&(csp->ssl_client_attr),
868                 (const unsigned char *)rsp->body, rsp->content_length,
869                 get_write_delay(csp)) < 0))
870          {
871             /* There is nothing we can do about it. */
872             log_error(LOG_LEVEL_CONNECT, "Couldn't deliver the error message "
873                "for https://%s%s through client socket %d using TLS/SSL",
874                http->hostport, http->url, csp->cfd);
875          }
876       }
877       else
878 #endif
879       {
880          if (write_socket_delayed(csp->cfd, rsp->head, rsp->head_length,
881                 get_write_delay(csp))
882           || write_socket_delayed(csp->cfd, rsp->body, rsp->content_length,
883                 get_write_delay(csp)))
884          {
885             /* There is nothing we can do about it. */
886             log_error(LOG_LEVEL_CONNECT,
887                "Couldn't deliver the error message for %s through client socket %d: %E",
888                http->url, csp->cfd);
889          }
890       }
891
892       /* Clean up and return */
893       if (cgi_error_memory() != rsp)
894       {
895          free_http_response(rsp);
896       }
897       return;
898 }
899
900
901 /*********************************************************************
902  *
903  * Function    :  crunch_response_triggered
904  *
905  * Description :  Checks if the request has to be crunched,
906  *                and delivers the crunch response if necessary.
907  *
908  * Parameters  :
909  *          1  :  csp = Current client state (buffers, headers, etc...)
910  *          2  :  crunchers = list of cruncher functions to run
911  *
912  * Returns     :  TRUE if the request was answered with a crunch response
913  *                FALSE otherwise.
914  *
915  *********************************************************************/
916 static int crunch_response_triggered(struct client_state *csp, const struct cruncher crunchers[])
917 {
918    struct http_response *rsp = NULL;
919    const struct cruncher *c;
920
921    /*
922     * If CGI request crunching is disabled,
923     * check the CGI dispatcher out of order to
924     * prevent unintentional blocks or redirects.
925     */
926    if (!(csp->config->feature_flags & RUNTIME_FEATURE_CGI_CRUNCHING)
927        && (NULL != (rsp = dispatch_cgi(csp))))
928    {
929       /* Deliver, log and free the interception response. */
930       send_crunch_response(csp, rsp);
931       csp->flags |= CSP_FLAG_CRUNCHED;
932       return TRUE;
933    }
934
935    for (c = crunchers; c->cruncher != NULL; c++)
936    {
937       /*
938        * Check the cruncher if either Privoxy is toggled
939        * on and the request isn't forced, or if the cruncher
940        * applies to forced requests as well.
941        */
942       if (((csp->flags & CSP_FLAG_TOGGLED_ON) &&
943           !(csp->flags & CSP_FLAG_FORCED)) ||
944           (c->flags & CF_IGNORE_FORCE))
945       {
946          rsp = c->cruncher(csp);
947          if (NULL != rsp)
948          {
949             /* Deliver, log and free the interception response. */
950             send_crunch_response(csp, rsp);
951             csp->flags |= CSP_FLAG_CRUNCHED;
952 #ifdef FEATURE_STATISTICS
953             if (c->flags & CF_COUNT_AS_REJECT)
954             {
955 #ifdef MUTEX_LOCKS_AVAILABLE
956                privoxy_mutex_lock(&block_statistics_mutex);
957                number_of_requests_blocked++;
958                privoxy_mutex_unlock(&block_statistics_mutex);
959 #endif
960                csp->flags |= CSP_FLAG_REJECTED;
961             }
962 #endif /* def FEATURE_STATISTICS */
963
964             return TRUE;
965          }
966       }
967    }
968
969    return FALSE;
970 }
971
972
973 /*********************************************************************
974  *
975  * Function    :  build_request_line
976  *
977  * Description :  Builds the HTTP request line.
978  *
979  *                If a HTTP forwarder is used it expects the whole URL,
980  *                web servers only get the path.
981  *
982  * Parameters  :
983  *          1  :  csp = Current client state (buffers, headers, etc...)
984  *          2  :  fwd = The forwarding spec used for the request.
985  *                      Can be NULL.
986  *          3  :  request_line = The old request line which will be replaced.
987  *
988  * Returns     :  Nothing. Terminates in case of memory problems.
989  *
990  *********************************************************************/
991 static void build_request_line(struct client_state *csp, const struct forward_spec *fwd, char **request_line)
992 {
993    struct http_request *http = csp->http;
994
995    /*
996     * Downgrade http version from 1.1 to 1.0
997     * if +downgrade action applies.
998     */
999    if ((csp->action->flags & ACTION_DOWNGRADE)
1000      && (!strcmpic(http->version, "HTTP/1.1")))
1001    {
1002       freez(http->version);
1003       http->version = strdup_or_die("HTTP/1.0");
1004    }
1005
1006    /*
1007     * Rebuild the request line.
1008     */
1009    freez(*request_line);
1010 #ifdef FEATURE_HTTPS_INSPECTION
1011    if (fwd != NULL && fwd->forward_host &&
1012        fwd->type != FORWARD_WEBSERVER && client_use_ssl(csp))
1013    {
1014       *request_line = strdup("CONNECT ");
1015    }
1016    else
1017 #endif
1018    {
1019       *request_line = strdup(http->gpc);
1020       string_append(request_line, " ");
1021    }
1022
1023    if (fwd != NULL && fwd->forward_host && fwd->type != FORWARD_WEBSERVER)
1024    {
1025 #ifdef FEATURE_HTTPS_INSPECTION
1026       if (client_use_ssl(csp))
1027       {
1028          char port_string[10];
1029
1030          string_append(request_line, http->host);
1031          snprintf(port_string, sizeof(port_string), ":%d", http->port);
1032          string_append(request_line, port_string);
1033       }
1034       else
1035 #endif
1036       {
1037          string_append(request_line, http->url);
1038       }
1039    }
1040    else
1041    {
1042       string_append(request_line, http->path);
1043    }
1044    string_append(request_line, " ");
1045    string_append(request_line, http->version);
1046
1047    if (*request_line == NULL)
1048    {
1049       log_error(LOG_LEVEL_FATAL, "Out of memory writing HTTP command");
1050    }
1051    log_error(LOG_LEVEL_HEADER, "New HTTP Request-Line: %s", *request_line);
1052 }
1053
1054
1055 /*********************************************************************
1056  *
1057  * Function    :  change_request_destination
1058  *
1059  * Description :  Parse a (rewritten) request line and regenerate
1060  *                the http request data.
1061  *
1062  * Parameters  :
1063  *          1  :  csp = Current client state (buffers, headers, etc...)
1064  *
1065  * Returns     :  Forwards the parse_http_request() return code.
1066  *                Terminates in case of memory problems.
1067  *
1068  *********************************************************************/
1069 static jb_err change_request_destination(struct client_state *csp)
1070 {
1071    struct http_request *http = csp->http;
1072    jb_err err;
1073
1074    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
1075       csp->headers->first->str);
1076    free_http_request(http);
1077    err = parse_http_request(csp->headers->first->str, http);
1078    if (JB_ERR_OK != err)
1079    {
1080       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
1081          jb_err_to_string(err));
1082    }
1083    if (http->ssl && strcmpic(csp->http->gpc, "CONNECT"))
1084    {
1085       /*
1086        * A client header filter changed the request URL from
1087        * http:// to https:// which we currently don't support.
1088        */
1089       log_error(LOG_LEVEL_ERROR, "Changing the request destination from http "
1090          "to https behind the client's back currently isn't supported.");
1091       return JB_ERR_PARSE;
1092    }
1093
1094    return err;
1095 }
1096
1097
1098 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1099 /*********************************************************************
1100  *
1101  * Function    :  server_response_is_complete
1102  *
1103  * Description :  Determines whether we should stop reading
1104  *                from the server socket.
1105  *
1106  * Parameters  :
1107  *          1  :  csp = Current client state (buffers, headers, etc...)
1108  *          2  :  content_length = Length of content received so far.
1109  *
1110  * Returns     :  TRUE if the response is complete,
1111  *                FALSE otherwise.
1112  *
1113  *********************************************************************/
1114 static int server_response_is_complete(struct client_state *csp,
1115    unsigned long long content_length)
1116 {
1117    int content_length_known = !!(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET);
1118
1119    if (!strcmpic(csp->http->gpc, "HEAD"))
1120    {
1121       /*
1122        * "HEAD" implies no body, we are thus expecting
1123        * no content. XXX: incomplete "list" of methods?
1124        */
1125       csp->expected_content_length = 0;
1126       content_length_known = TRUE;
1127       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1128    }
1129
1130    if (csp->http->status == 204 || csp->http->status == 304)
1131    {
1132       /*
1133        * Expect no body. XXX: incomplete "list" of status codes?
1134        */
1135       csp->expected_content_length = 0;
1136       content_length_known = TRUE;
1137       csp->flags |= CSP_FLAG_SERVER_CONTENT_LENGTH_SET;
1138    }
1139
1140    return (content_length_known && ((0 == csp->expected_content_length)
1141             || (csp->expected_content_length <= content_length)));
1142 }
1143
1144
1145 #ifdef FEATURE_CONNECTION_SHARING
1146 /*********************************************************************
1147  *
1148  * Function    :  wait_for_alive_connections
1149  *
1150  * Description :  Waits for alive connections to timeout.
1151  *
1152  * Parameters  :  N/A
1153  *
1154  * Returns     :  N/A
1155  *
1156  *********************************************************************/
1157 static void wait_for_alive_connections(void)
1158 {
1159    int connections_alive = close_unusable_connections();
1160
1161    while (0 < connections_alive)
1162    {
1163       log_error(LOG_LEVEL_CONNECT,
1164          "Waiting for %d connections to timeout.",
1165          connections_alive);
1166       sleep(60);
1167       connections_alive = close_unusable_connections();
1168    }
1169
1170    log_error(LOG_LEVEL_CONNECT, "No connections to wait for left.");
1171
1172 }
1173 #endif /* def FEATURE_CONNECTION_SHARING */
1174
1175
1176 /*********************************************************************
1177  *
1178  * Function    :  save_connection_destination
1179  *
1180  * Description :  Remembers a connection for reuse later on.
1181  *
1182  * Parameters  :
1183  *          1  :  sfd  = Open socket to remember.
1184  *          2  :  http = The destination for the connection.
1185  *          3  :  fwd  = The forwarder settings used.
1186  *          4  :  server_connection  = storage.
1187  *
1188  * Returns     : void
1189  *
1190  *********************************************************************/
1191 static void save_connection_destination(jb_socket sfd,
1192                                         const struct http_request *http,
1193                                         const struct forward_spec *fwd,
1194                                         struct reusable_connection *server_connection)
1195 {
1196    assert(sfd != JB_INVALID_SOCKET);
1197    assert(NULL != http->host);
1198
1199    server_connection->sfd = sfd;
1200    server_connection->host = strdup_or_die(http->host);
1201    server_connection->port = http->port;
1202
1203    assert(NULL != fwd);
1204    assert(server_connection->gateway_host == NULL);
1205    assert(server_connection->gateway_port == 0);
1206    assert(server_connection->forwarder_type == 0);
1207    assert(server_connection->forward_host == NULL);
1208    assert(server_connection->forward_port == 0);
1209
1210    server_connection->forwarder_type = fwd->type;
1211    if (NULL != fwd->gateway_host)
1212    {
1213       server_connection->gateway_host = strdup_or_die(fwd->gateway_host);
1214    }
1215    else
1216    {
1217       server_connection->gateway_host = NULL;
1218    }
1219    server_connection->gateway_port = fwd->gateway_port;
1220    if (NULL != fwd->auth_username)
1221    {
1222       server_connection->auth_username = strdup_or_die(fwd->auth_username);
1223    }
1224    else
1225    {
1226       server_connection->auth_username = NULL;
1227    }
1228    if (NULL != fwd->auth_password)
1229    {
1230       server_connection->auth_password = strdup_or_die(fwd->auth_password);
1231    }
1232    else
1233    {
1234       server_connection->auth_password = NULL;
1235    }
1236
1237    if (NULL != fwd->forward_host)
1238    {
1239       server_connection->forward_host = strdup_or_die(fwd->forward_host);
1240    }
1241    else
1242    {
1243       server_connection->forward_host = NULL;
1244    }
1245    server_connection->forward_port = fwd->forward_port;
1246 }
1247 #endif /* FEATURE_CONNECTION_KEEP_ALIVE */
1248
1249
1250 /*********************************************************************
1251  *
1252  * Function    : verify_request_length
1253  *
1254  * Description : Checks if we already got the whole client requests
1255  *               and sets CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ if
1256  *               we do.
1257  *
1258  *               Data that doesn't belong to the current request is
1259  *               either thrown away to let the client retry on a clean
1260  *               socket, or stashed to be dealt with after the current
1261  *               request is served.
1262  *
1263  * Parameters  :
1264  *          1  :  csp = Current client state (buffers, headers, etc...)
1265  *
1266  * Returns     :  void
1267  *
1268  *********************************************************************/
1269 static void verify_request_length(struct client_state *csp)
1270 {
1271    unsigned long long buffered_request_bytes =
1272       (unsigned long long)(csp->client_iob->eod - csp->client_iob->cur);
1273
1274    if ((csp->expected_client_content_length != 0)
1275       && (buffered_request_bytes != 0))
1276    {
1277       if (csp->expected_client_content_length >= buffered_request_bytes)
1278       {
1279          csp->expected_client_content_length -= buffered_request_bytes;
1280          log_error(LOG_LEVEL_CONNECT, "Reduced expected bytes to %llu "
1281             "to account for the %llu ones we already got.",
1282             csp->expected_client_content_length, buffered_request_bytes);
1283       }
1284       else
1285       {
1286          assert(csp->client_iob->eod > csp->client_iob->cur + csp->expected_client_content_length);
1287          csp->client_iob->eod = csp->client_iob->cur + csp->expected_client_content_length;
1288          log_error(LOG_LEVEL_CONNECT, "Reducing expected bytes to 0. "
1289             "Marking the server socket tainted after throwing %llu bytes away.",
1290             buffered_request_bytes - csp->expected_client_content_length);
1291          csp->expected_client_content_length = 0;
1292          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1293       }
1294
1295       if (csp->expected_client_content_length == 0)
1296       {
1297          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1298       }
1299    }
1300
1301    if (!(csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ)
1302       && ((csp->client_iob->cur < csp->client_iob->eod)
1303          || (csp->expected_client_content_length != 0)))
1304    {
1305       if (strcmpic(csp->http->gpc, "GET")
1306          && strcmpic(csp->http->gpc, "HEAD")
1307          && strcmpic(csp->http->gpc, "TRACE")
1308          && strcmpic(csp->http->gpc, "OPTIONS")
1309          && strcmpic(csp->http->gpc, "DELETE"))
1310       {
1311          /* XXX: this is an incomplete hack */
1312          csp->flags &= ~CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1313          log_error(LOG_LEVEL_CONNECT, "There better be a request body.");
1314       }
1315       else
1316       {
1317          csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1318
1319          if ((csp->config->feature_flags & RUNTIME_FEATURE_TOLERATE_PIPELINING) == 0)
1320          {
1321             csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1322             log_error(LOG_LEVEL_CONNECT,
1323                "Possible pipeline attempt detected. The connection will not "
1324                "be kept alive and we will only serve the first request.");
1325             /* Nuke the pipelined requests from orbit, just to be sure. */
1326             clear_iob(csp->client_iob);
1327          }
1328          else
1329          {
1330             /*
1331              * Keep the pipelined data around for now, we'll deal with
1332              * it once we're done serving the current request.
1333              */
1334             csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
1335             assert(csp->client_iob->eod >= csp->client_iob->cur);
1336             log_error(LOG_LEVEL_CONNECT, "Complete client request followed by "
1337                "%d bytes of pipelined data received.",
1338                (int)(csp->client_iob->eod - csp->client_iob->cur));
1339          }
1340       }
1341    }
1342    else
1343    {
1344       csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
1345       log_error(LOG_LEVEL_CONNECT, "Complete client request received.");
1346    }
1347 }
1348
1349
1350 /*********************************************************************
1351  *
1352  * Function    :  mark_server_socket_tainted
1353  *
1354  * Description :  Makes sure we don't reuse a server socket
1355  *                (if we didn't read everything the server sent
1356  *                us reusing the socket would lead to garbage).
1357  *
1358  * Parameters  :
1359  *          1  :  csp = Current client state (buffers, headers, etc...)
1360  *
1361  * Returns     :  void.
1362  *
1363  *********************************************************************/
1364 static void mark_server_socket_tainted(struct client_state *csp)
1365 {
1366    /*
1367     * For consistency we always mark the server socket
1368     * tainted, however, to reduce the log noise we only
1369     * emit a log message if the server socket could have
1370     * actually been reused.
1371     */
1372    if ((csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
1373       && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED))
1374    {
1375       log_error(LOG_LEVEL_CONNECT,
1376          "Marking the server socket %d tainted.",
1377          csp->server_connection.sfd);
1378    }
1379    csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
1380 }
1381
1382 /*********************************************************************
1383  *
1384  * Function    :  get_request_line
1385  *
1386  * Description : Read the client request line.
1387  *
1388  * Parameters  :
1389  *          1  :  csp = Current client state (buffers, headers, etc...)
1390  *
1391  * Returns     :  Pointer to request line or NULL in case of errors.
1392  *
1393  *********************************************************************/
1394 static char *get_request_line(struct client_state *csp)
1395 {
1396    char buf[BUFFER_SIZE];
1397    char *request_line = NULL;
1398    int len;
1399
1400    memset(buf, 0, sizeof(buf));
1401
1402    if ((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
1403    {
1404       /*
1405        * If there are multiple pipelined requests waiting,
1406        * the flag will be set again once the next request
1407        * has been parsed.
1408        */
1409       csp->flags &= ~CSP_FLAG_PIPELINED_REQUEST_WAITING;
1410
1411       request_line = get_header(csp->client_iob);
1412       if ((NULL != request_line) && ('\0' != *request_line))
1413       {
1414          return request_line;
1415       }
1416       else
1417       {
1418          log_error(LOG_LEVEL_CONNECT, "No complete request line "
1419             "received yet. Continuing reading from %d.", csp->cfd);
1420       }
1421    }
1422
1423    do
1424    {
1425       if (
1426 #ifdef FUZZ
1427           0 == (csp->flags & CSP_FLAG_FUZZED_INPUT) &&
1428 #endif
1429           !data_is_available(csp->cfd, csp->config->socket_timeout)
1430           )
1431       {
1432          if (socket_is_still_alive(csp->cfd))
1433          {
1434             log_error(LOG_LEVEL_CONNECT,
1435                "No request line on socket %d received in time. Timeout: %d.",
1436                csp->cfd, csp->config->socket_timeout);
1437             write_socket_delayed(csp->cfd, CLIENT_CONNECTION_TIMEOUT_RESPONSE,
1438                strlen(CLIENT_CONNECTION_TIMEOUT_RESPONSE),
1439                get_write_delay(csp));
1440          }
1441          else
1442          {
1443             log_error(LOG_LEVEL_CONNECT,
1444                "The client side of the connection on socket %d got "
1445                "closed without sending a complete request line.", csp->cfd);
1446          }
1447          return NULL;
1448       }
1449
1450       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1451
1452       if (len <= 0) return NULL;
1453
1454       /*
1455        * If there is no memory left for buffering the
1456        * request, there is nothing we can do but hang up
1457        */
1458       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1459       {
1460          return NULL;
1461       }
1462
1463       request_line = get_header(csp->client_iob);
1464
1465    } while ((NULL != request_line) && ('\0' == *request_line));
1466
1467    return request_line;
1468
1469 }
1470
1471 enum chunk_status
1472 {
1473    CHUNK_STATUS_MISSING_DATA,
1474    CHUNK_STATUS_BODY_COMPLETE,
1475    CHUNK_STATUS_PARSE_ERROR
1476 };
1477
1478
1479 /*********************************************************************
1480  *
1481  * Function    :  chunked_body_is_complete
1482  *
1483  * Description :  Figures out whether or not a chunked body is complete.
1484  *
1485  *                Currently it always starts at the beginning of the
1486  *                buffer which is somewhat wasteful and prevents Privoxy
1487  *                from starting to forward the correctly parsed chunks
1488  *                as soon as theoretically possible.
1489  *
1490  *                Should be modified to work with a common buffer,
1491  *                and allow the caller to skip already parsed chunks.
1492  *
1493  *                This would allow the function to be used for unbuffered
1494  *                response bodies as well.
1495  *
1496  * Parameters  :
1497  *          1  :  iob = Buffer with the body to check.
1498  *          2  :  length = Length of complete body
1499  *
1500  * Returns     :  Enum with the result of the check.
1501  *
1502  *********************************************************************/
1503 static enum chunk_status chunked_body_is_complete(struct iob *iob, size_t *length)
1504 {
1505    unsigned int chunksize;
1506    char *p = iob->cur;
1507
1508    do
1509    {
1510       /*
1511        * We need at least a single digit, followed by "\r\n",
1512        * followed by an unknown amount of data, followed by "\r\n".
1513        */
1514       if (p + 5 > iob->eod)
1515       {
1516          return CHUNK_STATUS_MISSING_DATA;
1517       }
1518       if (sscanf(p, "%x", &chunksize) != 1)
1519       {
1520          return CHUNK_STATUS_PARSE_ERROR;
1521       }
1522
1523       /*
1524        * We want at least a single digit, followed by "\r\n",
1525        * followed by the specified amount of data, followed by "\r\n".
1526        */
1527       if (p + chunksize + 5 > iob->eod)
1528       {
1529          return CHUNK_STATUS_MISSING_DATA;
1530       }
1531
1532       /* Skip chunk-size. */
1533       p = strstr(p, "\r\n");
1534       if (NULL == p)
1535       {
1536          return CHUNK_STATUS_PARSE_ERROR;
1537       }
1538       /* Move beyond the chunkdata. */
1539       p += 2 + chunksize;
1540
1541       /* Make sure we're still within the buffer and have two bytes left */
1542       if (p + 2 > iob->eod)
1543       {
1544          return CHUNK_STATUS_MISSING_DATA;
1545       }
1546
1547       /* There should be another "\r\n" to skip */
1548       if (memcmp(p, "\r\n", 2))
1549       {
1550          return CHUNK_STATUS_PARSE_ERROR;
1551       }
1552       p += 2;
1553    } while (chunksize > 0U);
1554
1555    *length = (size_t)(p - iob->cur);
1556    assert(*length <= (size_t)(iob->eod - iob->cur));
1557    assert(p <= iob->eod);
1558
1559    return CHUNK_STATUS_BODY_COMPLETE;
1560
1561 }
1562
1563
1564 /*********************************************************************
1565  *
1566  * Function    : receive_chunked_client_request_body
1567  *
1568  * Description : Read the chunk-encoded client request body.
1569  *               Failures are dealt with.
1570  *
1571  * Parameters  :
1572  *          1  :  csp = Current client state (buffers, headers, etc...)
1573  *
1574  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1575  *
1576  *********************************************************************/
1577 static jb_err receive_chunked_client_request_body(struct client_state *csp)
1578 {
1579    size_t body_length;
1580    enum chunk_status status;
1581
1582    while (CHUNK_STATUS_MISSING_DATA ==
1583       (status = chunked_body_is_complete(csp->client_iob, &body_length)))
1584    {
1585       char buf[BUFFER_SIZE];
1586       int len;
1587
1588       if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1589       {
1590          log_error(LOG_LEVEL_ERROR,
1591             "Timeout while waiting for the client body.");
1592          break;
1593       }
1594       len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1595       if (len <= 0)
1596       {
1597          log_error(LOG_LEVEL_ERROR,
1598             "Reading the client body failed: %E");
1599          break;
1600       }
1601       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1602       {
1603          break;
1604       }
1605    }
1606    if (status != CHUNK_STATUS_BODY_COMPLETE)
1607    {
1608       write_socket_delayed(csp->cfd, CLIENT_BODY_PARSE_ERROR_RESPONSE,
1609          strlen(CLIENT_BODY_PARSE_ERROR_RESPONSE), get_write_delay(csp));
1610       log_error(LOG_LEVEL_CLF,
1611          "%s - - [%T] \"Failed reading chunked client body\" 400 0", csp->ip_addr_str);
1612       return JB_ERR_PARSE;
1613    }
1614    log_error(LOG_LEVEL_CONNECT,
1615       "Chunked client body completely read. Length: %lu", body_length);
1616    csp->expected_client_content_length = body_length;
1617
1618    return JB_ERR_OK;
1619
1620 }
1621
1622
1623 #ifdef FUZZ
1624 /*********************************************************************
1625  *
1626  * Function    :  fuzz_chunked_transfer_encoding
1627  *
1628  * Description :  Treat the fuzzed input as chunked transfer encoding
1629  *                to check and dechunk.
1630  *
1631  * Parameters  :
1632  *          1  :  csp      = Used to store the data.
1633  *          2  :  fuzz_input_file = File to read the input from.
1634  *
1635  * Returns     : Result of dechunking
1636  *
1637  *********************************************************************/
1638 extern int fuzz_chunked_transfer_encoding(struct client_state *csp, char *fuzz_input_file)
1639 {
1640    size_t length;
1641    size_t size = (size_t)(csp->iob->eod - csp->iob->cur);
1642    enum chunk_status status;
1643
1644    status = chunked_body_is_complete(csp->iob, &length);
1645    if (CHUNK_STATUS_BODY_COMPLETE != status)
1646    {
1647       log_error(LOG_LEVEL_INFO, "Chunked body is incomplete or invalid");
1648    }
1649
1650    return (JB_ERR_OK == remove_chunked_transfer_coding(csp->iob->cur, &size));
1651
1652 }
1653
1654
1655 /*********************************************************************
1656  *
1657  * Function    : fuzz_client_request
1658  *
1659  * Description : Try to get a client request from the fuzzed input.
1660  *
1661  * Parameters  :
1662  *          1  :  csp = Current client state (buffers, headers, etc...)
1663  *          2  :  fuzz_input_file = File to read the input from.
1664  *
1665  * Returns     :  Result of fuzzing.
1666  *
1667  *********************************************************************/
1668 extern int fuzz_client_request(struct client_state *csp, char *fuzz_input_file)
1669 {
1670    jb_err err;
1671
1672    csp->cfd = 0;
1673    csp->ip_addr_str = "fuzzer";
1674
1675    if (strcmp(fuzz_input_file, "-") != 0)
1676    {
1677       log_error(LOG_LEVEL_FATAL,
1678          "Fuzzed client requests can currently only be read from stdin (-).");
1679    }
1680    err = receive_client_request(csp);
1681    if (err != JB_ERR_OK)
1682    {
1683       return 1;
1684    }
1685    err = parse_client_request(csp);
1686    if (err != JB_ERR_OK)
1687    {
1688       return 1;
1689    }
1690
1691    return 0;
1692
1693 }
1694 #endif  /* def FUZZ */
1695
1696
1697 #ifdef FEATURE_FORCE_LOAD
1698 /*********************************************************************
1699  *
1700  * Function    :  force_required
1701  *
1702  * Description : Checks a request line to see if it contains
1703  *               the FORCE_PREFIX. If it does, it is removed
1704  *               unless enforcing requests has beend disabled.
1705  *
1706  * Parameters  :
1707  *          1  :  request_line = HTTP request line
1708  *
1709  * Returns     :  TRUE if force is required, FALSE otherwise.
1710  *
1711  *********************************************************************/
1712 static int force_required(const struct client_state *csp, char *request_line)
1713 {
1714    char *p;
1715
1716    p = strstr(request_line, "http://");
1717    if (p != NULL)
1718    {
1719       /* Skip protocol */
1720       p += strlen("http://");
1721    }
1722    else
1723    {
1724       /* Intercepted request usually don't specify the protocol. */
1725       p = request_line;
1726    }
1727
1728    /* Go to the beginning of the path */
1729    p = strstr(p, "/");
1730    if (p == NULL)
1731    {
1732       /*
1733        * If the path is missing the request line is invalid and we
1734        * are done here. The client-visible rejection happens later on.
1735        */
1736       return 0;
1737    }
1738
1739    if (0 == strncmpic(p, FORCE_PREFIX, strlen(FORCE_PREFIX) - 1))
1740    {
1741       if (!(csp->config->feature_flags & RUNTIME_FEATURE_ENFORCE_BLOCKS))
1742       {
1743          /* XXX: Should clean more carefully */
1744          strclean(request_line, FORCE_PREFIX);
1745          log_error(LOG_LEVEL_FORCE,
1746             "Enforcing request: \"%s\".", request_line);
1747
1748          return 1;
1749       }
1750       log_error(LOG_LEVEL_FORCE,
1751          "Ignored force prefix in request: \"%s\".", request_line);
1752    }
1753
1754    return 0;
1755
1756 }
1757 #endif /* def FEATURE_FORCE_LOAD */
1758
1759
1760 /*********************************************************************
1761  *
1762  * Function    :  receive_client_request
1763  *
1764  * Description : Read the client's request (more precisely the
1765  *               client headers) and answer it if necessary.
1766  *
1767  * Parameters  :
1768  *          1  :  csp = Current client state (buffers, headers, etc...)
1769  *
1770  * Returns     :  JB_ERR_OK, JB_ERR_PARSE or JB_ERR_MEMORY
1771  *
1772  *********************************************************************/
1773 static jb_err receive_client_request(struct client_state *csp)
1774 {
1775    char buf[BUFFER_SIZE];
1776    char *p;
1777    char *req = NULL;
1778    struct http_request *http;
1779    int len;
1780    jb_err err;
1781
1782    /* Temporary copy of the client's headers before they get enlisted in csp->headers */
1783    struct list header_list;
1784    struct list *headers = &header_list;
1785
1786    /* We don't care if the arriving data is a valid HTTP request or not. */
1787    csp->requests_received_total++;
1788
1789    http = csp->http;
1790
1791    memset(buf, 0, sizeof(buf));
1792
1793    req = get_request_line(csp);
1794    if (req == NULL)
1795    {
1796       mark_server_socket_tainted(csp);
1797       return JB_ERR_PARSE;
1798    }
1799    assert(*req != '\0');
1800
1801    if (client_protocol_is_unsupported(csp, req))
1802    {
1803       return JB_ERR_PARSE;
1804    }
1805
1806 #ifdef FEATURE_FORCE_LOAD
1807    if (force_required(csp, req))
1808    {
1809       csp->flags |= CSP_FLAG_FORCED;
1810    }
1811 #endif /* def FEATURE_FORCE_LOAD */
1812
1813    err = parse_http_request(req, http);
1814    freez(req);
1815    if (JB_ERR_OK != err)
1816    {
1817       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1818          get_write_delay(csp));
1819       /* XXX: Use correct size */
1820       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
1821       log_error(LOG_LEVEL_ERROR,
1822          "Couldn't parse request line received from %s: %s",
1823          csp->ip_addr_str, jb_err_to_string(err));
1824
1825       free_http_request(http);
1826       return JB_ERR_PARSE;
1827    }
1828    if (http->ssl && strcmpic(http->gpc, "CONNECT"))
1829    {
1830       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER),
1831          get_write_delay(csp));
1832       /* XXX: Use correct size */
1833       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0",
1834          csp->ip_addr_str);
1835       log_error(LOG_LEVEL_ERROR, "Client %s tried to send a https "
1836          "URL without sending a CONNECT request first",
1837          csp->ip_addr_str);
1838       free_http_request(http);
1839       return JB_ERR_PARSE;
1840    }
1841
1842    /* grab the rest of the client's headers */
1843    init_list(headers);
1844    for (;;)
1845    {
1846       p = get_header(csp->client_iob);
1847
1848       if (p == NULL)
1849       {
1850          /* There are no additional headers to read. */
1851          break;
1852       }
1853
1854       if (*p == '\0')
1855       {
1856          /*
1857           * We didn't receive a complete header
1858           * line yet, get the rest of it.
1859           */
1860          if (!data_is_available(csp->cfd, csp->config->socket_timeout))
1861          {
1862             log_error(LOG_LEVEL_ERROR,
1863                "Client headers did not arrive in time. Timeout: %d",
1864                csp->config->socket_timeout);
1865             destroy_list(headers);
1866             return JB_ERR_PARSE;
1867          }
1868
1869          len = read_socket(csp->cfd, buf, sizeof(buf) - 1);
1870          if (len <= 0)
1871          {
1872             log_error(LOG_LEVEL_ERROR, "read from client failed: %E");
1873             destroy_list(headers);
1874             return JB_ERR_PARSE;
1875          }
1876
1877          if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
1878          {
1879             /*
1880              * If there is no memory left for buffering the
1881              * request, there is nothing we can do but hang up
1882              */
1883             destroy_list(headers);
1884             return JB_ERR_MEMORY;
1885          }
1886       }
1887       else
1888       {
1889          if (!strncmpic(p, "Transfer-Encoding:", 18))
1890          {
1891             /*
1892              * XXX: should be called through sed()
1893              *      but currently can't.
1894              */
1895             client_transfer_encoding(csp, &p);
1896          }
1897          /*
1898           * We were able to read a complete
1899           * header and can finally enlist it.
1900           */
1901          enlist(headers, p);
1902          freez(p);
1903       }
1904    }
1905
1906    if (http->host == NULL)
1907    {
1908       /*
1909        * If we still don't know the request destination,
1910        * the request is invalid or the client uses
1911        * Privoxy without its knowledge.
1912        */
1913       if (JB_ERR_OK != get_request_destination_elsewhere(csp, headers))
1914       {
1915          /*
1916           * Our attempts to get the request destination
1917           * elsewhere failed or Privoxy is configured
1918           * to only accept proxy requests.
1919           *
1920           * An error response has already been sent
1921           * and we're done here.
1922           */
1923          return JB_ERR_PARSE;
1924       }
1925    }
1926
1927 #ifdef FEATURE_CLIENT_TAGS
1928    /* XXX: If the headers were enlisted sooner, passing csp would do. */
1929    set_client_address(csp, headers);
1930    get_tag_list_for_client(csp->client_tags, csp->client_address);
1931 #endif
1932
1933    /*
1934     * Determine the actions for this URL
1935     */
1936 #ifdef FEATURE_TOGGLE
1937    if (!(csp->flags & CSP_FLAG_TOGGLED_ON))
1938    {
1939       /* Most compatible set of actions (i.e. none) */
1940       init_current_action(csp->action);
1941    }
1942    else
1943 #endif /* ndef FEATURE_TOGGLE */
1944    {
1945       get_url_actions(csp, http);
1946    }
1947
1948    enlist(csp->headers, http->cmd);
1949
1950    /* Append the previously read headers */
1951    err = list_append_list_unique(csp->headers, headers);
1952    destroy_list(headers);
1953
1954    return err;
1955
1956 }
1957
1958
1959 /*********************************************************************
1960  *
1961  * Function    : parse_client_request
1962  *
1963  * Description : Parses the client's request and decides what to do
1964  *               with it.
1965  *
1966  *               Note that since we're not using select() we could get
1967  *               blocked here if a client connected, then didn't say
1968  *               anything!
1969  *
1970  * Parameters  :
1971  *          1  :  csp = Current client state (buffers, headers, etc...)
1972  *
1973  * Returns     :  JB_ERR_OK or JB_ERR_PARSE
1974  *
1975  *********************************************************************/
1976 static jb_err parse_client_request(struct client_state *csp)
1977 {
1978    struct http_request *http = csp->http;
1979    jb_err err;
1980
1981 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
1982    if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
1983     && (!strcmpic(csp->http->version, "HTTP/1.1"))
1984     && (csp->http->ssl == 0))
1985    {
1986       /* Assume persistence until further notice */
1987       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
1988    }
1989 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
1990
1991    if (csp->http->ssl == 0)
1992    {
1993       /*
1994        * This whole block belongs to chat() but currently
1995        * has to be executed before sed().
1996        */
1997       if (csp->flags & CSP_FLAG_CHUNKED_CLIENT_BODY)
1998       {
1999          if (receive_chunked_client_request_body(csp) != JB_ERR_OK)
2000          {
2001             return JB_ERR_PARSE;
2002          }
2003       }
2004       else
2005       {
2006          csp->expected_client_content_length = get_expected_content_length(csp->headers);
2007       }
2008       verify_request_length(csp);
2009    }
2010 #ifndef FEATURE_HTTPS_INSPECTION
2011    else
2012    {
2013       csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
2014    }
2015 #endif
2016
2017    err = sed(csp, FILTER_CLIENT_HEADERS);
2018    if (JB_ERR_OK != err)
2019    {
2020       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2021          csp->ip_addr_str);
2022       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2023          csp->ip_addr_str, csp->http->cmd);
2024       write_socket_delayed(csp->cfd, CHEADER, strlen(CHEADER), get_write_delay(csp));
2025       return JB_ERR_PARSE;
2026    }
2027    csp->flags |= CSP_FLAG_CLIENT_HEADER_PARSING_DONE;
2028
2029    /* Check request line for rewrites. */
2030    if ((NULL == csp->headers->first->str)
2031       || (strcmp(http->cmd, csp->headers->first->str) &&
2032          (JB_ERR_OK != change_request_destination(csp))))
2033    {
2034       /*
2035        * A header filter broke the request line - bail out.
2036        */
2037       write_socket_delayed(csp->cfd, MESSED_UP_REQUEST_RESPONSE,
2038          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2039       /* XXX: Use correct size */
2040       log_error(LOG_LEVEL_CLF,
2041          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2042       log_error(LOG_LEVEL_ERROR,
2043          "Invalid request line after applying header filters.");
2044       free_http_request(http);
2045
2046       return JB_ERR_PARSE;
2047    }
2048
2049    if (client_has_unsupported_expectations(csp))
2050    {
2051       return JB_ERR_PARSE;
2052    }
2053
2054    return JB_ERR_OK;
2055
2056 }
2057
2058
2059 /*********************************************************************
2060  *
2061  * Function    : read_http_request_body
2062  *
2063  * Description : Reads remaining request body from the client.
2064  *
2065  * Parameters  :
2066  *          1  :  csp = Current client state (buffers, headers, etc...)
2067  *
2068  * Returns     :  0 on success, anything else is an error.
2069  *
2070  *********************************************************************/
2071 static int read_http_request_body(struct client_state *csp)
2072 {
2073    size_t to_read = csp->expected_client_content_length;
2074    int len;
2075
2076    assert(to_read != 0);
2077
2078    /* check if all data has been already read */
2079    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2080    {
2081       return 0;
2082    }
2083
2084    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2085         to_read > 0 && data_is_available(csp->cfd, csp->config->socket_timeout);
2086         to_read -= (unsigned)len)
2087    {
2088       char buf[BUFFER_SIZE];
2089       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2090
2091       log_error(LOG_LEVEL_CONNECT,
2092          "Waiting for up to %lu bytes of request body from the client.",
2093          max_bytes_to_read);
2094       len = read_socket(csp->cfd, buf, (int)max_bytes_to_read);
2095       if (len <= -1)
2096       {
2097          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s: %E", csp->ip_addr_str);
2098          return 1;
2099       }
2100       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2101       {
2102          return 1;
2103       }
2104       assert(to_read >= len);
2105    }
2106
2107    if (to_read != 0)
2108    {
2109       log_error(LOG_LEVEL_CONNECT,
2110          "Not enough request body has been read: expected %lu more bytes",
2111          to_read);
2112       return 1;
2113    }
2114    log_error(LOG_LEVEL_CONNECT,
2115       "The last %d bytes of the request body have been read", len);
2116    return 0;
2117 }
2118
2119
2120 /*********************************************************************
2121  *
2122  * Function    : update_client_headers
2123  *
2124  * Description : Updates the HTTP headers from the client request.
2125  *
2126  * Parameters  :
2127  *          1  :  csp = Current client state (buffers, headers, etc...)
2128  *          2  :  new_content_length = new content length value to set
2129  *
2130  * Returns     :  0 on success, anything else is an error.
2131  *
2132  *********************************************************************/
2133 static int update_client_headers(struct client_state *csp, size_t new_content_length)
2134 {
2135    static const char content_length[] = "Content-Length:";
2136    int updated = 0;
2137    struct list_entry *p;
2138
2139 #ifndef FEATURE_HTTPS_INSPECTION
2140    for (p = csp->headers->first;
2141 #else
2142    for (p = csp->http->client_ssl ? csp->https_headers->first : csp->headers->first;
2143 #endif
2144         !updated  && (p != NULL); p = p->next)
2145    {
2146       /* Header crunch()ed in previous run? -> ignore */
2147       if (p->str == NULL)
2148       {
2149          continue;
2150       }
2151
2152       /* Does the current parser handle this header? */
2153       if (0 == strncmpic(p->str, content_length, sizeof(content_length) - 1))
2154       {
2155          updated = (JB_ERR_OK == header_adjust_content_length((char **)&(p->str), new_content_length));
2156          if (!updated)
2157          {
2158             return 1;
2159          }
2160       }
2161    }
2162
2163    return !updated;
2164 }
2165
2166
2167 /*********************************************************************
2168  *
2169  * Function    : can_filter_request_body
2170  *
2171  * Description : Checks if the current request body can be stored in
2172  *               the client_iob without hitting buffer limit.
2173  *
2174  * Parameters  :
2175  *          1  : csp = Current client state (buffers, headers, etc...)
2176  *
2177  * Returns     : TRUE if the current request size do not exceed buffer limit
2178  *               FALSE otherwise.
2179  *
2180  *********************************************************************/
2181 static int can_filter_request_body(const struct client_state *csp)
2182 {
2183    if (!can_add_to_iob(csp->client_iob, csp->config->buffer_limit,
2184                        csp->expected_client_content_length))
2185    {
2186       log_error(LOG_LEVEL_INFO,
2187          "Not filtering request body from %s: buffer limit %lu will be exceeded "
2188          "(content length %llu)", csp->ip_addr_str, csp->config->buffer_limit,
2189          csp->expected_client_content_length);
2190       return FALSE;
2191    }
2192    return TRUE;
2193 }
2194
2195
2196 /*********************************************************************
2197  *
2198  * Function    : send_http_request
2199  *
2200  * Description : Sends the HTTP headers from the client request
2201  *               and all the body data that has already been received.
2202  *
2203  * Parameters  :
2204  *          1  :  csp = Current client state (buffers, headers, etc...)
2205  *
2206  * Returns     :  0 on success, anything else is an error.
2207  *
2208  *********************************************************************/
2209 static int send_http_request(struct client_state *csp)
2210 {
2211    char *hdr;
2212    int write_failure;
2213    const char *to_send;
2214    size_t to_send_len;
2215    int filter_client_body = csp->expected_client_content_length != 0 &&
2216       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2217
2218    if (filter_client_body)
2219    {
2220       if (read_http_request_body(csp))
2221       {
2222          return 1;
2223       }
2224       to_send_len = csp->expected_client_content_length;
2225       to_send = execute_client_body_filters(csp, &to_send_len);
2226       if (to_send == NULL)
2227       {
2228          /* just flush client_iob */
2229          filter_client_body = FALSE;
2230       }
2231       else if (to_send_len != csp->expected_client_content_length &&
2232          update_client_headers(csp, to_send_len))
2233       {
2234          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2235          freez(to_send);
2236          return 1;
2237       }
2238       csp->expected_client_content_length = 0;
2239    }
2240
2241    hdr = list_to_text(csp->headers);
2242    if (hdr == NULL)
2243    {
2244       /* FIXME Should handle error properly */
2245       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2246    }
2247    list_remove_all(csp->headers);
2248
2249    /*
2250     * Write the client's (modified) header to the server
2251     * (along with anything else that may be in the buffer)
2252     */
2253    write_failure = 0 != write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
2254    freez(hdr);
2255
2256    if (write_failure)
2257    {
2258       log_error(LOG_LEVEL_CONNECT, "Failed sending request headers to: %s: %E",
2259          csp->http->hostport);
2260       if (filter_client_body)
2261       {
2262          freez(to_send);
2263       }
2264       return 1;
2265    }
2266
2267    if (filter_client_body)
2268    {
2269       write_failure = 0 != write_socket(csp->server_connection.sfd, to_send, to_send_len);
2270       freez(to_send);
2271       if (write_failure)
2272       {
2273          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s: %E",
2274             csp->http->hostport);
2275          return 1;
2276       }
2277    }
2278
2279    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2280       && (flush_iob(csp->server_connection.sfd, csp->client_iob, 0) < 0))
2281    {
2282       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2283          csp->http->hostport);
2284       return 1;
2285    }
2286    return 0;
2287 }
2288
2289
2290 #ifdef FEATURE_HTTPS_INSPECTION
2291 /*********************************************************************
2292  *
2293  * Function    : read_https_request_body
2294  *
2295  * Description : Reads remaining request body from the client.
2296  *
2297  * Parameters  :
2298  *          1  :  csp = Current client state (buffers, headers, etc...)
2299  *
2300  * Returns     :  0 on success, anything else is an error.
2301  *
2302  *********************************************************************/
2303 static int read_https_request_body(struct client_state *csp)
2304 {
2305    size_t to_read = csp->expected_client_content_length;
2306    int len;
2307
2308    assert(to_read != 0);
2309
2310    /* check if all data has been already read */
2311    if (to_read <= (csp->client_iob->eod - csp->client_iob->cur))
2312    {
2313       return 0;
2314    }
2315
2316    for (to_read -= (size_t)(csp->client_iob->eod - csp->client_iob->cur);
2317         to_read > 0 && (is_ssl_pending(&(csp->ssl_client_attr)) ||
2318           data_is_available(csp->cfd, csp->config->socket_timeout));
2319         to_read -= (unsigned)len)
2320    {
2321       unsigned char buf[BUFFER_SIZE];
2322       size_t max_bytes_to_read = to_read < sizeof(buf) ? to_read : sizeof(buf);
2323
2324       log_error(LOG_LEVEL_CONNECT,
2325          "Waiting for up to %lu bytes of request body from the client.",
2326          max_bytes_to_read);
2327       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2328          (unsigned)max_bytes_to_read);
2329       if (len <= 0)
2330       {
2331          log_error(LOG_LEVEL_CONNECT, "Failed receiving request body from %s", csp->ip_addr_str);
2332          return 1;
2333       }
2334       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, (char *)buf, len))
2335       {
2336          return 1;
2337       }
2338       assert(to_read >= len);
2339    }
2340
2341    if (to_read != 0)
2342    {
2343       log_error(LOG_LEVEL_CONNECT,
2344          "Not enough request body has been read: expected %lu more bytes",
2345          to_read);
2346       return 1;
2347    }
2348
2349    log_error(LOG_LEVEL_CONNECT,
2350       "The last %llu bytes of the request body have been read",
2351       csp->expected_client_content_length);
2352    return 0;
2353 }
2354
2355
2356 /*********************************************************************
2357  *
2358  * Function    : receive_and_send_encrypted_post_data
2359  *
2360  * Description : Reads remaining request body from the client and sends
2361  *               it to the server.
2362  *
2363  * Parameters  :
2364  *          1  :  csp = Current client state (buffers, headers, etc...)
2365  *
2366  * Returns     :  0 on success, anything else is an error.
2367  *
2368  *********************************************************************/
2369 static int receive_and_send_encrypted_post_data(struct client_state *csp)
2370 {
2371    int content_length_known = csp->expected_client_content_length != 0;
2372
2373    while ((content_length_known && csp->expected_client_content_length != 0) ||
2374       (is_ssl_pending(&(csp->ssl_client_attr)) ||
2375             data_is_available(csp->cfd, csp->config->socket_timeout)))
2376    {
2377       unsigned char buf[BUFFER_SIZE];
2378       int len;
2379       int max_bytes_to_read = sizeof(buf);
2380
2381       if (content_length_known && csp->expected_client_content_length < sizeof(buf))
2382       {
2383          max_bytes_to_read = (int)csp->expected_client_content_length;
2384       }
2385       log_error(LOG_LEVEL_CONNECT,
2386          "Waiting for up to %d bytes of request body from the client.",
2387          max_bytes_to_read);
2388       len = ssl_recv_data(&(csp->ssl_client_attr), buf,
2389          (unsigned)max_bytes_to_read);
2390       if (len == -1)
2391       {
2392          return 1;
2393       }
2394       if (len == 0)
2395       {
2396          /* XXX: Does this actually happen? */
2397          break;
2398       }
2399       log_error(LOG_LEVEL_CONNECT, "Forwarding %d bytes of encrypted request body",
2400          len);
2401       len = ssl_send_data(&(csp->ssl_server_attr), buf, (size_t)len);
2402       if (len == -1)
2403       {
2404          return 1;
2405       }
2406       if (csp->expected_client_content_length != 0)
2407       {
2408          if (csp->expected_client_content_length >= len)
2409          {
2410             csp->expected_client_content_length -= (unsigned)len;
2411          }
2412          if (csp->expected_client_content_length == 0)
2413          {
2414             log_error(LOG_LEVEL_CONNECT, "Forwarded the last %d bytes", len);
2415             break;
2416          }
2417       }
2418    }
2419
2420    log_error(LOG_LEVEL_CONNECT, "Done forwarding encrypted request body");
2421
2422    return 0;
2423
2424 }
2425
2426
2427 /*********************************************************************
2428  *
2429  * Function    : send_https_request
2430  *
2431  * Description : Sends the HTTP headers from the client request
2432  *               and all the body data that has already been received.
2433  *
2434  * Parameters  :
2435  *          1  :  csp = Current client state (buffers, headers, etc...)
2436  *
2437  * Returns     :  0 on success, anything else is an error.
2438  *
2439  *********************************************************************/
2440 static int send_https_request(struct client_state *csp)
2441 {
2442    char *hdr;
2443    int ret;
2444    long flushed = 0;
2445    const char *to_send;
2446    size_t to_send_len;
2447    int filter_client_body = csp->expected_client_content_length != 0 &&
2448       client_body_filters_enabled(csp->action) && can_filter_request_body(csp);
2449
2450    if (filter_client_body)
2451    {
2452       if (read_https_request_body(csp))
2453       {
2454          return 1;
2455       }
2456       to_send_len = csp->expected_client_content_length;
2457       to_send = execute_client_body_filters(csp, &to_send_len);
2458       if (to_send == NULL)
2459       {
2460          /* just flush client_iob */
2461          filter_client_body = FALSE;
2462       }
2463       else if (to_send_len != csp->expected_client_content_length &&
2464          update_client_headers(csp, to_send_len))
2465       {
2466          log_error(LOG_LEVEL_HEADER, "Error updating client headers");
2467          return 1;
2468       }
2469       csp->expected_client_content_length = 0;
2470    }
2471
2472    hdr = list_to_text(csp->https_headers);
2473    if (hdr == NULL)
2474    {
2475       /* FIXME Should handle error properly */
2476       log_error(LOG_LEVEL_FATAL, "Out of memory parsing client header");
2477    }
2478    list_remove_all(csp->https_headers);
2479
2480    /*
2481     * Write the client's (modified) header to the server
2482     * (along with anything else that may be in the buffer)
2483     */
2484    ret = ssl_send_data(&(csp->ssl_server_attr),
2485       (const unsigned char *)hdr, strlen(hdr));
2486    freez(hdr);
2487
2488    if (ret < 0)
2489    {
2490       log_error(LOG_LEVEL_CONNECT,
2491          "Failed sending encrypted request headers to: %s: %E",
2492          csp->http->hostport);
2493       mark_server_socket_tainted(csp);
2494       return 1;
2495    }
2496
2497    if (filter_client_body)
2498    {
2499       ret = ssl_send_data(&(csp->ssl_server_attr), (const unsigned char *)to_send, to_send_len);
2500       freez(to_send);
2501       if (ret < 0)
2502       {
2503          log_error(LOG_LEVEL_CONNECT, "Failed sending filtered request body to: %s",
2504             csp->http->hostport);
2505          return 1;
2506       }
2507    }
2508
2509    if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) == 0)
2510       && ((flushed = ssl_flush_socket(&(csp->ssl_server_attr),
2511             csp->client_iob)) < 0))
2512    {
2513       log_error(LOG_LEVEL_CONNECT, "Failed sending request body to: %s: %E",
2514          csp->http->hostport);
2515       return 1;
2516    }
2517    if (flushed != 0 || csp->expected_client_content_length != 0)
2518    {
2519       if (csp->expected_client_content_length != 0)
2520       {
2521          if (csp->expected_client_content_length < flushed)
2522          {
2523             log_error(LOG_LEVEL_ERROR,
2524                "Flushed %ld bytes of request body while only expecting %llu",
2525                flushed, csp->expected_client_content_length);
2526             csp->expected_client_content_length = 0;
2527          }
2528          else
2529          {
2530             log_error(LOG_LEVEL_CONNECT,
2531                "Flushed %ld bytes of request body while expecting %llu",
2532                flushed, csp->expected_client_content_length);
2533             csp->expected_client_content_length -= (unsigned)flushed;
2534             if (receive_and_send_encrypted_post_data(csp))
2535             {
2536                return 1;
2537             }
2538          }
2539       }
2540       else
2541       {
2542          log_error(LOG_LEVEL_CONNECT,
2543             "Flushed %ld bytes of request body", flushed);
2544       }
2545    }
2546
2547    log_error(LOG_LEVEL_CONNECT, "Encrypted request sent");
2548
2549    return 0;
2550
2551 }
2552
2553
2554 /*********************************************************************
2555  *
2556  * Function    :  receive_encrypted_request_headers
2557  *
2558  * Description :  Receives the encrypted request headers when
2559  *                https-inspecting.
2560  *
2561  * Parameters  :
2562  *          1  :  csp = Current client state (buffers, headers, etc...)
2563  *
2564  * Returns     :  JB_ERR_OK on success,
2565  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2566  *
2567  *********************************************************************/
2568 static jb_err receive_encrypted_request_headers(struct client_state *csp)
2569 {
2570    char buf[BUFFER_SIZE];
2571    int len;
2572    char *p;
2573
2574    do
2575    {
2576       log_error(LOG_LEVEL_HEADER, "Waiting for encrypted client headers");
2577       if (!is_ssl_pending(&(csp->ssl_client_attr)) &&
2578           !data_is_available(csp->cfd, csp->config->socket_timeout))
2579       {
2580          log_error(LOG_LEVEL_CONNECT,
2581             "Socket %d timed out while waiting for client headers", csp->cfd);
2582          return JB_ERR_PARSE;
2583       }
2584       len = ssl_recv_data(&(csp->ssl_client_attr),
2585          (unsigned char *)buf, sizeof(buf));
2586       if (len == 0)
2587       {
2588          log_error(LOG_LEVEL_CONNECT,
2589             "Socket %d closed while waiting for client headers", csp->cfd);
2590          return JB_ERR_PARSE;
2591       }
2592       if (len == -1)
2593       {
2594          return JB_ERR_PARSE;
2595       }
2596       if (add_to_iob(csp->client_iob, csp->config->buffer_limit, buf, len))
2597       {
2598          return JB_ERR_MEMORY;
2599       }
2600       p = strstr(csp->client_iob->cur, "\r\n\r\n");
2601    } while (p == NULL);
2602
2603    log_error(LOG_LEVEL_HEADER, "Encrypted headers received completely");
2604
2605    return JB_ERR_OK;
2606 }
2607
2608
2609 /*********************************************************************
2610  *
2611  * Function    :  change_encrypted_request_destination
2612  *
2613  * Description :  Parse a (rewritten) request line from an encrypted
2614  *                request and regenerate the http request data.
2615  *
2616  * Parameters  :
2617  *          1  :  csp = Current client state (buffers, headers, etc...)
2618  *
2619  * Returns     :  Forwards the parse_http_request() return code.
2620  *                Terminates in case of memory problems.
2621  *
2622  *********************************************************************/
2623 static jb_err change_encrypted_request_destination(struct client_state *csp)
2624 {
2625    jb_err err;
2626    char *original_host = csp->http->host;
2627    int original_port = csp->http->port;
2628
2629    log_error(LOG_LEVEL_REDIRECTS, "Rewrite detected: %s",
2630       csp->https_headers->first->str);
2631    csp->http->host = NULL;
2632    free_http_request(csp->http);
2633    err = parse_http_request(csp->https_headers->first->str, csp->http);
2634    if (JB_ERR_OK != err)
2635    {
2636       log_error(LOG_LEVEL_ERROR, "Couldn't parse rewritten request: %s.",
2637          jb_err_to_string(err));
2638       freez(original_host);
2639       return err;
2640    }
2641
2642    if (csp->http->host == NULL)
2643    {
2644       char port_string[10];
2645       /*
2646        * The rewritten request line did not specify a host
2647        * which means we can use the original host specified
2648        * by the client.
2649        */
2650       csp->http->host = original_host;
2651       csp->http->port = original_port;
2652       log_error(LOG_LEVEL_REDIRECTS, "Keeping the original host: %s",
2653          csp->http->host);
2654       /*
2655        * If the rewritten request line didn't contain a host
2656        * it also didn't contain a port so we can reuse the host
2657        * port.
2658        */
2659       freez(csp->http->hostport);
2660       csp->http->hostport = strdup_or_die(csp->http->host);
2661       snprintf(port_string, sizeof(port_string), ":%d", original_port);
2662       err = string_append(&csp->http->hostport, port_string);
2663       if (err != JB_ERR_OK)
2664       {
2665          log_error(LOG_LEVEL_ERROR, "Failed to rebuild hostport: %s.",
2666             jb_err_to_string(err));
2667          return err;
2668       }
2669
2670       /*
2671        * While the request line didn't mention it,
2672        * we're https-inspecting and want to speak TLS
2673        * with the server.
2674        */
2675       csp->http->server_ssl = 1;
2676       csp->http->ssl = 1;
2677    }
2678    else
2679    {
2680       /* The rewrite filter added a host so we can ditch the original */
2681       freez(original_host);
2682       csp->http->server_ssl = csp->http->ssl;
2683    }
2684
2685    csp->http->client_ssl = 1;
2686
2687    freez(csp->https_headers->first->str);
2688    build_request_line(csp, NULL, &csp->https_headers->first->str);
2689
2690    if (!server_use_ssl(csp))
2691    {
2692       log_error(LOG_LEVEL_REDIRECTS,
2693          "Rewritten request line results in downgrade to http");
2694       /*
2695        * Replace the unencryptd headers received with the
2696        * CONNECT request with the ones we received securely.
2697        */
2698       destroy_list(csp->headers);
2699       csp->headers->first = csp->https_headers->first;
2700       csp->headers->last  = csp->https_headers->last;
2701       csp->https_headers->first = NULL;
2702       csp->https_headers->last = NULL;
2703    }
2704
2705    return JB_ERR_OK;
2706
2707 }
2708
2709
2710 /*********************************************************************
2711  *
2712  * Function    :  process_encrypted_request_headers
2713  *
2714  * Description :  Receives and parses the encrypted headers send
2715  *                by the client when https-inspecting.
2716  *
2717  * Parameters  :
2718  *          1  :  csp = Current client state (buffers, headers, etc...)
2719  *
2720  * Returns     :  JB_ERR_OK on success,
2721  *                JB_ERR_PARSE or JB_ERR_MEMORY otherwise
2722  *
2723  *********************************************************************/
2724 static jb_err process_encrypted_request_headers(struct client_state *csp)
2725 {
2726    char *p;
2727    char *request_line;
2728    jb_err err;
2729    /* Temporary copy of the client's headers before they get enlisted in csp->https_headers */
2730    struct list header_list;
2731    struct list *headers = &header_list;
2732
2733    assert(csp->ssl_with_client_is_opened);
2734
2735 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2736    if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
2737    {
2738       csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2739    }
2740 #endif
2741    err = receive_encrypted_request_headers(csp);
2742    if (err != JB_ERR_OK)
2743    {
2744       if (csp->client_iob->cur == NULL ||
2745           csp->client_iob->cur == csp->client_iob->eod)
2746       {
2747          /*
2748           * We did not receive any data, most likely because the
2749           * client is done. Don't log this as a parse failure.
2750           */
2751          return JB_ERR_PARSE;
2752       }
2753       /* XXX: Also used for JB_ERR_MEMORY */
2754       log_error(LOG_LEVEL_ERROR, "Failed to receive encrypted request: %s",
2755          jb_err_to_string(err));
2756       ssl_send_data_delayed(&(csp->ssl_client_attr),
2757          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2758       return err;
2759    }
2760
2761    /* We don't need get_request_line() because the whole HTTP head is buffered. */
2762    request_line = get_header(csp->client_iob);
2763    if (request_line == NULL)
2764    {
2765       log_error(LOG_LEVEL_ERROR, "Failed to get the encrypted request line");
2766       ssl_send_data_delayed(&(csp->ssl_client_attr),
2767          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2768       return JB_ERR_PARSE;
2769    }
2770    assert(*request_line != '\0');
2771
2772    if (client_protocol_is_unsupported(csp, request_line))
2773    {
2774       /*
2775        * If the protocol is unsupported we're done here.
2776        * client_protocol_is_unsupported() took care of sending
2777        * the error response and logging the error message.
2778        */
2779       return JB_ERR_PARSE;
2780    }
2781
2782 #ifdef FEATURE_FORCE_LOAD
2783    if (force_required(csp, request_line))
2784    {
2785       csp->flags |= CSP_FLAG_FORCED;
2786    }
2787 #endif /* def FEATURE_FORCE_LOAD */
2788
2789    free_http_request(csp->http);
2790
2791    err = parse_http_request(request_line, csp->http);
2792    /* XXX: Restore ssl setting. This is ugly */
2793    csp->http->client_ssl = 1;
2794    csp->http->server_ssl = 1;
2795
2796    freez(request_line);
2797    if (JB_ERR_OK != err)
2798    {
2799       ssl_send_data_delayed(&(csp->ssl_client_attr),
2800          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2801       /* XXX: Use correct size */
2802       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"Invalid request\" 400 0", csp->ip_addr_str);
2803       log_error(LOG_LEVEL_ERROR,
2804          "Couldn't parse request line received from %s: %s",
2805          csp->ip_addr_str, jb_err_to_string(err));
2806
2807       free_http_request(csp->http);
2808       return JB_ERR_PARSE;
2809    }
2810
2811    /* Parse the rest of the client's headers. */
2812    init_list(headers);
2813    for (;;)
2814    {
2815       p = get_header(csp->client_iob);
2816
2817       if (p == NULL)
2818       {
2819          /* There are no additional headers to read. */
2820          break;
2821       }
2822       enlist(headers, p);
2823       freez(p);
2824    }
2825
2826    if (JB_ERR_OK != get_destination_from_https_headers(headers, csp->http))
2827    {
2828       /*
2829        * Our attempts to get the request destination
2830        * elsewhere failed.
2831        */
2832       log_error(LOG_LEVEL_ERROR,
2833          "Failed to get the encrypted request destination");
2834       ssl_send_data_delayed(&(csp->ssl_client_attr),
2835          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2836       destroy_list(headers);
2837
2838       return JB_ERR_PARSE;
2839    }
2840
2841    /* Split the domain we just got for pattern matching */
2842    init_domain_components(csp->http);
2843
2844 #ifdef FEATURE_CLIENT_TAGS
2845    /* XXX: If the headers were enlisted sooner, passing csp would do. */
2846    if (csp->client_address == NULL)
2847    {
2848       set_client_address(csp, headers);
2849       get_tag_list_for_client(csp->client_tags, csp->client_address);
2850    }
2851 #endif
2852
2853 #ifdef FEATURE_TOGGLE
2854    if ((csp->flags & CSP_FLAG_TOGGLED_ON) != 0)
2855 #endif
2856    {
2857       /*
2858        * Determine the actions for this request after
2859        * clearing the ones from the previous one.
2860        */
2861       free_current_action(csp->action);
2862       get_url_actions(csp, csp->http);
2863    }
2864
2865    enlist(csp->https_headers, csp->http->cmd);
2866
2867    /* Append the previously read headers */
2868    err = list_append_list_unique(csp->https_headers, headers);
2869    destroy_list(headers);
2870    if (JB_ERR_OK != err)
2871    {
2872       /* XXX: Send error message */
2873       return err;
2874    }
2875
2876    /* XXX: Work around crash */
2877    csp->error_message = NULL;
2878
2879    /* XXX: Why do this here? */
2880    csp->http->ssl = 1;
2881
2882    err = sed_https(csp);
2883    if (JB_ERR_OK != err)
2884    {
2885       ssl_send_data_delayed(&(csp->ssl_client_attr),
2886          (const unsigned char *)CHEADER, strlen(CHEADER), get_write_delay(csp));
2887       log_error(LOG_LEVEL_ERROR, "Failed to parse client request from %s.",
2888          csp->ip_addr_str);
2889       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 400 0",
2890          csp->ip_addr_str, csp->http->cmd);
2891       return JB_ERR_PARSE;
2892    }
2893
2894    if ((NULL == csp->https_headers->first->str)
2895       || (strcmp(csp->http->cmd, csp->https_headers->first->str) &&
2896          (JB_ERR_OK != change_encrypted_request_destination(csp))))
2897    {
2898       ssl_send_data_delayed(&(csp->ssl_client_attr),
2899          (const unsigned char *)MESSED_UP_REQUEST_RESPONSE,
2900          strlen(MESSED_UP_REQUEST_RESPONSE), get_write_delay(csp));
2901       log_error(LOG_LEVEL_ERROR,
2902          "Invalid request line after applying header filters.");
2903       /* XXX: Use correct size */
2904       log_error(LOG_LEVEL_CLF,
2905          "%s - - [%T] \"Invalid request generated\" 400 0", csp->ip_addr_str);
2906
2907       return JB_ERR_PARSE;
2908    }
2909
2910    log_error(LOG_LEVEL_HEADER, "Encrypted request headers processed");
2911    log_error(LOG_LEVEL_REQUEST, "https://%s%s", csp->http->hostport,
2912       csp->http->path);
2913
2914    return err;
2915
2916 }
2917
2918 /*********************************************************************
2919  *
2920  * Function    :  cgi_page_requested
2921  *
2922  * Description :  Checks if a request is for an internal CGI page.
2923  *
2924  * Parameters  :
2925  *          1  :  host = The host requested by the client.
2926  *
2927  * Returns     :  1 if a CGI page has been requested, 0 otherwise
2928  *
2929  *********************************************************************/
2930 static int cgi_page_requested(const char *host)
2931 {
2932    if ((0 == strcmpic(host, CGI_SITE_1_HOST))
2933     || (0 == strcmpic(host, CGI_SITE_1_HOST "."))
2934     || (0 == strcmpic(host, CGI_SITE_2_HOST))
2935     || (0 == strcmpic(host, CGI_SITE_2_HOST ".")))
2936    {
2937       return 1;
2938    }
2939
2940    return 0;
2941
2942 }
2943
2944
2945 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
2946 /*********************************************************************
2947  *
2948  * Function    :  continue_https_chat
2949  *
2950  * Description :  Behaves similar to chat() but only deals with
2951  *                https-inspected requests that arrive on an already
2952  *                established connection. The first request is always
2953  *                served by chat() which is a lot more complex as it
2954  *                has to deal with forwarding settings and connection
2955  *                failures etc.
2956  *
2957  *                If a connection to the server has already been
2958  *                opened it is reused unless the request is blocked
2959  *                or the forwarder changed.
2960  *
2961  *                If a connection to the server has not yet been
2962  *                opened (because the previous request was crunched),
2963  *                or the forwarder changed, the connection is dropped
2964  *                so that the client retries on a fresh one.
2965  *
2966  * Parameters  :
2967  *          1  :  csp = Current client state (buffers, headers, etc...)
2968  *
2969  * Returns     :  Nothing.
2970  *
2971  *********************************************************************/
2972 static void continue_https_chat(struct client_state *csp)
2973 {
2974    const struct forward_spec *fwd;
2975
2976    if (JB_ERR_OK != process_encrypted_request_headers(csp))
2977    {
2978       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
2979       return;
2980    }
2981
2982 #if defined(FEATURE_STATISTICS) && defined(MUTEX_LOCKS_AVAILABLE)
2983    privoxy_mutex_lock(&block_statistics_mutex);
2984    number_of_requests_received++;
2985    privoxy_mutex_unlock(&block_statistics_mutex);
2986 #endif
2987
2988    csp->requests_received_total++;
2989
2990    /*
2991     * We have an encrypted request. Check if one of the crunchers wants it.
2992     */
2993    if (crunch_response_triggered(csp, crunchers_all))
2994    {
2995       /*
2996        * Yes. The client got the crunch response and we're done here.
2997        */
2998       return;
2999    }
3000    if (csp->ssl_with_server_is_opened == 0)
3001    {
3002       log_error(LOG_LEVEL_CONNECT,
3003          "Dropping the client connection on socket %d. "
3004          "The server connection has not been established yet.",
3005          csp->cfd);
3006       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
3007       return;
3008    }
3009    assert(csp->server_connection.sfd != JB_INVALID_SOCKET);
3010
3011    fwd = forward_url(csp, csp->http);
3012    if (!connection_destination_matches(&csp->server_connection, csp->http, fwd))
3013    {
3014       log_error(LOG_LEVEL_CONNECT,
3015          "Dropping the client connection on socket %d with "
3016          "server socket %d connected to %s. The forwarder has changed.",
3017          csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
3018       csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
3019       return;
3020    }
3021
3022    log_applied_actions(csp->action);
3023
3024    log_error(LOG_LEVEL_CONNECT,
3025       "Reusing server socket %d connected to %s. Requests already sent: %u.",
3026       csp->server_connection.sfd, csp->server_connection.host,
3027       csp->server_connection.requests_sent_total);
3028
3029    if (send_https_request(csp))
3030    {
3031       /*
3032        * Most likely the server connection timed out. We can't easily
3033        * create a new one so simply drop the client connection without a
3034        * error response to let the client retry.
3035        */
3036       log_error(LOG_LEVEL_CONNECT,
3037          "Dropping client connection on socket %d. "
3038          "Forwarding the encrypted client request failed.",
3039          csp->cfd);
3040       return;
3041    }
3042    csp->server_connection.request_sent = time(NULL);
3043    csp->server_connection.requests_sent_total++;
3044    handle_established_connection(csp);
3045    freez(csp->receive_buffer);
3046 }
3047 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3048 #endif
3049
3050
3051 /*********************************************************************
3052  *
3053  * Function    :  handle_established_connection
3054  *
3055  * Description :  Shuffle data between client and server once the
3056  *                connection has been established and the request
3057  *                has been sent.
3058  *
3059  * Parameters  :
3060  *          1  :  csp = Current client state (buffers, headers, etc...)
3061  *
3062  * Returns     :  Nothing.
3063  *
3064  *********************************************************************/
3065 static void handle_established_connection(struct client_state *csp)
3066 {
3067    char *hdr;
3068    char *p;
3069    int n;
3070 #ifdef HAVE_POLL
3071    struct pollfd poll_fds[2];
3072 #else
3073    fd_set rfds;
3074    jb_socket maxfd;
3075    struct timeval timeout;
3076 #endif
3077    int server_body;
3078    int ms_iis5_hack = 0;
3079    unsigned long long byte_count = 0;
3080    struct http_request *http;
3081    long len = 0; /* for buffer sizes (and negative error codes) */
3082    int buffer_and_filter_content = 0;
3083    unsigned int write_delay;
3084 #ifdef FEATURE_HTTPS_INSPECTION
3085    int ret = 0;
3086    int use_ssl_tunnel = 0;
3087    csp->dont_verify_certificate = 0;
3088
3089    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION))
3090    {
3091       /* Pass encrypted content without filtering. */
3092       use_ssl_tunnel = 1;
3093    }
3094 #endif
3095
3096    /* Skeleton for HTTP response, if we should intercept the request */
3097    struct http_response *rsp;
3098 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3099    int watch_client_socket;
3100 #endif
3101
3102    csp->receive_buffer_size = csp->config->receive_buffer_size;
3103    csp->receive_buffer = zalloc(csp->receive_buffer_size + 1);
3104    if (csp->receive_buffer == NULL)
3105    {
3106       log_error(LOG_LEVEL_ERROR,
3107          "Out of memory. Failed to allocate the receive buffer.");
3108       rsp = cgi_error_memory();
3109       send_crunch_response(csp, rsp);
3110       return;
3111    }
3112
3113    http = csp->http;
3114
3115 #ifndef HAVE_POLL
3116    maxfd = (csp->cfd > csp->server_connection.sfd) ?
3117       csp->cfd : csp->server_connection.sfd;
3118 #endif
3119
3120    /* pass data between the client and server
3121     * until one or the other shuts down the connection.
3122     */
3123
3124    server_body = 0;
3125
3126 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3127    watch_client_socket = 0 == (csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING);
3128 #endif
3129    write_delay = get_write_delay(csp);
3130
3131    for (;;)
3132    {
3133 #ifdef FEATURE_HTTPS_INSPECTION
3134       if (server_use_ssl(csp) && is_ssl_pending(&(csp->ssl_server_attr)))
3135       {
3136          /*
3137           * It's possible that the TLS library already consumed all the
3138           * data the server intends to send. If that happens poll() and
3139           * select() will no longer see the data as available so we have
3140           * to skip the calls.
3141           */
3142          goto server_wants_to_talk;
3143       }
3144       if (watch_client_socket && client_use_ssl(csp) &&
3145          is_ssl_pending(&(csp->ssl_client_attr)))
3146       {
3147          /*
3148           * The TLS libray may also consume all of the remaining data
3149           * from the client when we're shuffling the data from an
3150           * unbuffered request body to the server.
3151           */
3152          goto client_wants_to_talk;
3153       }
3154 #endif
3155 #ifndef HAVE_POLL
3156       FD_ZERO(&rfds);
3157 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3158       if (!watch_client_socket)
3159       {
3160          maxfd = csp->server_connection.sfd;
3161       }
3162       else
3163 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3164       {
3165          FD_SET(csp->cfd, &rfds);
3166       }
3167
3168       FD_SET(csp->server_connection.sfd, &rfds);
3169 #endif /* ndef HAVE_POLL */
3170
3171 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3172       if ((csp->flags & CSP_FLAG_CHUNKED)
3173          && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
3174          && ((csp->iob->eod - csp->iob->cur) >= 5)
3175          && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
3176       {
3177          /*
3178           * XXX: This check should be obsolete now,
3179           *      but let's wait a while to be sure.
3180           */
3181          log_error(LOG_LEVEL_CONNECT,
3182             "Looks like we got the last chunk together with "
3183             "the server headers but didn't detect it earlier. "
3184             "We better stop reading.");
3185          byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3186          csp->expected_content_length = byte_count;
3187          csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3188       }
3189       if (server_body && server_response_is_complete(csp, byte_count))
3190       {
3191          if (csp->expected_content_length == byte_count)
3192          {
3193             log_error(LOG_LEVEL_CONNECT,
3194                "Done reading from server. Content length: %llu as expected. "
3195                "Bytes most recently read: %ld.",
3196                byte_count, len);
3197          }
3198          else
3199          {
3200             log_error(LOG_LEVEL_CONNECT,
3201                "Done reading from server. Expected content length: %llu. "
3202                "Actual content length: %llu. Bytes most recently read: %ld.",
3203                csp->expected_content_length, byte_count, len);
3204          }
3205          len = 0;
3206          /*
3207           * XXX: Should not jump around, handle_established_connection()
3208           * is complicated enough already.
3209           */
3210          goto reading_done;
3211       }
3212 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3213
3214 #ifdef HAVE_POLL
3215       poll_fds[0].fd = csp->cfd;
3216 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3217       if (!watch_client_socket)
3218       {
3219          /*
3220           * Ignore incoming data, but still watch out
3221           * for disconnects etc. These flags are always
3222           * implied anyway but explicitly setting them
3223           * doesn't hurt.
3224           */
3225          poll_fds[0].events = POLLERR|POLLHUP;
3226       }
3227       else
3228 #endif
3229       {
3230          poll_fds[0].events = POLLIN;
3231       }
3232       poll_fds[1].fd = csp->server_connection.sfd;
3233       poll_fds[1].events = POLLIN;
3234       n = poll(poll_fds, 2, csp->config->socket_timeout * 1000);
3235 #else
3236       timeout.tv_sec = csp->config->socket_timeout;
3237       timeout.tv_usec = 0;
3238       n = select((int)maxfd + 1, &rfds, NULL, NULL, &timeout);
3239 #endif /* def HAVE_POLL */
3240
3241       /* Server or client not responding in timeout */
3242       if (n == 0)
3243       {
3244          log_error(LOG_LEVEL_CONNECT, "Socket timeout %d reached: %s",
3245             csp->config->socket_timeout, http->url);
3246          if ((byte_count == 0) && (http->ssl == 0))
3247          {
3248             send_crunch_response(csp, error_response(csp, "connection-timeout"));
3249          }
3250          mark_server_socket_tainted(csp);
3251 #ifdef FEATURE_HTTPS_INSPECTION
3252          close_client_and_server_ssl_connections(csp);
3253 #endif
3254          return;
3255       }
3256       else if (n < 0)
3257       {
3258 #ifdef HAVE_POLL
3259          log_error(LOG_LEVEL_ERROR, "poll() failed!: %E");
3260 #else
3261          log_error(LOG_LEVEL_ERROR, "select() failed!: %E");
3262 #endif
3263          mark_server_socket_tainted(csp);
3264 #ifdef FEATURE_HTTPS_INSPECTION
3265          close_client_and_server_ssl_connections(csp);
3266 #endif
3267          return;
3268       }
3269
3270       /*
3271        * This is the body of the browser's request,
3272        * just read and write it.
3273        *
3274        * Receives data from browser and sends it to server
3275        *
3276        * XXX: Make sure the client doesn't use pipelining
3277        * behind Privoxy's back.
3278        */
3279 #ifdef HAVE_POLL
3280       if ((poll_fds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) != 0)
3281       {
3282          log_error(LOG_LEVEL_CONNECT,
3283             "The client socket %d has become unusable while "
3284             "the server socket %d is still open.",
3285             csp->cfd, csp->server_connection.sfd);
3286          mark_server_socket_tainted(csp);
3287          break;
3288       }
3289
3290       if (poll_fds[0].revents != 0)
3291 #else
3292       if (FD_ISSET(csp->cfd, &rfds))
3293 #endif /* def HAVE_POLL*/
3294       {
3295          int max_bytes_to_read;
3296
3297 #ifdef FEATURE_HTTPS_INSPECTION
3298          client_wants_to_talk:
3299 #endif
3300
3301          max_bytes_to_read = (int)csp->receive_buffer_size;
3302
3303 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3304          if ((csp->flags & CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ))
3305          {
3306             if (data_is_available(csp->cfd, 0))
3307             {
3308                /*
3309                 * If the next request is already waiting, we have
3310                 * to stop select()ing the client socket. Otherwise
3311                 * we would always return right away and get nothing
3312                 * else done.
3313                 */
3314                watch_client_socket = 0;
3315                log_error(LOG_LEVEL_CONNECT,
3316                   "Stop watching client socket %d. "
3317                   "There's already another request waiting.",
3318                   csp->cfd);
3319                continue;
3320             }
3321             /*
3322              * If the client socket is set, but there's no data
3323              * available on the socket, the client went fishing
3324              * and continuing talking to the server makes no sense.
3325              */
3326             log_error(LOG_LEVEL_CONNECT,
3327                "The client closed socket %d while "
3328                "the server socket %d is still open.",
3329                csp->cfd, csp->server_connection.sfd);
3330             mark_server_socket_tainted(csp);
3331             break;
3332          }
3333          if (csp->expected_client_content_length != 0)
3334          {
3335             if (csp->expected_client_content_length < csp->receive_buffer_size)
3336             {
3337                max_bytes_to_read = (int)csp->expected_client_content_length;
3338             }
3339             log_error(LOG_LEVEL_CONNECT,
3340                "Waiting for up to %d bytes from the client.",
3341                max_bytes_to_read);
3342          }
3343          assert(max_bytes_to_read <= csp->receive_buffer_size);
3344 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3345
3346 #ifdef FEATURE_HTTPS_INSPECTION
3347          if (client_use_ssl(csp))
3348          {
3349             if (csp->http->status == 101)
3350             {
3351                len = ssl_recv_data(&(csp->ssl_client_attr),
3352                   (unsigned char *)csp->receive_buffer,
3353                   (size_t)max_bytes_to_read);
3354                if (len == -1)
3355                {
3356                   log_error(LOG_LEVEL_ERROR, "Failed to receive data "
3357                      "on client socket %d for an upgraded connection",
3358                      csp->cfd);
3359                   break;
3360                }
3361                if (len == 0)
3362                {
3363                   log_error(LOG_LEVEL_CONNECT, "Done receiving data "
3364                      "on client socket %d for an upgraded connection",
3365                      csp->cfd);
3366                   break;
3367                }
3368                byte_count += (unsigned long long)len;
3369                len = ssl_send_data(&(csp->ssl_server_attr),
3370                   (unsigned char *)csp->receive_buffer, (size_t)len);
3371                if (len == -1)
3372                {
3373                   log_error(LOG_LEVEL_ERROR, "Failed to send data "
3374                      "on server socket %d for an upgraded connection",
3375                      csp->server_connection.sfd);
3376                   break;
3377                }
3378                continue;
3379             }
3380             log_error(LOG_LEVEL_CONNECT, "Breaking with TLS/SSL.");
3381             break;
3382          }
3383          else
3384 #endif /* def FEATURE_HTTPS_INSPECTION */
3385          {
3386             len = read_socket(csp->cfd, csp->receive_buffer, max_bytes_to_read);
3387
3388             if (len <= 0)
3389             {
3390                /* XXX: not sure if this is necessary. */
3391                mark_server_socket_tainted(csp);
3392                break; /* "game over, man" */
3393             }
3394
3395 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3396             if (csp->expected_client_content_length != 0)
3397             {
3398                assert(len <= max_bytes_to_read);
3399                csp->expected_client_content_length -= (unsigned)len;
3400                log_error(LOG_LEVEL_CONNECT,
3401                   "Expected client content length set to %llu "
3402                   "after reading %ld bytes.",
3403                   csp->expected_client_content_length, len);
3404                if (csp->expected_client_content_length == 0)
3405                {
3406                   log_error(LOG_LEVEL_CONNECT,
3407                      "Done reading from the client.");
3408                   csp->flags |= CSP_FLAG_CLIENT_REQUEST_COMPLETELY_READ;
3409                }
3410             }
3411 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3412
3413             if (write_socket(csp->server_connection.sfd, csp->receive_buffer, (size_t)len))
3414             {
3415                log_error(LOG_LEVEL_ERROR, "write to: %s failed: %E", http->host);
3416                mark_server_socket_tainted(csp);
3417                return;
3418             }
3419          }
3420          continue;
3421       }
3422
3423       /*
3424        * The server wants to talk. It could be the header or the body.
3425        * If `hdr' is null, then it's the header otherwise it's the body.
3426        * FIXME: Does `hdr' really mean `host'? No.
3427        */
3428 #ifdef HAVE_POLL
3429       if (poll_fds[1].revents != 0)
3430 #else
3431       if (FD_ISSET(csp->server_connection.sfd, &rfds))
3432 #endif /* HAVE_POLL */
3433       {
3434 #ifdef FEATURE_HTTPS_INSPECTION
3435          server_wants_to_talk:
3436 #endif
3437 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3438          /*
3439           * If we are buffering content, we don't want to eat up to
3440           * buffer-limit bytes if the client no longer cares about them.
3441           * If we aren't buffering, however, a dead client socket will be
3442           * noticed pretty much right away anyway, so we can reduce the
3443           * overhead by skipping the check.
3444           */
3445          if (buffer_and_filter_content && !socket_is_still_alive(csp->cfd))
3446          {
3447 #ifdef _WIN32
3448             log_error(LOG_LEVEL_CONNECT,
3449                "The server still wants to talk, but the client may already have hung up on us.");
3450 #else
3451             log_error(LOG_LEVEL_CONNECT,
3452                "The server still wants to talk, but the client hung up on us.");
3453             mark_server_socket_tainted(csp);
3454 #ifdef FEATURE_HTTPS_INSPECTION
3455             close_client_and_server_ssl_connections(csp);
3456 #endif
3457             return;
3458 #endif /* def _WIN32 */
3459          }
3460 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
3461
3462 #ifdef FEATURE_HTTPS_INSPECTION
3463          /*
3464           * Reading data from standard or secured connection (HTTP/HTTPS)
3465           */
3466          if (server_use_ssl(csp))
3467          {
3468             len = ssl_recv_data(&(csp->ssl_server_attr),
3469                (unsigned char *)csp->receive_buffer, csp->receive_buffer_size);
3470          }
3471          else
3472 #endif
3473          {
3474             len = read_socket(csp->server_connection.sfd, csp->receive_buffer,
3475                (int)csp->receive_buffer_size);
3476          }
3477
3478          if (len < 0)
3479          {
3480             log_error(LOG_LEVEL_ERROR, "read from: %s failed: %E", http->host);
3481
3482             if ((http->ssl && (csp->fwd == NULL))
3483 #ifdef FEATURE_HTTPS_INSPECTION
3484                && use_ssl_tunnel
3485 #endif
3486                 )
3487             {
3488                /*
3489                 * Just hang up. We already confirmed the client's CONNECT
3490                 * request with status code 200 and unencrypted content is
3491                 * no longer welcome.
3492                 */
3493                log_error(LOG_LEVEL_ERROR,
3494                   "CONNECT already confirmed. Unable to tell the client about the problem.");
3495                return;
3496             }
3497             else if (byte_count)
3498             {
3499                /*
3500                 * Just hang up. We already transmitted the original headers
3501                 * and parts of the original content and therefore missed the
3502                 * chance to send an error message (without risking data corruption).
3503                 *
3504                 * XXX: we could retry with a fancy range request here.
3505                 */
3506                log_error(LOG_LEVEL_ERROR, "Already forwarded the original headers. "
3507                   "Unable to tell the client about the problem.");
3508                mark_server_socket_tainted(csp);
3509 #ifdef FEATURE_HTTPS_INSPECTION
3510                close_client_and_server_ssl_connections(csp);
3511 #endif
3512                return;
3513             }
3514             /*
3515              * XXX: Consider handling the cases above the same.
3516              */
3517             mark_server_socket_tainted(csp);
3518             len = 0;
3519          }
3520
3521 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
3522          if (csp->flags & CSP_FLAG_CHUNKED)
3523          {
3524             if ((len >= 5) && !memcmp(csp->receive_buffer+len-5, "0\r\n\r\n", 5))
3525             {
3526                /* XXX: this is a temporary hack */
3527                log_error(LOG_LEVEL_CONNECT,
3528                   "Looks like we reached the end of the last chunk. "
3529                   "We better stop reading.");
3530                csp->expected_content_length = byte_count + (unsigned long long)len;
3531                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
3532             }
3533          }
3534          reading_done:
3535 #endif  /* FEATURE_CONNECTION_KEEP_ALIVE */
3536
3537          /*
3538           * This is guaranteed by allocating with zalloc_or_die()
3539           * and never (intentionally) writing to the last byte.
3540           *
3541           * csp->receive_buffer_size is the size of the part of the
3542           * buffer we intentionally write to, but we actually
3543           * allocated csp->receive_buffer_size+1 bytes so the assertion
3544           * stays within the allocated range.
3545           */
3546          assert(csp->receive_buffer[csp->receive_buffer_size] == '\0');
3547
3548          /*
3549           * Add a trailing zero to let be able to use string operations.
3550           * XXX: do we still need this with filter_popups gone?
3551           */
3552          assert(len <= csp->receive_buffer_size);
3553          csp->receive_buffer[len] = '\0';
3554
3555          /*
3556           * Normally, this would indicate that we've read
3557           * as much as the server has sent us and we can
3558           * close the client connection.  However, Microsoft
3559           * in its wisdom has released IIS/5 with a bug that
3560           * prevents it from sending the trailing \r\n in
3561           * a 302 redirect header (and possibly other headers).
3562           * To work around this if we've haven't parsed
3563           * a full header we'll append a trailing \r\n
3564           * and see if this now generates a valid one.
3565           *
3566           * This hack shouldn't have any impacts.  If we've
3567           * already transmitted the header or if this is a
3568           * SSL connection, then we won't bother with this
3569           * hack.  So we only work on partially received
3570           * headers.  If we append a \r\n and this still
3571           * doesn't generate a valid header, then we won't
3572           * transmit anything to the client.
3573           */
3574          if (len == 0)
3575          {
3576
3577             if (server_body || (http->ssl
3578 #ifdef FEATURE_HTTPS_INSPECTION
3579                   && use_ssl_tunnel
3580 #endif
3581                ))
3582             {
3583                /*
3584                 * If we have been buffering up the document,
3585                 * now is the time to apply content modification
3586                 * and send the result to the client.
3587                 */
3588                if (buffer_and_filter_content)
3589                {
3590                   p = execute_content_filters(csp);
3591                   /*
3592                    * If content filtering fails, use the original
3593                    * buffer and length.
3594                    * (see p != NULL ? p : csp->iob->cur below)
3595                    */
3596                   if (NULL == p)
3597                   {
3598                      csp->content_length = (size_t)(csp->iob->eod - csp->iob->cur);
3599                   }
3600 #ifdef FEATURE_COMPRESSION
3601                   else if ((csp->flags & CSP_FLAG_CLIENT_SUPPORTS_DEFLATE)
3602                      && (csp->content_length > LOWER_LENGTH_LIMIT_FOR_COMPRESSION))
3603                   {
3604                      char *compressed_content = compress_buffer(p,
3605                         (size_t *)&csp->content_length, csp->config->compression_level);
3606                      if (compressed_content != NULL)
3607                      {
3608                         freez(p);
3609                         p = compressed_content;
3610                         csp->flags |= CSP_FLAG_BUFFERED_CONTENT_DEFLATED;
3611                      }
3612                   }
3613 #endif
3614
3615                   if (JB_ERR_OK != update_server_headers(csp))
3616                   {
3617                      log_error(LOG_LEVEL_FATAL,
3618                         "Failed to update server headers. after filtering.");
3619                   }
3620
3621                   hdr = list_to_text(csp->headers);
3622                   if (hdr == NULL)
3623                   {
3624                      /* FIXME Should handle error properly */
3625                      log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
3626                   }
3627
3628 #ifdef FEATURE_HTTPS_INSPECTION
3629                   /*
3630                    * Sending data with standard or secured connection (HTTP/HTTPS)
3631                    */
3632                   if (client_use_ssl(csp))
3633                   {
3634                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3635                               (const unsigned char *)hdr, strlen(hdr),
3636                               get_write_delay(csp)) < 0)
3637                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3638                               (const unsigned char *) ((p != NULL) ? p : csp->iob->cur),
3639                               csp->content_length, get_write_delay(csp)) < 0))
3640                      {
3641                         log_error(LOG_LEVEL_ERROR,
3642                            "Failed to send the modified content to the client over TLS");
3643                         freez(hdr);
3644                         freez(p);
3645                         mark_server_socket_tainted(csp);
3646                         close_client_and_server_ssl_connections(csp);
3647                         return;
3648                      }
3649                   }
3650                   else
3651 #endif /* def FEATURE_HTTPS_INSPECTION */
3652                   {
3653                      if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
3654                       || write_socket_delayed(csp->cfd, ((p != NULL) ? p : csp->iob->cur),
3655                          (size_t)csp->content_length, write_delay))
3656                      {
3657                         log_error(LOG_LEVEL_ERROR, "write modified content to client failed: %E");
3658                         freez(hdr);
3659                         freez(p);
3660                         mark_server_socket_tainted(csp);
3661                         return;
3662                      }
3663                   }
3664
3665                   freez(hdr);
3666                   freez(p);
3667                }
3668
3669                break; /* "game over, man" */
3670             }
3671
3672             /*
3673              * This is not the body, so let's pretend the server just sent
3674              * us a blank line.
3675              */
3676             snprintf(csp->receive_buffer, csp->receive_buffer_size, "\r\n");
3677             len = (int)strlen(csp->receive_buffer);
3678
3679             /*
3680              * Now, let the normal header parsing algorithm below do its
3681              * job.  If it fails, we'll exit instead of continuing.
3682              */
3683
3684             ms_iis5_hack = 1;
3685          }
3686
3687          /*
3688           * If we're in the body of the server document, just write it to
3689           * the client, unless we need to buffer the body for later
3690           * content-filtering.
3691           */
3692          if (server_body || (http->ssl
3693 #ifdef FEATURE_HTTPS_INSPECTION
3694                && use_ssl_tunnel
3695 #endif
3696             ))
3697          {
3698             if (buffer_and_filter_content)
3699             {
3700                /*
3701                 * If there is no memory left for buffering the content, or the buffer limit
3702                 * has been reached, switch to non-filtering mode, i.e. make & write the
3703                 * header, flush the iob and buf, and get out of the way.
3704                 */
3705                if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3706                {
3707                   size_t hdrlen;
3708                   long flushed;
3709
3710                   log_error(LOG_LEVEL_INFO,
3711                      "Flushing header and buffers. Stepping back from filtering.");
3712
3713                   hdr = list_to_text(csp->headers);
3714                   if (hdr == NULL)
3715                   {
3716                      /*
3717                       * Memory is too tight to even generate the header.
3718                       * Send our static "Out-of-memory" page.
3719                       */
3720                      log_error(LOG_LEVEL_ERROR, "Out of memory while trying to flush.");
3721                      rsp = cgi_error_memory();
3722                      send_crunch_response(csp, rsp);
3723                      mark_server_socket_tainted(csp);
3724 #ifdef FEATURE_HTTPS_INSPECTION
3725                      close_client_and_server_ssl_connections(csp);
3726 #endif
3727                      return;
3728                   }
3729                   hdrlen = strlen(hdr);
3730
3731 #ifdef FEATURE_HTTPS_INSPECTION
3732                   /*
3733                    * Sending data with standard or secured connection (HTTP/HTTPS)
3734                    */
3735                   if (client_use_ssl(csp))
3736                   {
3737                      if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
3738                              (const unsigned char *)hdr, hdrlen, get_write_delay(csp)) < 0)
3739                         || ((flushed = ssl_flush_socket(&(csp->ssl_client_attr),
3740                                 csp->iob)) < 0)
3741                         || (ssl_send_data_delayed(&(csp->ssl_client_attr),
3742                               (const unsigned char *)csp->receive_buffer, (size_t)len,
3743                               get_write_delay(csp)) < 0))
3744                      {
3745                         log_error(LOG_LEVEL_CONNECT,
3746                            "Flush header and buffers to client failed");
3747                         freez(hdr);
3748                         mark_server_socket_tainted(csp);
3749                         close_client_and_server_ssl_connections(csp);
3750                         return;
3751                      }
3752                   }
3753                   else
3754 #endif /* def FEATURE_HTTPS_INSPECTION */
3755                   {
3756                      if (write_socket_delayed(csp->cfd, hdr, hdrlen, write_delay)
3757                       || ((flushed = flush_iob(csp->cfd, csp->iob, write_delay)) < 0)
3758                       || write_socket_delayed(csp->cfd, csp->receive_buffer, (size_t)len,
3759                             write_delay))
3760                      {
3761                         log_error(LOG_LEVEL_CONNECT,
3762                            "Flush header and buffers to client failed: %E");
3763                         freez(hdr);
3764                         mark_server_socket_tainted(csp);
3765                         return;
3766                      }
3767                   }
3768
3769                   /*
3770                    * Reset the byte_count to the amount of bytes
3771                    * we just flushed. len will be added a few lines below,
3772                    * hdrlen doesn't matter for LOG_LEVEL_CLF.
3773                    */
3774                   byte_count = (unsigned long long)flushed;
3775                   freez(hdr);
3776                   buffer_and_filter_content = 0;
3777                   server_body = 1;
3778                }
3779             }
3780             else
3781             {
3782 #ifdef FEATURE_HTTPS_INSPECTION
3783                /*
3784                 * Sending data with standard or secured connection (HTTP/HTTPS)
3785                 */
3786                if (client_use_ssl(csp))
3787                {
3788                   ret = ssl_send_data_delayed(&(csp->ssl_client_attr),
3789                      (const unsigned char *)csp->receive_buffer, (size_t)len,
3790                      get_write_delay(csp));
3791                   if (ret < 0)
3792                   {
3793                      log_error(LOG_LEVEL_ERROR,
3794                         "Sending data to client failed");
3795                      mark_server_socket_tainted(csp);
3796                      close_client_and_server_ssl_connections(csp);
3797                      return;
3798                   }
3799                }
3800                else
3801 #endif /* def FEATURE_HTTPS_INSPECTION */
3802                {
3803                   if (write_socket_delayed(csp->cfd, csp->receive_buffer,
3804                         (size_t)len, write_delay))
3805                   {
3806                      log_error(LOG_LEVEL_ERROR, "write to client failed: %E");
3807                      mark_server_socket_tainted(csp);
3808                      return;
3809                   }
3810                }
3811             }
3812             byte_count += (unsigned long long)len;
3813             continue;
3814          }
3815          else
3816          {
3817             /*
3818              * We're still looking for the end of the server's header.
3819              * Buffer up the data we just read.  If that fails, there's
3820              * little we can do but send our static out-of-memory page.
3821              */
3822             if (add_to_iob(csp->iob, csp->config->buffer_limit, csp->receive_buffer, len))
3823             {
3824                log_error(LOG_LEVEL_ERROR, "Out of memory while looking for end of server headers.");
3825                rsp = cgi_error_memory();
3826                send_crunch_response(csp, rsp);
3827                mark_server_socket_tainted(csp);
3828 #ifdef FEATURE_HTTPS_INSPECTION
3829                close_client_and_server_ssl_connections(csp);
3830 #endif
3831                return;
3832             }
3833
3834             /* Convert iob into something sed() can digest */
3835             if (JB_ERR_PARSE == get_server_headers(csp))
3836             {
3837                if (ms_iis5_hack)
3838                {
3839                   /*
3840                    * Well, we tried our MS IIS/5 hack and it didn't work.
3841                    * The header is incomplete and there isn't anything
3842                    * we can do about it.
3843                    */
3844                   log_error(LOG_LEVEL_ERROR, "Invalid server headers. "
3845                      "Applying the MS IIS5 hack didn't help.");
3846                   log_error(LOG_LEVEL_CLF,
3847                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3848 #ifdef FEATURE_HTTPS_INSPECTION
3849                   /*
3850                    * Sending data with standard or secured connection (HTTP/HTTPS)
3851                    */
3852                   if (client_use_ssl(csp))
3853                   {
3854                      ssl_send_data_delayed(&(csp->ssl_client_attr),
3855                         (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3856                         strlen(INVALID_SERVER_HEADERS_RESPONSE), get_write_delay(csp));
3857                   }
3858                   else
3859 #endif /* def FEATURE_HTTPS_INSPECTION */
3860                   {
3861                      write_socket_delayed(csp->cfd,
3862                         INVALID_SERVER_HEADERS_RESPONSE,
3863                         strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3864                   }
3865                   mark_server_socket_tainted(csp);
3866 #ifdef FEATURE_HTTPS_INSPECTION
3867                   close_client_and_server_ssl_connections(csp);
3868 #endif
3869                   return;
3870                }
3871                else
3872                {
3873                   /*
3874                    * Since we have to wait for more from the server before
3875                    * we can parse the headers we just continue here.
3876                    */
3877                   log_error(LOG_LEVEL_CONNECT,
3878                      "Continuing buffering server headers from socket %d. "
3879                      "Bytes most recently read: %ld.", csp->cfd, len);
3880                   continue;
3881                }
3882             }
3883             else
3884             {
3885                /*
3886                 * Account for the content bytes we
3887                 * might have gotten with the headers.
3888                 */
3889                assert(csp->iob->eod >= csp->iob->cur);
3890                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
3891             }
3892
3893             /* Did we actually get anything? */
3894             if (NULL == csp->headers->first)
3895             {
3896                if ((csp->flags & CSP_FLAG_REUSED_CLIENT_CONNECTION))
3897                {
3898                   log_error(LOG_LEVEL_ERROR,
3899                      "No server or forwarder response received on socket %d. "
3900                      "Closing client socket %d without sending data.",
3901                      csp->server_connection.sfd, csp->cfd);
3902                   log_error(LOG_LEVEL_CLF,
3903                      "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3904                }
3905                else
3906                {
3907                   log_error(LOG_LEVEL_ERROR,
3908                      "No server or forwarder response received on socket %d.",
3909                      csp->server_connection.sfd);
3910                   send_crunch_response(csp, error_response(csp, "no-server-data"));
3911                }
3912                free_http_request(http);
3913                mark_server_socket_tainted(csp);
3914 #ifdef FEATURE_HTTPS_INSPECTION
3915                close_client_and_server_ssl_connections(csp);
3916 #endif
3917                return;
3918             }
3919
3920             if (!csp->headers->first->str)
3921             {
3922                log_error(LOG_LEVEL_ERROR, "header search: csp->headers->first->str == NULL, assert will be called");
3923             }
3924             assert(csp->headers->first->str);
3925
3926             if (strncmpic(csp->headers->first->str, "HTTP", 4) &&
3927                 strncmpic(csp->headers->first->str, "ICY", 3))
3928             {
3929                /*
3930                 * It doesn't look like a HTTP (or Shoutcast) response:
3931                 * tell the client and log the problem.
3932                 */
3933                if (strlen(csp->headers->first->str) > 30)
3934                {
3935                   csp->headers->first->str[30] = '\0';
3936                }
3937                log_error(LOG_LEVEL_ERROR,
3938                   "Invalid server or forwarder response. Starts with: %s",
3939                   csp->headers->first->str);
3940                log_error(LOG_LEVEL_CLF,
3941                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3942 #ifdef FEATURE_HTTPS_INSPECTION
3943                /*
3944                 * Sending data with standard or secured connection (HTTP/HTTPS)
3945                 */
3946                if (client_use_ssl(csp))
3947                {
3948                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3949                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3950                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3951                      get_write_delay(csp));
3952                }
3953                else
3954 #endif /* def FEATURE_HTTPS_INSPECTION */
3955                {
3956                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
3957                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
3958                }
3959                free_http_request(http);
3960                mark_server_socket_tainted(csp);
3961 #ifdef FEATURE_HTTPS_INSPECTION
3962                close_client_and_server_ssl_connections(csp);
3963 #endif
3964                return;
3965             }
3966
3967             /*
3968              * Disable redirect checkers, so that they will be only run
3969              * again if the user also enables them through tags.
3970              *
3971              * From a performance point of view it doesn't matter,
3972              * but it prevents duplicated log messages.
3973              */
3974 #ifdef FEATURE_FAST_REDIRECTS
3975             csp->action->flags &= ~ACTION_FAST_REDIRECTS;
3976 #endif
3977             csp->action->flags &= ~ACTION_REDIRECT;
3978
3979             /*
3980              * We have now received the entire server header,
3981              * filter it and send the result to the client
3982              */
3983             if (JB_ERR_OK != sed(csp, FILTER_SERVER_HEADERS))
3984             {
3985                log_error(LOG_LEVEL_CLF,
3986                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
3987 #ifdef FEATURE_HTTPS_INSPECTION
3988                /*
3989                 * Sending data with standard or secured connection (HTTP/HTTPS)
3990                 */
3991                if (client_use_ssl(csp))
3992                {
3993                   ssl_send_data_delayed(&(csp->ssl_client_attr),
3994                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
3995                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
3996                      get_write_delay(csp));
3997                }
3998                else
3999 #endif
4000                {
4001                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4002                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4003                }
4004                free_http_request(http);
4005                mark_server_socket_tainted(csp);
4006 #ifdef FEATURE_HTTPS_INSPECTION
4007                close_client_and_server_ssl_connections(csp);
4008 #endif
4009                return;
4010             }
4011             hdr = list_to_text(csp->headers);
4012             if (hdr == NULL)
4013             {
4014                /* FIXME Should handle error properly */
4015                log_error(LOG_LEVEL_FATAL, "Out of memory parsing server header");
4016             }
4017
4018             if ((csp->flags & CSP_FLAG_CHUNKED)
4019                && !(csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4020                && ((csp->iob->eod - csp->iob->cur) >= 5)
4021                && !memcmp(csp->iob->eod-5, "0\r\n\r\n", 5))
4022             {
4023                log_error(LOG_LEVEL_CONNECT,
4024                   "Looks like we got the last chunk together with "
4025                   "the server headers. We better stop reading.");
4026                byte_count = (unsigned long long)(csp->iob->eod - csp->iob->cur);
4027                csp->expected_content_length = byte_count;
4028                csp->flags |= CSP_FLAG_CONTENT_LENGTH_SET;
4029             }
4030
4031             csp->server_connection.response_received = time(NULL);
4032
4033             if (crunch_response_triggered(csp, crunchers_light))
4034             {
4035                /*
4036                 * One of the tags created by a server-header
4037                 * tagger triggered a crunch. We already
4038                 * delivered the crunch response to the client
4039                 * and are done here after cleaning up.
4040                 */
4041                freez(hdr);
4042                mark_server_socket_tainted(csp);
4043 #ifdef FEATURE_HTTPS_INSPECTION
4044                close_client_and_server_ssl_connections(csp);
4045 #endif
4046                return;
4047             }
4048
4049             /* Buffer and pcrs filter this if appropriate. */
4050             buffer_and_filter_content = content_requires_filtering(csp);
4051
4052             if (!buffer_and_filter_content)
4053             {
4054                /*
4055                 * Write the server's (modified) header to
4056                 * the client (along with anything else that
4057                 * may be in the buffer). Use standard or secured
4058                 * connection.
4059                 */
4060 #ifdef FEATURE_HTTPS_INSPECTION
4061                if (client_use_ssl(csp))
4062                {
4063                   if ((ssl_send_data_delayed(&(csp->ssl_client_attr),
4064                           (const unsigned char *)hdr, strlen(hdr),
4065                           get_write_delay(csp)) < 0)
4066                      || ((len = ssl_flush_socket(&(csp->ssl_client_attr),
4067                             csp->iob)) < 0))
4068                   {
4069                      log_error(LOG_LEVEL_CONNECT, "Write header to client failed");
4070
4071                      /*
4072                       * The write failed, so don't bother mentioning it
4073                       * to the client... it probably can't hear us anyway.
4074                       */
4075                      freez(hdr);
4076                      mark_server_socket_tainted(csp);
4077 #ifdef FEATURE_HTTPS_INSPECTION
4078                      close_client_and_server_ssl_connections(csp);
4079 #endif
4080                      return;
4081                   }
4082                }
4083                else
4084 #endif /* def FEATURE_HTTPS_INSPECTION */
4085                {
4086                   if (write_socket_delayed(csp->cfd, hdr, strlen(hdr), write_delay)
4087                      || ((len = flush_iob(csp->cfd, csp->iob, write_delay)) < 0))
4088                   {
4089                      log_error(LOG_LEVEL_ERROR,
4090                         "write header to client failed");
4091                      /*
4092                       * The write failed, so don't bother mentioning it
4093                       * to the client... it probably can't hear us anyway.
4094                       */
4095                      freez(hdr);
4096                      mark_server_socket_tainted(csp);
4097                      return;
4098                   }
4099                }
4100                                 }
4101
4102             /* we're finished with the server's header */
4103
4104             freez(hdr);
4105             server_body = 1;
4106
4107             /*
4108              * If this was a MS IIS/5 hack then it means the server
4109              * has already closed the connection. Nothing more to read.
4110              * Time to bail.
4111              */
4112             if (ms_iis5_hack)
4113             {
4114                log_error(LOG_LEVEL_ERROR,
4115                   "Closed server connection detected. "
4116                   "Applying the MS IIS5 hack didn't help.");
4117                log_error(LOG_LEVEL_CLF,
4118                   "%s - - [%T] \"%s\" 502 0", csp->ip_addr_str, http->cmd);
4119 #ifdef FEATURE_HTTPS_INSPECTION
4120                /*
4121                 * Sending data with standard or secured connection (HTTP/HTTPS)
4122                 */
4123                if (client_use_ssl(csp))
4124                {
4125                   ssl_send_data_delayed(&(csp->ssl_client_attr),
4126                      (const unsigned char *)INVALID_SERVER_HEADERS_RESPONSE,
4127                      strlen(INVALID_SERVER_HEADERS_RESPONSE),
4128                      get_write_delay(csp));
4129                }
4130                else
4131 #endif /* def FEATURE_HTTPS_INSPECTION */
4132                {
4133                   write_socket_delayed(csp->cfd, INVALID_SERVER_HEADERS_RESPONSE,
4134                      strlen(INVALID_SERVER_HEADERS_RESPONSE), write_delay);
4135                }
4136                mark_server_socket_tainted(csp);
4137 #ifdef FEATURE_HTTPS_INSPECTION
4138                close_client_and_server_ssl_connections(csp);
4139 #endif
4140                return;
4141             }
4142          }
4143          continue;
4144       }
4145       mark_server_socket_tainted(csp);
4146 #ifdef FEATURE_HTTPS_INSPECTION
4147       close_client_and_server_ssl_connections(csp);
4148 #endif
4149       return; /* huh? we should never get here */
4150    }
4151
4152    if (csp->content_length == 0)
4153    {
4154       /*
4155        * If Privoxy didn't recalculate the Content-Length,
4156        * byte_count is still correct.
4157        */
4158       csp->content_length = byte_count;
4159    }
4160
4161 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4162    if ((csp->flags & CSP_FLAG_CONTENT_LENGTH_SET)
4163       && (csp->expected_content_length != byte_count))
4164    {
4165       log_error(LOG_LEVEL_CONNECT,
4166          "Received %llu bytes while expecting %llu.",
4167          byte_count, csp->expected_content_length);
4168       mark_server_socket_tainted(csp);
4169    }
4170 #endif
4171
4172 #ifdef FEATURE_HTTPS_INSPECTION
4173    if (client_use_ssl(csp))
4174    {
4175       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s https://%s%s %s\" 200 %llu",
4176          csp->ip_addr_str, http->gpc, http->hostport, http->path,
4177          http->version, csp->content_length);
4178    }
4179    else
4180 #endif
4181    {
4182       log_error(LOG_LEVEL_CLF, "%s - - [%T] \"%s\" 200 %llu",
4183          csp->ip_addr_str, http->ocmd, csp->content_length);
4184    }
4185    csp->server_connection.timestamp = time(NULL);
4186 }
4187
4188
4189 /*********************************************************************
4190  *
4191  * Function    :  chat
4192  *
4193  * Description :  Once a connection from the client has been accepted,
4194  *                this function is called (via serve()) to handle the
4195  *                main business of the communication.  This function
4196  *                returns after dealing with a single request. It can
4197  *                be called multiple times with the same client socket
4198  *                if the client is keeping the connection alive.
4199  *
4200  *                The decision whether or not a client connection will
4201  *                be kept alive is up to the caller which also must
4202  *                close the client socket when done.
4203  *
4204  *                FIXME: chat is nearly thousand lines long.
4205  *                Ridiculous.
4206  *
4207  * Parameters  :
4208  *          1  :  csp = Current client state (buffers, headers, etc...)
4209  *
4210  * Returns     :  Nothing.
4211  *
4212  *********************************************************************/
4213 static void chat(struct client_state *csp)
4214 {
4215    const struct forward_spec *fwd;
4216    struct http_request *http;
4217    /* Skeleton for HTTP response, if we should intercept the request */
4218    struct http_response *rsp;
4219 #ifdef FEATURE_HTTPS_INSPECTION
4220    int use_ssl_tunnel = 0;
4221 #endif
4222
4223    http = csp->http;
4224
4225    if (receive_client_request(csp) != JB_ERR_OK)
4226    {
4227       return;
4228    }
4229
4230 #if defined(FEATURE_STATISTICS) && defined(MUTEX_LOCKS_AVAILABLE)
4231    privoxy_mutex_lock(&block_statistics_mutex);
4232    number_of_requests_received++;
4233    privoxy_mutex_unlock(&block_statistics_mutex);
4234 #endif
4235
4236    if (parse_client_request(csp) != JB_ERR_OK)
4237    {
4238       return;
4239    }
4240
4241 #ifdef FEATURE_HTTPS_INSPECTION
4242    /*
4243     * Setting flags to use old solution with SSL tunnel and to disable
4244     * certificate verification.
4245     */
4246    if (csp->http->ssl && !(csp->action->flags & ACTION_HTTPS_INSPECTION)
4247       && !cgi_page_requested(csp->http->host))
4248    {
4249       use_ssl_tunnel = 1;
4250    }
4251
4252    if (http->ssl && (csp->action->flags & ACTION_IGNORE_CERTIFICATE_ERRORS))
4253    {
4254       csp->dont_verify_certificate = 1;
4255    }
4256 #endif
4257
4258    /*
4259     * build the http request to send to the server
4260     * we have to do one of the following:
4261     *
4262     * create =    use the original HTTP request to create a new
4263     *             HTTP request that has either the path component
4264     *             without the http://domainspec (w/path) or the
4265     *             full orininal URL (w/url)
4266     *             Note that the path and/or the HTTP version may
4267     *             have been altered by now.
4268     *
4269     * SSL proxy = Open a socket to the host:port of the server
4270     *             and create TLS/SSL connection with server and
4271     *             with client. Then behave like mediator between
4272     *             client and server over TLS/SSL.
4273     *
4274     * SSL proxy = Pass the request unchanged if forwarding a CONNECT
4275     *    with     request to a parent proxy. Note that we'll be sending
4276     * forwarding  the CFAIL message ourselves if connecting to the parent
4277     *             fails, but we won't send a CSUCCEED message if it works,
4278     *             since that would result in a double message (ours and the
4279     *             parent's). After sending the request to the parent, we
4280     *             must parse answer and send it to client. If connection
4281     *             with server is established, we do TLS/SSL proxy. Otherwise
4282     *             we send parent response to client and close connections.
4283     *
4284     * here's the matrix:
4285     *                        SSL
4286     *                    0        1
4287     *                +--------+--------+
4288     *                |        |        |
4289     *             0  | create |   SSL  |
4290     *                | w/path |  proxy |
4291     *  Forwarding    +--------+--------+
4292     *                |        |   SSL  |
4293     *             1  | create |  proxy |
4294     *                | w/url  |+forward|
4295     *                +--------+--------+
4296     *
4297     */
4298
4299 #ifdef FEATURE_HTTPS_INSPECTION
4300    /*
4301     * Presetting SSL client and server flags
4302     */
4303    if (http->ssl && !use_ssl_tunnel)
4304    {
4305       http->client_ssl = 1;
4306       http->server_ssl = 1;
4307    }
4308    else
4309    {
4310       http->client_ssl = 0;
4311       http->server_ssl = 0;
4312    }
4313 #endif
4314
4315 #ifdef FEATURE_HTTPS_INSPECTION
4316    /*
4317     * Log the request unless we're https inspecting
4318     * in which case we don't have the path yet and
4319     * will log the request later.
4320     */
4321    if (!client_use_ssl(csp))
4322 #endif
4323    {
4324       log_error(LOG_LEVEL_REQUEST, "%s%s", http->hostport, http->path);
4325    }
4326
4327    if (http->ssl && connect_port_is_forbidden(csp))
4328    {
4329       const char *acceptable_connect_ports =
4330          csp->action->string[ACTION_STRING_LIMIT_CONNECT];
4331       assert(NULL != acceptable_connect_ports);
4332       log_error(LOG_LEVEL_INFO, "Request from %s marked for blocking. "
4333          "limit-connect{%s} doesn't allow CONNECT requests to %s",
4334          csp->ip_addr_str, acceptable_connect_ports, csp->http->hostport);
4335       csp->action->flags |= ACTION_BLOCK;
4336       http->ssl = 0;
4337 #ifdef FEATURE_HTTPS_INSPECTION
4338       http->client_ssl = 0;
4339       http->server_ssl = 0;
4340 #endif
4341    }
4342
4343    /*
4344     * We have a request. Check if one of the crunchers wants it
4345     * unless the client wants to use TLS/SSL in which case we
4346     * haven't setup the TLS context yet and will send the crunch
4347     * response later.
4348     */
4349    if (
4350 #ifdef FEATURE_HTTPS_INSPECTION
4351        !client_use_ssl(csp) &&
4352 #endif
4353        crunch_response_triggered(csp, crunchers_all))
4354    {
4355       /*
4356        * Yes. The client got the crunch response and we're done here.
4357        */
4358       return;
4359    }
4360
4361 #ifdef FEATURE_HTTPS_INSPECTION
4362    if (client_use_ssl(csp) && !use_ssl_tunnel)
4363    {
4364       int ret;
4365       /*
4366        * Creating a SSL proxy.
4367        *
4368        * By sending the CSUCCEED message we're lying to the client as
4369        * the connection hasn't actually been established yet. We don't
4370        * establish the connection until we have seen and parsed the
4371        * encrypted client headers.
4372        */
4373       if (write_socket_delayed(csp->cfd, CSUCCEED,
4374             strlen(CSUCCEED), get_write_delay(csp)) != 0)
4375       {
4376          log_error(LOG_LEVEL_ERROR, "Sending SUCCEED to client failed");
4377          return;
4378       }
4379
4380       ret = create_client_ssl_connection(csp);
4381       if (ret != 0)
4382       {
4383          log_error(LOG_LEVEL_ERROR,
4384             "Failed to open a secure connection with the client");
4385          return;
4386       }
4387       if (JB_ERR_OK != process_encrypted_request_headers(csp))
4388       {
4389          close_client_ssl_connection(csp);
4390          return;
4391       }
4392       /*
4393        * We have an encrypted request. Check if one of the crunchers now
4394        * wants it (for example because the previously invisible path was
4395        * required to match).
4396        */
4397       if (crunch_response_triggered(csp, crunchers_all))
4398       {
4399          /*
4400           * Yes. The client got the crunch response and we're done here.
4401           */
4402          return;
4403       }
4404    }
4405 #endif
4406
4407    log_applied_actions(csp->action);
4408
4409    /* decide how to route the HTTP request */
4410    fwd = forward_url(csp, http);
4411
4412    freez(csp->headers->first->str);
4413    build_request_line(csp, fwd, &csp->headers->first->str);
4414
4415    if (fwd->forward_host)
4416    {
4417       log_error(LOG_LEVEL_CONNECT, "via [%s]:%d to: %s",
4418          fwd->forward_host, fwd->forward_port, http->hostport);
4419    }
4420    else
4421    {
4422       log_error(LOG_LEVEL_CONNECT, "to %s", http->hostport);
4423    }
4424
4425    /* here we connect to the server, gateway, or the forwarder */
4426
4427 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4428    if ((csp->server_connection.sfd != JB_INVALID_SOCKET)
4429       && socket_is_still_alive(csp->server_connection.sfd)
4430       && connection_destination_matches(&csp->server_connection, http, fwd))
4431    {
4432       log_error(LOG_LEVEL_CONNECT,
4433          "Reusing server socket %d connected to %s. Total requests: %u.",
4434          csp->server_connection.sfd, csp->server_connection.host,
4435          csp->server_connection.requests_sent_total);
4436    }
4437    else
4438    {
4439       if (csp->server_connection.sfd != JB_INVALID_SOCKET)
4440       {
4441 #ifdef FEATURE_CONNECTION_SHARING
4442          if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING
4443 #ifdef FEATURE_HTTPS_INSPECTION
4444             && !server_use_ssl(csp)
4445 #endif
4446             )
4447          {
4448             remember_connection(&csp->server_connection);
4449          }
4450          else
4451 #endif /* def FEATURE_CONNECTION_SHARING */
4452          {
4453             log_error(LOG_LEVEL_CONNECT,
4454                "Closing server socket %d connected to %s. Total requests: %u.",
4455                csp->server_connection.sfd, csp->server_connection.host,
4456                csp->server_connection.requests_sent_total);
4457             close_socket(csp->server_connection.sfd);
4458          }
4459          mark_connection_closed(&csp->server_connection);
4460       }
4461 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4462
4463       /*
4464        * Connecting to destination server
4465        */
4466       csp->server_connection.sfd = forwarded_connect(fwd, http, csp);
4467
4468       if (csp->server_connection.sfd == JB_INVALID_SOCKET)
4469       {
4470          if (fwd->type != SOCKS_NONE)
4471          {
4472             /* Socks error. */
4473             rsp = error_response(csp, "forwarding-failed");
4474          }
4475          else if (errno == EINVAL)
4476          {
4477             rsp = error_response(csp, "no-such-domain");
4478          }
4479          else
4480          {
4481             rsp = error_response(csp, "connect-failed");
4482          }
4483
4484          /* Write the answer to the client */
4485          if (rsp != NULL)
4486          {
4487             send_crunch_response(csp, rsp);
4488          }
4489
4490          /*
4491           * Temporary workaround to prevent already-read client
4492           * bodies from being parsed as new requests. For now we
4493           * err on the safe side and throw all the following
4494           * requests under the bus, even if no client body has been
4495           * buffered. A compliant client will repeat the dropped
4496           * requests on an untainted connection.
4497           *
4498           * The proper fix is to discard the no longer needed
4499           * client body in the buffer (if there is one) and to
4500           * continue parsing the bytes that follow.
4501           */
4502 #ifdef FEATURE_HTTPS_INSPECTION
4503          close_client_ssl_connection(csp);
4504 #endif
4505          drain_and_close_socket(csp->cfd);
4506          csp->cfd = JB_INVALID_SOCKET;
4507
4508          return;
4509       }
4510
4511 #ifdef FEATURE_HTTPS_INSPECTION
4512       /*
4513        * Creating TLS/SSL connections with destination server or parent
4514        * proxy. If forwarding is enabled, we must send client request to
4515        * parent proxy and receive, parse and resend parent proxy answer.
4516        */
4517       if (http->ssl && !use_ssl_tunnel)
4518       {
4519          if (fwd->forward_host != NULL)
4520          {
4521             char server_response[BUFFER_SIZE];
4522             int ret = 0;
4523             int len = 0;
4524             char *hdr = list_to_text(csp->headers);
4525             memset(server_response, 0, sizeof(server_response));
4526
4527             if (hdr == NULL)
4528             {
4529                log_error(LOG_LEVEL_FATAL,
4530                   "Out of memory parsing client header");
4531             }
4532             list_remove_all(csp->headers);
4533
4534             /*
4535              * Sending client's CONNECT request to the parent proxy
4536              */
4537             ret = write_socket(csp->server_connection.sfd, hdr, strlen(hdr));
4538
4539             freez(hdr);
4540
4541             if (ret != 0)
4542             {
4543                log_error(LOG_LEVEL_CONNECT,
4544                   "Sending request headers to: %s failed", http->hostport);
4545                mark_server_socket_tainted(csp);
4546                close_client_ssl_connection(csp);
4547                return;
4548             }
4549
4550             /* Waiting for parent proxy server response */
4551             len = read_socket(csp->server_connection.sfd, server_response,
4552                sizeof(server_response)-1);
4553
4554             if (len <= 0)
4555             {
4556                log_error(LOG_LEVEL_ERROR, "No response from parent proxy "
4557                   "server on socket %d.", csp->server_connection.sfd);
4558
4559                rsp = error_response(csp, "no-server-data");
4560                if (rsp)
4561                {
4562                   send_crunch_response(csp, rsp);
4563                }
4564                mark_server_socket_tainted(csp);
4565                close_client_ssl_connection(csp);
4566                return;
4567             }
4568
4569             /*
4570              * Test if the connection to the destination server was
4571              * established successfully by the parent proxy.
4572              */
4573             if (!tunnel_established_successfully(server_response, (unsigned int)len))
4574             {
4575                log_error(LOG_LEVEL_ERROR,
4576                   "The forwarder %s failed to establish a connection with %s",
4577                   fwd->forward_host, http->host);
4578                rsp = error_response(csp, "connect-failed");
4579                if (rsp)
4580                {
4581                   send_crunch_response(csp, rsp);
4582                }
4583                mark_server_socket_tainted(csp);
4584                close_client_ssl_connection(csp);
4585                return;
4586             }
4587          } /* -END- if (fwd->forward_host != NULL) */
4588
4589          /*
4590           * We can now create the TLS/SSL connection with the destination server.
4591           */
4592          int ret = create_server_ssl_connection(csp);
4593          if (ret != 0)
4594          {
4595             if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4596                 csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4597             {
4598                /*
4599                 * If the server certificate is invalid, we must inform
4600                 * the client and then close connection to the client.
4601                 */
4602                ssl_send_certificate_error(csp);
4603                close_client_and_server_ssl_connections(csp);
4604                return;
4605             }
4606             if (csp->server_cert_verification_result == SSL_CERT_NOT_VERIFIED
4607              || csp->server_cert_verification_result == SSL_CERT_VALID)
4608             {
4609                /*
4610                 * The TLS/SSL connection wasn't created but an invalid
4611                 * certificate wasn't detected. Report it as connection
4612                 * failure.
4613                 */
4614                rsp = error_response(csp, "connect-failed");
4615                if (rsp)
4616                {
4617                   send_crunch_response(csp, rsp);
4618                }
4619                close_client_and_server_ssl_connections(csp);
4620                return;
4621             }
4622          }
4623       }/* -END- if (http->ssl) */
4624 #endif /* def FEATURE_HTTPS_INSPECTION */
4625
4626 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4627       save_connection_destination(csp->server_connection.sfd,
4628          http, fwd, &csp->server_connection);
4629       csp->server_connection.keep_alive_timeout =
4630          (unsigned)csp->config->keep_alive_timeout;
4631    }
4632 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4633
4634    csp->server_connection.requests_sent_total++;
4635
4636    if ((fwd->type == SOCKS_5T) && (NULL == csp->headers->first))
4637    {
4638       /* Client headers have been sent optimistically */
4639       assert(csp->headers->last == NULL);
4640    }
4641    else if (http->ssl == 0 || (fwd->forward_host
4642 #ifdef FEATURE_HTTPS_INSPECTION
4643          && use_ssl_tunnel
4644 #endif
4645            ))
4646    {
4647       if (send_http_request(csp))
4648       {
4649          rsp = error_response(csp, "connect-failed");
4650          if (rsp)
4651          {
4652             send_crunch_response(csp, rsp);
4653          }
4654          return;
4655       }
4656    }
4657    else
4658    {
4659       /*
4660        * Using old solution with SSL tunnel or new solution with SSL proxy
4661        */
4662       list_remove_all(csp->headers);
4663 #ifdef FEATURE_HTTPS_INSPECTION
4664       if (use_ssl_tunnel)
4665 #endif
4666       {
4667          /*
4668          * We're running an SSL tunnel and we're not forwarding,
4669          * so just ditch the client headers, send the "connect succeeded"
4670          * message to the client, flush the rest, and get out of the way.
4671          */
4672          if (write_socket_delayed(csp->cfd, CSUCCEED,
4673                strlen(CSUCCEED), get_write_delay(csp)))
4674          {
4675             return;
4676          }
4677       }
4678 #ifdef FEATURE_HTTPS_INSPECTION
4679       else
4680       {
4681          /*
4682           * If server certificate has been verified and is invalid,
4683           * we must inform the client and then close the connection
4684           * with client and server.
4685           */
4686          if (csp->server_cert_verification_result != SSL_CERT_VALID &&
4687              csp->server_cert_verification_result != SSL_CERT_NOT_VERIFIED)
4688          {
4689             ssl_send_certificate_error(csp);
4690             close_client_and_server_ssl_connections(csp);
4691             return;
4692          }
4693          if (send_https_request(csp))
4694          {
4695             rsp = error_response(csp, "connect-failed");
4696             if (rsp)
4697             {
4698                send_crunch_response(csp, rsp);
4699             }
4700             close_client_and_server_ssl_connections(csp);
4701             return;
4702          }
4703       }
4704 #endif /* def FEATURE_HTTPS_INSPECTION */
4705       clear_iob(csp->client_iob);
4706    }/* -END- else ... if (http->ssl == 1) */
4707
4708    log_error(LOG_LEVEL_CONNECT, "to %s successful", http->hostport);
4709
4710    /* XXX: should the time start earlier for optimistically sent data? */
4711    csp->server_connection.request_sent = time(NULL);
4712
4713    handle_established_connection(csp);
4714    freez(csp->receive_buffer);
4715 }
4716
4717
4718 #ifdef FUZZ
4719 /*********************************************************************
4720  *
4721  * Function    :  fuzz_server_response
4722  *
4723  * Description :  Treat the input as a whole server response.
4724  *
4725  * Parameters  :
4726  *          1  :  csp = Current client state (buffers, headers, etc...)
4727  *          2  :  fuzz_input_file = File to read the input from.
4728  *
4729  * Returns     :  0
4730  *
4731  *********************************************************************/
4732 extern int fuzz_server_response(struct client_state *csp, char *fuzz_input_file)
4733 {
4734    static struct forward_spec fwd; /* Zero'd due to being static */
4735    csp->cfd = 0;
4736
4737    if (strcmp(fuzz_input_file, "-") == 0)
4738    {
4739       /* XXX: Doesn't work yet. */
4740       csp->server_connection.sfd = 0;
4741    }
4742    else
4743    {
4744       csp->server_connection.sfd = open(fuzz_input_file, O_RDONLY);
4745       if (csp->server_connection.sfd == -1)
4746       {
4747          log_error(LOG_LEVEL_FATAL, "Failed to open %s: %E",
4748             fuzz_input_file);
4749       }
4750    }
4751    csp->fwd = &fwd;
4752    csp->content_type |= CT_GIF;
4753    csp->action->flags |= ACTION_DEANIMATE;
4754    csp->action->string[ACTION_STRING_DEANIMATE] = "last";
4755
4756    csp->http->path = strdup_or_die("/");
4757    csp->http->host = strdup_or_die("fuzz.example.org");
4758    csp->http->hostport = strdup_or_die("fuzz.example.org:80");
4759    /* Prevent client socket monitoring */
4760    csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4761    csp->flags |= CSP_FLAG_CHUNKED;
4762
4763    csp->config->feature_flags |= RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE;
4764    csp->flags |= CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4765
4766    csp->content_type |= CT_DECLARED|CT_GIF;
4767
4768    csp->config->socket_timeout = 0;
4769
4770    cgi_init_error_messages();
4771
4772    handle_established_connection(csp);
4773    freez(csp->receive_buffer);
4774
4775    return 0;
4776 }
4777 #endif
4778
4779
4780 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4781 /*********************************************************************
4782  *
4783  * Function    :  prepare_csp_for_next_request
4784  *
4785  * Description :  Put the csp in a mostly vergin state.
4786  *
4787  * Parameters  :
4788  *          1  :  csp = Current client state (buffers, headers, etc...)
4789  *
4790  * Returns     :  N/A
4791  *
4792  *********************************************************************/
4793 static void prepare_csp_for_next_request(struct client_state *csp)
4794 {
4795    csp->content_type = 0;
4796    csp->content_length = 0;
4797    csp->expected_content_length = 0;
4798    csp->expected_client_content_length = 0;
4799    list_remove_all(csp->headers);
4800    clear_iob(csp->iob);
4801    freez(csp->error_message);
4802    free_http_request(csp->http);
4803    destroy_list(csp->headers);
4804 #ifdef FEATURE_HTTPS_INSPECTION
4805    destroy_list(csp->https_headers);
4806 #endif
4807    destroy_list(csp->tags);
4808 #ifdef FEATURE_CLIENT_TAGS
4809    destroy_list(csp->client_tags);
4810    freez(csp->client_address);
4811 #endif
4812    free_current_action(csp->action);
4813    if (NULL != csp->fwd)
4814    {
4815       unload_forward_spec(csp->fwd);
4816       csp->fwd = NULL;
4817    }
4818    /* XXX: Store per-connection flags someplace else. */
4819    csp->flags = (CSP_FLAG_ACTIVE | CSP_FLAG_REUSED_CLIENT_CONNECTION);
4820 #ifdef FEATURE_TOGGLE
4821    if (global_toggle_state)
4822 #endif /* def FEATURE_TOGGLE */
4823    {
4824       csp->flags |= CSP_FLAG_TOGGLED_ON;
4825    }
4826
4827    if (csp->client_iob->eod > csp->client_iob->cur)
4828    {
4829       long bytes_to_shift = csp->client_iob->cur - csp->client_iob->buf;
4830       size_t data_length  = (size_t)(csp->client_iob->eod - csp->client_iob->cur);
4831
4832       assert(bytes_to_shift > 0);
4833       assert(data_length > 0);
4834
4835       log_error(LOG_LEVEL_CONNECT, "Shifting %lu pipelined bytes by %ld bytes",
4836          data_length, bytes_to_shift);
4837       memmove(csp->client_iob->buf, csp->client_iob->cur, data_length);
4838       csp->client_iob->cur = csp->client_iob->buf;
4839       assert(csp->client_iob->eod == csp->client_iob->buf + bytes_to_shift + data_length);
4840       csp->client_iob->eod = csp->client_iob->buf + data_length;
4841       memset(csp->client_iob->eod, '\0', (size_t)bytes_to_shift);
4842
4843       csp->flags |= CSP_FLAG_PIPELINED_REQUEST_WAITING;
4844    }
4845    else
4846    {
4847       /*
4848        * We mainly care about resetting client_iob->cur so we don't
4849        * waste buffer space at the beginning and don't mess up the
4850        * request restoration done by cgi_show_request().
4851        *
4852        * Freeing the buffer itself isn't technically necessary,
4853        * but makes debugging more convenient.
4854        */
4855       clear_iob(csp->client_iob);
4856    }
4857 }
4858 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
4859
4860
4861 /*********************************************************************
4862  *
4863  * Function    :  serve
4864  *
4865  * Description :  This is little more than chat.  We only "serve" to
4866  *                to close (or remember) any socket that chat may have
4867  *                opened.
4868  *
4869  * Parameters  :
4870  *          1  :  csp = Current client state (buffers, headers, etc...)
4871  *
4872  * Returns     :  N/A
4873  *
4874  *********************************************************************/
4875 static void serve(struct client_state *csp)
4876 {
4877    int config_file_change_detected = 0; /* Only used for debugging */
4878 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
4879 #ifdef FEATURE_CONNECTION_SHARING
4880    static int monitor_thread_running = 0;
4881 #endif /* def FEATURE_CONNECTION_SHARING */
4882    int continue_chatting = 0;
4883
4884    log_error(LOG_LEVEL_CONNECT, "Accepted connection from %s on socket %d",
4885       csp->ip_addr_str, csp->cfd);
4886
4887    do
4888    {
4889       unsigned int latency;
4890
4891 #ifdef FEATURE_HTTPS_INSPECTION
4892       if (continue_chatting && client_use_ssl(csp))
4893       {
4894          continue_https_chat(csp);
4895       }
4896       else
4897 #endif
4898       {
4899          chat(csp);
4900       }
4901
4902       /*
4903        * If the request has been crunched,
4904        * the calculated latency is zero.
4905        */
4906       latency = (unsigned)(csp->server_connection.response_received -
4907          csp->server_connection.request_sent) / 2;
4908
4909       if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4910          && (csp->flags & CSP_FLAG_CRUNCHED)
4911          && (csp->expected_client_content_length != 0))
4912       {
4913          csp->flags |= CSP_FLAG_SERVER_SOCKET_TAINTED;
4914          log_error(LOG_LEVEL_CONNECT,
4915             "Tainting client socket %d due to unread data.", csp->cfd);
4916       }
4917
4918       continue_chatting = (csp->config->feature_flags
4919          & RUNTIME_FEATURE_CONNECTION_KEEP_ALIVE)
4920          && !(csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4921          && (csp->cfd != JB_INVALID_SOCKET)
4922          && (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
4923          && ((csp->flags & CSP_FLAG_SERVER_CONTENT_LENGTH_SET)
4924             || (csp->flags & CSP_FLAG_CHUNKED));
4925
4926       if (!(csp->flags & CSP_FLAG_CRUNCHED)
4927          && (csp->server_connection.sfd != JB_INVALID_SOCKET))
4928       {
4929          if (!(csp->flags & CSP_FLAG_SERVER_KEEP_ALIVE_TIMEOUT_SET))
4930          {
4931             csp->server_connection.keep_alive_timeout = csp->config->default_server_timeout;
4932          }
4933          if (!(csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE)
4934             || (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED)
4935             || !socket_is_still_alive(csp->server_connection.sfd)
4936             || !(latency < csp->server_connection.keep_alive_timeout))
4937          {
4938             log_error(LOG_LEVEL_CONNECT,
4939                "Closing server socket %d connected to %s. "
4940                "Keep-alive: %u. Tainted: %u. Socket alive: %u. Timeout: %u.",
4941                csp->server_connection.sfd, (csp->server_connection.host != NULL) ?
4942                csp->server_connection.host : csp->http->host,
4943                0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
4944                0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
4945                socket_is_still_alive(csp->server_connection.sfd),
4946                csp->server_connection.keep_alive_timeout);
4947 #ifdef FEATURE_CONNECTION_SHARING
4948             if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
4949             {
4950                forget_connection(csp->server_connection.sfd);
4951             }
4952 #endif /* def FEATURE_CONNECTION_SHARING */
4953 #ifdef FEATURE_HTTPS_INSPECTION
4954             close_server_ssl_connection(csp);
4955 #endif
4956             close_socket(csp->server_connection.sfd);
4957             mark_connection_closed(&csp->server_connection);
4958 #ifdef FEATURE_HTTPS_INSPECTION
4959             if (continue_chatting && client_use_ssl(csp))
4960             {
4961                /*
4962                 * Close the client socket as well as Privoxy currently
4963                 * can't establish a new server connection when the client
4964                 * socket is reused and would drop the connection in
4965                 * continue_https_chat() anyway.
4966                 */
4967                continue_chatting = 0;
4968                csp->flags &= ~CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE;
4969                log_error(LOG_LEVEL_CONNECT,
4970                   "Client socket %d is no longer usable. "
4971                   "The server socket has been closed.", csp->cfd);
4972             }
4973 #endif
4974          }
4975       }
4976
4977       if (continue_chatting && any_loaded_file_changed(csp))
4978       {
4979          continue_chatting = 0;
4980          config_file_change_detected = 1;
4981       }
4982 #ifdef FEATURE_HTTPS_INSPECTION
4983       if (continue_chatting && client_use_ssl(csp) &&
4984          csp->ssl_with_client_is_opened == 0)
4985       {
4986          continue_chatting = 0;
4987          log_error(LOG_LEVEL_CONNECT, "Client socket %d is no longer usable. "
4988             "The TLS session has been terminated.", csp->cfd);
4989       }
4990 #endif
4991
4992       if (continue_chatting)
4993       {
4994          if (((csp->flags & CSP_FLAG_PIPELINED_REQUEST_WAITING) != 0)
4995             && socket_is_still_alive(csp->cfd))
4996          {
4997             log_error(LOG_LEVEL_CONNECT, "Client request %d has been "
4998                "pipelined on socket %d and the socket is still alive.",
4999                csp->requests_received_total+1, csp->cfd);
5000             prepare_csp_for_next_request(csp);
5001             continue;
5002          }
5003
5004          if (0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE))
5005          {
5006             if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5007             {
5008                log_error(LOG_LEVEL_CONNECT,
5009                   "Waiting for the next client request on socket %d. "
5010                   "Keeping the server socket %d to %s open.",
5011                   csp->cfd, csp->server_connection.sfd, csp->server_connection.host);
5012             }
5013             else
5014             {
5015                log_error(LOG_LEVEL_CONNECT,
5016                   "Waiting for the next client request on socket %d. "
5017                   "No server socket to keep open.", csp->cfd);
5018             }
5019          }
5020
5021          if ((csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE)
5022             && data_is_available(csp->cfd, (int)csp->config->keep_alive_timeout)
5023             && socket_is_still_alive(csp->cfd))
5024          {
5025             log_error(LOG_LEVEL_CONNECT,
5026                "Data arrived in time on client socket %d. Requests so far: %u",
5027                csp->cfd, csp->requests_received_total);
5028             prepare_csp_for_next_request(csp);
5029          }
5030          else
5031          {
5032 #ifdef FEATURE_CONNECTION_SHARING
5033             if ((csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5034                && (csp->server_connection.sfd != JB_INVALID_SOCKET)
5035                && (socket_is_still_alive(csp->server_connection.sfd))
5036 #ifdef FEATURE_HTTPS_INSPECTION
5037                && !server_use_ssl(csp)
5038 #endif
5039                 )
5040             {
5041                time_t time_open = time(NULL) - csp->server_connection.timestamp;
5042
5043                if (csp->server_connection.keep_alive_timeout < time_open - (time_t)latency)
5044                {
5045                   break;
5046                }
5047
5048                remember_connection(&csp->server_connection);
5049                csp->server_connection.sfd = JB_INVALID_SOCKET;
5050                drain_and_close_socket(csp->cfd);
5051                csp->cfd = JB_INVALID_SOCKET;
5052                privoxy_mutex_lock(&connection_reuse_mutex);
5053                if (!monitor_thread_running)
5054                {
5055                   monitor_thread_running = 1;
5056                   privoxy_mutex_unlock(&connection_reuse_mutex);
5057                   wait_for_alive_connections();
5058                   privoxy_mutex_lock(&connection_reuse_mutex);
5059                   monitor_thread_running = 0;
5060                }
5061                privoxy_mutex_unlock(&connection_reuse_mutex);
5062             }
5063 #endif /* def FEATURE_CONNECTION_SHARING */
5064             break;
5065          }
5066       }
5067       else if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5068       {
5069          log_error(LOG_LEVEL_CONNECT,
5070             "Closing server socket %d connected to %s. Keep-alive: %u. "
5071             "Tainted: %u. Socket alive: %u. Timeout: %u. "
5072             "Configuration file change detected: %u",
5073             csp->server_connection.sfd, csp->server_connection.host,
5074             0 != (csp->flags & CSP_FLAG_SERVER_CONNECTION_KEEP_ALIVE),
5075             0 != (csp->flags & CSP_FLAG_SERVER_SOCKET_TAINTED),
5076             socket_is_still_alive(csp->server_connection.sfd),
5077             csp->server_connection.keep_alive_timeout,
5078             config_file_change_detected);
5079       }
5080    } while (continue_chatting);
5081
5082 #else
5083    chat(csp);
5084 #endif /* def FEATURE_CONNECTION_KEEP_ALIVE */
5085
5086    if (csp->cfd != JB_INVALID_SOCKET)
5087    {
5088       log_error(LOG_LEVEL_CONNECT, "Closing client socket %d. "
5089          "Keep-alive: %u. Socket alive: %u. Data available: %u. "
5090          "Configuration file change detected: %u. Requests received: %u.",
5091          csp->cfd, 0 != (csp->flags & CSP_FLAG_CLIENT_CONNECTION_KEEP_ALIVE),
5092          socket_is_still_alive(csp->cfd), data_is_available(csp->cfd, 0),
5093          config_file_change_detected, csp->requests_received_total);
5094 #ifdef FEATURE_HTTPS_INSPECTION
5095       close_client_ssl_connection(csp);
5096 #endif
5097       drain_and_close_socket(csp->cfd);
5098    }
5099
5100    if (csp->server_connection.sfd != JB_INVALID_SOCKET)
5101    {
5102 #ifdef FEATURE_CONNECTION_SHARING
5103       if (csp->config->feature_flags & RUNTIME_FEATURE_CONNECTION_SHARING)
5104       {
5105          forget_connection(csp->server_connection.sfd);
5106       }
5107 #endif /* def FEATURE_CONNECTION_SHARING */
5108
5109 #ifdef FEATURE_HTTPS_INSPECTION
5110       close_server_ssl_connection(csp);
5111 #endif /* def FEATURE_HTTPS_INSPECTION */
5112
5113       close_socket(csp->server_connection.sfd);
5114    }
5115
5116 #ifdef FEATURE_CONNECTION_KEEP_ALIVE
5117    mark_connection_closed(&csp->server_connection);
5118 #endif
5119
5120    free_csp_resources(csp);
5121
5122    csp->flags &= ~CSP_FLAG_ACTIVE;
5123
5124 }
5125
5126
5127 #ifdef __BEOS__
5128 /*********************************************************************
5129  *
5130  * Function    :  server_thread
5131  *
5132  * Description :  We only exist to call `serve' in a threaded environment.
5133  *
5134  * Parameters  :
5135  *          1  :  data = Current client state (buffers, headers, etc...)
5136  *
5137  * Returns     :  Always 0.
5138  *
5139  *********************************************************************/
5140 static int32 server_thread(void *data)
5141 {
5142    serve((struct client_state *) data);
5143    return 0;
5144
5145 }
5146 #endif
5147
5148
5149 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5150 /*********************************************************************
5151  *
5152  * Function    :  usage
5153  *
5154  * Description :  Print usage info & exit.
5155  *
5156  * Parameters  :  Pointer to argv[0] for identifying ourselves
5157  *
5158  * Returns     :  No. ,-)
5159  *
5160  *********************************************************************/
5161 static void usage(const char *name)
5162 {
5163    printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n"
5164           "Usage: %s [--config-test] "
5165 #if defined(unix)
5166           "[--chroot] "
5167 #endif /* defined(unix) */
5168           "[--help] "
5169 #if defined(unix)
5170           "[--no-daemon] [--pidfile pidfile] [--pre-chroot-nslookup hostname] [--user user[.group]] "
5171 #endif /* defined(unix) */
5172          "[--version] [configfile]\n",
5173           name);
5174
5175 #ifdef FUZZ
5176    show_fuzz_usage(name);
5177 #endif
5178
5179    printf("Aborting\n");
5180
5181    exit(2);
5182
5183 }
5184 #endif /* #if !defined(_WIN32) || defined(_WIN_CONSOLE) */
5185
5186
5187 #ifdef MUTEX_LOCKS_AVAILABLE
5188 /*********************************************************************
5189  *
5190  * Function    :  privoxy_mutex_lock
5191  *
5192  * Description :  Locks a mutex.
5193  *
5194  * Parameters  :
5195  *          1  :  mutex = The mutex to lock.
5196  *
5197  * Returns     :  Void. May exit in case of errors.
5198  *
5199  *********************************************************************/
5200 void privoxy_mutex_lock(privoxy_mutex_t *mutex)
5201 {
5202 #ifdef FEATURE_PTHREAD
5203    int err = pthread_mutex_lock(mutex);
5204    if (err)
5205    {
5206       if (mutex != &log_mutex)
5207       {
5208          log_error(LOG_LEVEL_FATAL,
5209             "Mutex locking failed: %s.\n", strerror(err));
5210       }
5211       exit(1);
5212    }
5213 #else
5214    EnterCriticalSection(mutex);
5215 #endif /* def FEATURE_PTHREAD */
5216 }
5217
5218
5219 /*********************************************************************
5220  *
5221  * Function    :  privoxy_mutex_unlock
5222  *
5223  * Description :  Unlocks a mutex.
5224  *
5225  * Parameters  :
5226  *          1  :  mutex = The mutex to unlock.
5227  *
5228  * Returns     :  Void. May exit in case of errors.
5229  *
5230  *********************************************************************/
5231 void privoxy_mutex_unlock(privoxy_mutex_t *mutex)
5232 {
5233 #ifdef FEATURE_PTHREAD
5234    int err = pthread_mutex_unlock(mutex);
5235    if (err)
5236    {
5237       if (mutex != &log_mutex)
5238       {
5239          log_error(LOG_LEVEL_FATAL,
5240             "Mutex unlocking failed: %s.\n", strerror(err));
5241       }
5242       exit(1);
5243    }
5244 #else
5245    LeaveCriticalSection(mutex);
5246 #endif /* def FEATURE_PTHREAD */
5247 }
5248
5249
5250 /*********************************************************************
5251  *
5252  * Function    :  privoxy_mutex_init
5253  *
5254  * Description :  Prepares a mutex.
5255  *
5256  * Parameters  :
5257  *          1  :  mutex = The mutex to initialize.
5258  *
5259  * Returns     :  Void. May exit in case of errors.
5260  *
5261  *********************************************************************/
5262 static void privoxy_mutex_init(privoxy_mutex_t *mutex)
5263 {
5264 #ifdef FEATURE_PTHREAD
5265    int err = pthread_mutex_init(mutex, 0);
5266    if (err)
5267    {
5268       printf("Fatal error. Mutex initialization failed: %s.\n",
5269          strerror(err));
5270       exit(1);
5271    }
5272 #else
5273    InitializeCriticalSection(mutex);
5274 #endif /* def FEATURE_PTHREAD */
5275 }
5276 #endif /* def MUTEX_LOCKS_AVAILABLE */
5277
5278 /*********************************************************************
5279  *
5280  * Function    :  initialize_mutexes
5281  *
5282  * Description :  Prepares mutexes if mutex support is available.
5283  *
5284  * Parameters  :  None
5285  *
5286  * Returns     :  Void, exits in case of errors.
5287  *
5288  *********************************************************************/
5289 static void initialize_mutexes(void)
5290 {
5291 #ifdef MUTEX_LOCKS_AVAILABLE
5292    /*
5293     * Prepare global mutex semaphores
5294     */
5295
5296 #ifdef FEATURE_HTTPS_INSPECTION
5297    privoxy_mutex_init(&certificate_mutex);
5298    privoxy_mutex_init(&ssl_init_mutex);
5299 #endif
5300
5301    privoxy_mutex_init(&log_mutex);
5302    privoxy_mutex_init(&log_init_mutex);
5303    privoxy_mutex_init(&connection_reuse_mutex);
5304 #ifdef FEATURE_EXTERNAL_FILTERS
5305    privoxy_mutex_init(&external_filter_mutex);
5306 #endif
5307 #ifdef FEATURE_CLIENT_TAGS
5308    privoxy_mutex_init(&client_tags_mutex);
5309 #endif
5310 #ifdef FEATURE_STATISTICS
5311    privoxy_mutex_init(&block_statistics_mutex);
5312 #endif
5313 #ifdef FEATURE_EXTENDED_STATISTICS
5314    privoxy_mutex_init(&filter_statistics_mutex);
5315    privoxy_mutex_init(&block_reason_statistics_mutex);
5316 #endif
5317
5318    /*
5319     * XXX: The assumptions below are a bit naive
5320     * and can cause locks that aren't necessary.
5321     *
5322     * For example older FreeBSD versions (< 6.x?)
5323     * have no gethostbyname_r, but gethostbyname is
5324     * thread safe.
5325     */
5326 #if !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R)
5327    privoxy_mutex_init(&resolver_mutex);
5328 #endif /* !defined(HAVE_GETHOSTBYADDR_R) || !defined(HAVE_GETHOSTBYNAME_R) */
5329    /*
5330     * XXX: should we use a single mutex for
5331     * localtime() and gmtime() as well?
5332     */
5333 #ifndef HAVE_GMTIME_R
5334    privoxy_mutex_init(&gmtime_mutex);
5335 #endif /* ndef HAVE_GMTIME_R */
5336
5337 #ifndef HAVE_LOCALTIME_R
5338    privoxy_mutex_init(&localtime_mutex);
5339 #endif /* ndef HAVE_GMTIME_R */
5340
5341 #if !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM)
5342    privoxy_mutex_init(&rand_mutex);
5343 #endif /* !defined(HAVE_ARC4RANDOM) && !defined(HAVE_RANDOM) */
5344
5345 #endif /* def MUTEX_LOCKS_AVAILABLE */
5346 }
5347
5348 /*********************************************************************
5349  *
5350  * Function    :  main
5351  *
5352  * Description :  Load the config file and start the listen loop.
5353  *                This function is a lot more *sane* with the `load_config'
5354  *                and `listen_loop' functions; although it stills does
5355  *                a *little* too much for my taste.
5356  *
5357  * Parameters  :
5358  *          1  :  argc = Number of parameters (including $0).
5359  *          2  :  argv = Array of (char *)'s to the parameters.
5360  *
5361  * Returns     :  1 if : can't open config file, unrecognized directive,
5362  *                stats requested in multi-thread mode, can't open the
5363  *                log file, can't open the jar file, listen port is invalid,
5364  *                any load fails, and can't bind port.
5365  *
5366  *                Else main never returns, the process must be signaled
5367  *                to terminate execution.  Or, on Windows, use the
5368  *                "File", "Exit" menu option.
5369  *
5370  *********************************************************************/
5371 #ifdef __MINGW32__
5372 int real_main(int argc, char **argv)
5373 #else
5374 int main(int argc, char **argv)
5375 #endif
5376 {
5377    int argc_pos = 0;
5378    int do_config_test = 0;
5379 #ifndef HAVE_ARC4RANDOM
5380    unsigned int random_seed;
5381 #endif
5382 #ifdef unix
5383    struct passwd *pw = NULL;
5384    struct group *grp = NULL;
5385    int do_chroot = 0;
5386    char *pre_chroot_nslookup_to_load_resolver = NULL;
5387 #endif
5388 #ifdef FUZZ
5389    char *fuzz_input_type = NULL;
5390    char *fuzz_input_file = NULL;
5391 #endif
5392
5393    Argc = argc;
5394    Argv = argv;
5395
5396    configfile =
5397 #if !defined(_WIN32)
5398    "config"
5399 #else
5400    "config.txt"
5401 #endif
5402       ;
5403
5404    /* Prepare mutexes if supported and necessary. */
5405    initialize_mutexes();
5406
5407    /* Enable logging until further notice. */
5408    init_log_module();
5409
5410    /*
5411     * Parse the command line arguments
5412     *
5413     * XXX: simply printing usage information in case of
5414     * invalid arguments isn't particularly user friendly.
5415     */
5416    while (++argc_pos < argc)
5417    {
5418 #ifdef _WIN32
5419       /* Check to see if the service must be installed or uninstalled */
5420       if (strncmp(argv[argc_pos], "--install", 9) == 0)
5421       {
5422          const char *pName = argv[argc_pos] + 9;
5423          if (*pName == ':')
5424             pName++;
5425          exit((install_service(pName)) ? 0 : 1);
5426       }
5427       else if (strncmp(argv[argc_pos], "--uninstall", 11) == 0)
5428       {
5429          const char *pName = argv[argc_pos] + 11;
5430          if (*pName == ':')
5431             pName++;
5432          exit((uninstall_service(pName)) ? 0 : 1);
5433       }
5434       else if (strcmp(argv[argc_pos], "--service") == 0)
5435       {
5436          bRunAsService = TRUE;
5437          w32_set_service_cwd();
5438          atexit(w32_service_exit_notify);
5439       }
5440       else
5441 #endif /* defined(_WIN32) */
5442
5443
5444 #if !defined(_WIN32) || defined(_WIN_CONSOLE)
5445
5446       if (strcmp(argv[argc_pos], "--help") == 0)
5447       {
5448          usage(argv[0]);
5449       }
5450
5451       else if (strcmp(argv[argc_pos], "--version") == 0)
5452       {
5453          printf("Privoxy version " VERSION " (" HOME_PAGE_URL ")\n");
5454          exit(0);
5455       }
5456
5457 #if defined(unix)
5458
5459       else if (strcmp(argv[argc_pos], "--no-daemon") == 0)
5460       {
5461          set_debug_level(LOG_LEVEL_FATAL | LOG_LEVEL_ERROR | LOG_LEVEL_INFO);
5462          daemon_mode = 0;
5463       }
5464
5465       else if (strcmp(argv[argc_pos], "--pidfile") == 0)
5466       {
5467          if (++argc_pos == argc) usage(argv[0]);
5468          pidfile = strdup_or_die(argv[argc_pos]);
5469       }
5470
5471       else if (strcmp(argv[argc_pos], "--user") == 0)
5472       {
5473          char *user_arg;
5474          char *group_name;
5475
5476          if (++argc_pos == argc) usage(argv[argc_pos]);
5477
5478          user_arg = strdup_or_die(argv[argc_pos]);
5479          group_name = strchr(user_arg, '.');
5480          if (NULL != group_name)
5481          {
5482             /* Nul-terminate the user name */
5483             *group_name = '\0';
5484
5485             /* Skip the former delimiter to actually reach the group name */
5486             group_name++;
5487
5488             grp = getgrnam(group_name);
5489             if (NULL == grp)
5490             {
5491                log_error(LOG_LEVEL_FATAL, "Group '%s' not found.", group_name);
5492             }
5493          }
5494          pw = getpwnam(user_arg);
5495          if (NULL == pw)
5496          {
5497             log_error(LOG_LEVEL_FATAL, "User '%s' not found.", user_arg);
5498          }
5499
5500          freez(user_arg);
5501       }
5502
5503       else if (strcmp(argv[argc_pos], "--pre-chroot-nslookup") == 0)
5504       {
5505          if (++argc_pos == argc) usage(argv[0]);
5506          pre_chroot_nslookup_to_load_resolver = strdup_or_die(argv[argc_pos]);
5507       }
5508
5509       else if (strcmp(argv[argc_pos], "--chroot") == 0)
5510       {
5511          do_chroot = 1;
5512       }
5513 #endif /* defined(unix) */
5514
5515       else if (strcmp(argv[argc_pos], "--config-test") == 0)
5516       {
5517          do_config_test = 1;
5518       }
5519 #ifdef FUZZ
5520       else if (strcmp(argv[argc_pos], "--fuzz") == 0)
5521       {
5522          argc_pos++;
5523          if (argc < argc_pos + 2) usage(argv[0]);
5524          fuzz_input_type = argv[argc_pos];
5525          argc_pos++;
5526          fuzz_input_file = argv[argc_pos];
5527       }
5528       else if (strcmp(argv[argc_pos], "--stfu") == 0)
5529       {
5530          set_debug_level(LOG_LEVEL_STFU);
5531       }
5532 #endif
5533       else if (argc_pos + 1 != argc)
5534       {
5535          /*
5536           * This is neither the last command line
5537           * option, nor was it recognized before,
5538           * therefore it must be invalid.
5539           */
5540          usage(argv[0]);
5541       }
5542       else
5543
5544 #endif /* defined(_WIN32) && !defined(_WIN_CONSOLE) */
5545       {
5546          configfile = argv[argc_pos];
5547       }
5548
5549    } /* -END- while (more arguments) */
5550
5551    show_version(Argv[0]);
5552
5553 #if defined(unix)
5554    if (*configfile != '/')
5555    {
5556       char cwd[BUFFER_SIZE];
5557       char *abs_file;
5558       size_t abs_file_size;
5559
5560       /* make config-filename absolute here */
5561       if (NULL == getcwd(cwd, sizeof(cwd)))
5562       {
5563          perror("failed to get current working directory");
5564          exit(1);
5565       }
5566
5567       basedir = strdup_or_die(cwd);
5568       /* XXX: why + 5? */
5569       abs_file_size = strlen(cwd) + strlen(configfile) + 5;
5570       abs_file = malloc_or_die(abs_file_size);
5571       strlcpy(abs_file, basedir, abs_file_size);
5572       strlcat(abs_file, "/", abs_file_size);
5573       strlcat(abs_file, configfile, abs_file_size);
5574       configfile = abs_file;
5575    }
5576 #endif /* defined unix */
5577
5578
5579    files->next = NULL;
5580    clients->next = NULL;
5581
5582    /* XXX: factor out initialising after the next stable release. */
5583 #ifdef _WIN32
5584    InitWin32();
5585 #endif
5586
5587 #ifndef HAVE_ARC4RANDOM
5588    random_seed = (unsigned int)time(NULL);
5589 #ifdef HAVE_RANDOM
5590    srandom(random_seed);
5591 #else
5592    srand(random_seed);
5593 #endif /* ifdef HAVE_RANDOM */
5594 #endif /* ifndef HAVE_ARC4RANDOM */
5595
5596    /*
5597     * Unix signal handling
5598     *
5599     * Catch the abort, interrupt and terminate signals for a graceful exit
5600     * Catch the hangup signal so the errlog can be reopened.
5601     *
5602     * Ignore the broken pipe signal as connection failures
5603     * are handled when and where they occur without relying
5604     * on a signal.
5605     */
5606 #if !defined(_WIN32)
5607 {
5608    int idx;
5609    const int catched_signals[] = { SIGTERM, SIGINT, SIGHUP };
5610
5611    for (idx = 0; idx < SZ(catched_signals); idx++)
5612    {
5613 #ifdef sun /* FIXME: Is it safe to check for HAVE_SIGSET instead? */
5614       if (sigset(catched_signals[idx], sig_handler) == SIG_ERR)
5615 #else
5616       if (signal(catched_signals[idx], sig_handler) == SIG_ERR)
5617 #endif /* ifdef sun */
5618       {
5619          log_error(LOG_LEVEL_FATAL, "Can't set signal-handler for signal %d: %E", catched_signals[idx]);
5620       }
5621    }
5622
5623    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
5624    {
5625       log_error(LOG_LEVEL_FATAL, "Can't set ignore-handler for SIGPIPE: %E");
5626    }
5627
5628 }
5629 #else /* ifdef _WIN32 */
5630 # ifdef _WIN_CONSOLE
5631    /*
5632     * We *are* in a windows console app.
5633     * Print a verbose messages about FAQ's and such
5634     */
5635    printf("%s", win32_blurb);
5636 # endif /* def _WIN_CONSOLE */
5637 #endif /* def _WIN32 */
5638
5639 #ifdef FUZZ
5640    if (fuzz_input_type != NULL)
5641    {
5642       exit(process_fuzzed_input(fuzz_input_type, fuzz_input_file));
5643    }
5644    log_error(LOG_LEVEL_FATAL,
5645       "When compiled with fuzzing support, Privoxy should only be used for fuzzing. "
5646       "Various data structures are static which is unsafe when using threads.");
5647 #endif
5648
5649    if (do_config_test)
5650    {
5651       exit(NULL == load_config());
5652    }
5653
5654    /* Initialize the CGI subsystem */
5655    cgi_init_error_messages();
5656
5657    /*
5658     * If running on unix and without the --no-daemon
5659     * option, become a daemon. I.e. fork, detach
5660     * from tty and get process group leadership
5661     */
5662 #if defined(unix)
5663 {
5664    if (daemon_mode)
5665    {
5666       int fd;
5667       pid_t pid = fork();
5668
5669       if (pid < 0) /* error */
5670       {
5671          perror("fork");
5672          exit(3);
5673       }
5674       else if (pid != 0) /* parent */
5675       {
5676          int status;
5677          pid_t wpid;
5678          /*
5679           * must check for errors
5680           * child died due to missing files aso
5681           */
5682          sleep(1);
5683          wpid = waitpid(pid, &status, WNOHANG);
5684          if (wpid != 0)
5685          {
5686             exit(1);
5687          }
5688          exit(0);
5689       }
5690       /* child */
5691
5692       setsid();
5693
5694       /*
5695        * stderr (fd 2) will be closed later on,
5696        * when the config file has been parsed.
5697        */
5698       close(0);
5699       close(1);
5700
5701       /*
5702        * Reserve fd 0 and 1 to prevent abort() and friends
5703        * from sending stuff to the clients or servers.
5704        */
5705       fd = open("/dev/null", O_RDONLY);
5706       if (fd == -1)
5707       {
5708          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5709       }
5710       else if (fd != 0)
5711       {
5712          if (dup2(fd, 0) == -1)
5713          {
5714             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 0: %E");
5715          }
5716          close(fd);
5717       }
5718       fd = open("/dev/null", O_WRONLY);
5719       if (fd == -1)
5720       {
5721          log_error(LOG_LEVEL_FATAL, "Failed to open /dev/null: %E");
5722       }
5723       else if (fd != 1)
5724       {
5725          if (dup2(fd, 1) == -1)
5726          {
5727             log_error(LOG_LEVEL_FATAL, "Failed to reserve fd 1: %E");
5728          }
5729          close(fd);
5730       }
5731
5732 #ifdef FEATURE_EXTERNAL_FILTERS
5733       for (fd = 0; fd < 3; fd++)
5734       {
5735          mark_socket_for_close_on_execute(fd);
5736       }
5737 #endif
5738
5739       if (chdir("/") != 0)
5740       {
5741          log_error(LOG_LEVEL_FATAL, "Failed to cd into '/': %E");
5742       }
5743
5744    } /* -END- if (daemon_mode) */
5745
5746    /*
5747     * As soon as we have written the PID file, we can switch
5748     * to the user and group ID indicated by the --user option
5749     */
5750    if (pidfile != NULL)
5751    {
5752       write_pid_file(pidfile);
5753    }
5754    if (NULL != pw)
5755    {
5756       if (setgid((NULL != grp) ? grp->gr_gid : pw->pw_gid))
5757       {
5758          log_error(LOG_LEVEL_FATAL, "Cannot setgid(): Insufficient permissions.");
5759       }
5760       if (NULL != grp)
5761       {
5762          if (setgroups(1, &grp->gr_gid))
5763          {
5764             log_error(LOG_LEVEL_FATAL, "setgroups() failed: %E");
5765          }
5766       }
5767       else if (initgroups(pw->pw_name, pw->pw_gid))
5768       {
5769          log_error(LOG_LEVEL_FATAL, "initgroups() failed: %E");
5770       }
5771       if (do_chroot)
5772       {
5773          if (!pw->pw_dir)
5774          {
5775             log_error(LOG_LEVEL_FATAL, "Home directory for %s undefined", pw->pw_name);
5776          }
5777          /* Read the time zone file from /etc before doing chroot. */
5778          tzset();
5779          if (NULL != pre_chroot_nslookup_to_load_resolver
5780              && '\0' != pre_chroot_nslookup_to_load_resolver[0])
5781          {
5782             /* Initialize resolver library. */
5783             (void) resolve_hostname_to_ip(pre_chroot_nslookup_to_load_resolver);
5784          }
5785          if (chroot(pw->pw_dir) < 0)
5786          {
5787             log_error(LOG_LEVEL_FATAL, "Cannot chroot to %s", pw->pw_dir);
5788          }
5789          if (chdir ("/"))
5790          {
5791             log_error(LOG_LEVEL_FATAL, "Cannot chdir /");
5792          }
5793       }
5794       if (setuid(pw->pw_uid))
5795       {
5796          log_error(LOG_LEVEL_FATAL, "Cannot setuid(): Insufficient permissions.");
5797       }
5798       if (do_chroot)
5799       {
5800          char putenv_dummy[64];
5801
5802          strlcpy(putenv_dummy, "HOME=/", sizeof(putenv_dummy));
5803          if (putenv(putenv_dummy) != 0)
5804          {
5805             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): HOME");
5806          }
5807
5808          snprintf(putenv_dummy, sizeof(putenv_dummy), "USER=%s", pw->pw_name);
5809          if (putenv(putenv_dummy) != 0)
5810          {
5811             log_error(LOG_LEVEL_FATAL, "Cannot putenv(): USER");
5812          }
5813       }
5814    }
5815    else if (do_chroot)
5816    {
5817       log_error(LOG_LEVEL_FATAL, "Cannot chroot without --user argument.");
5818    }
5819 }
5820 #endif /* defined unix */
5821
5822 #ifdef _WIN32
5823    /* This will be FALSE unless the command line specified --service
5824     */
5825    if (bRunAsService)
5826    {
5827       /* Yup, so now we must attempt to establish a connection
5828        * with the service dispatcher. This will only work if this
5829        * process was launched by the service control manager to
5830        * actually run as a service. If this isn't the case, i've
5831        * known it take around 30 seconds or so for the call to return.
5832        */
5833
5834       /* The StartServiceCtrlDispatcher won't return until the service is stopping */
5835       if (w32_start_service_ctrl_dispatcher(w32ServiceDispatchTable))
5836       {
5837          /* Service has run, and at this point is now being stopped, so just return */
5838          return 0;
5839       }
5840
5841 #ifdef _WIN_CONSOLE
5842       printf("Warning: Failed to connect to Service Control Dispatcher\nwhen starting as a service!\n");
5843 #endif
5844       /* An error occurred. Usually it's because --service was wrongly specified
5845        * and we were unable to connect to the Service Control Dispatcher because
5846        * it wasn't expecting us and is therefore not listening.
5847        *
5848        * For now, just continue below to call the listen_loop function.
5849        */
5850    }
5851 #endif /* def _WIN32 */
5852
5853    listen_loop();
5854
5855    /* NOTREACHED */
5856    return(-1);
5857
5858 }
5859
5860
5861 /*********************************************************************
5862  *
5863  * Function    :  bind_port_helper
5864  *
5865  * Description :  Bind the listen port.  Handles logging, and aborts
5866  *                on failure.
5867  *
5868  * Parameters  :
5869  *          1  :  haddr = Host address to bind to. Use NULL to bind to
5870  *                        INADDR_ANY.
5871  *          2  :  hport = Specifies port to bind to.
5872  *          3  :  backlog = Listen backlog.
5873  *
5874  * Returns     :  Port that was opened.
5875  *
5876  *********************************************************************/
5877 static jb_socket bind_port_helper(const char *haddr, int hport, int backlog)
5878 {
5879    int result;
5880    jb_socket bfd;
5881
5882    result = bind_port(haddr, hport, backlog, &bfd);
5883
5884    if (result < 0)
5885    {
5886       const char *bind_address = (NULL != haddr) ? haddr : "INADDR_ANY";
5887       switch(result)
5888       {
5889          case -3:
5890             log_error(LOG_LEVEL_FATAL,
5891                "can't bind to %s:%d: There may be another Privoxy "
5892                "or some other proxy running on port %d",
5893                bind_address, hport, hport);
5894             exit(-1);
5895
5896          case -2:
5897             log_error(LOG_LEVEL_FATAL,
5898                "can't bind to %s:%d: The hostname is not resolvable",
5899                bind_address, hport);
5900             exit(-1);
5901
5902          default:
5903             log_error(LOG_LEVEL_FATAL, "can't bind to %s:%d: %E",
5904                bind_address, hport);
5905             exit(-1);
5906       }
5907
5908       /* shouldn't get here */
5909       return JB_INVALID_SOCKET;
5910    }
5911
5912 #ifndef HAVE_POLL
5913 #ifndef _WIN32
5914    if (bfd >= FD_SETSIZE)
5915    {
5916       log_error(LOG_LEVEL_FATAL,
5917          "Bind socket number too high to use select(): %d >= %d",
5918          bfd, FD_SETSIZE);
5919    }
5920 #endif
5921 #endif
5922
5923    if (haddr == NULL)
5924    {
5925       log_error(LOG_LEVEL_INFO, "Listening on port %d on all IP addresses",
5926          hport);
5927    }
5928    else
5929    {
5930       log_error(LOG_LEVEL_INFO, "Listening on port %d on IP address %s",
5931          hport, haddr);
5932    }
5933
5934    return bfd;
5935 }
5936
5937
5938 /*********************************************************************
5939  *
5940  * Function    :  bind_ports_helper
5941  *
5942  * Description :  Bind the listen ports.  Handles logging, and aborts
5943  *                on failure.
5944  *
5945  * Parameters  :
5946  *          1  :  config = Privoxy configuration.  Specifies ports
5947  *                         to bind to.
5948  *          2  :  sockets = Preallocated array of opened sockets
5949  *                          corresponding to specification in config.
5950  *                          All non-opened sockets will be set to
5951  *                          JB_INVALID_SOCKET.
5952  *
5953  * Returns     :  Nothing. Inspect sockets argument.
5954  *
5955  *********************************************************************/
5956 static void bind_ports_helper(struct configuration_spec * config,
5957                               jb_socket sockets[])
5958 {
5959    int i;
5960
5961    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
5962    {
5963       if (config->hport[i])
5964       {
5965          sockets[i] = bind_port_helper(config->haddr[i],
5966             config->hport[i], config->listen_backlog);
5967 #if defined(FEATURE_ACCEPT_FILTER) && defined(SO_ACCEPTFILTER)
5968          if (config->enable_accept_filter && sockets[i] != JB_INVALID_SOCKET)
5969          {
5970             struct accept_filter_arg af_options;
5971             bzero(&af_options, sizeof(af_options));
5972             strlcpy(af_options.af_name, "httpready", sizeof(af_options.af_name));
5973             if (setsockopt(sockets[i], SOL_SOCKET, SO_ACCEPTFILTER, &af_options,
5974                   sizeof(af_options)))
5975             {
5976                log_error(LOG_LEVEL_ERROR,
5977                   "Enabling accept filter for socket %d failed: %E", sockets[i]);
5978             }
5979          }
5980 #endif
5981       }
5982       else
5983       {
5984          sockets[i] = JB_INVALID_SOCKET;
5985       }
5986    }
5987    config->need_bind = 0;
5988 }
5989
5990
5991 /*********************************************************************
5992  *
5993  * Function    :  close_ports_helper
5994  *
5995  * Description :  Close listenings ports.
5996  *
5997  * Parameters  :
5998  *          1  :  sockets = Array of opened and non-opened sockets to
5999  *                          close. All sockets will be set to
6000  *                          JB_INVALID_SOCKET.
6001  *
6002  * Returns     :  Nothing.
6003  *
6004  *********************************************************************/
6005 static void close_ports_helper(jb_socket sockets[])
6006 {
6007    int i;
6008
6009    for (i = 0; i < MAX_LISTENING_SOCKETS; i++)
6010    {
6011       if (JB_INVALID_SOCKET != sockets[i])
6012       {
6013          close_socket(sockets[i]);
6014       }
6015       sockets[i] = JB_INVALID_SOCKET;
6016    }
6017 }
6018
6019
6020 #ifdef _WIN32
6021 /* Without this simple workaround we get this compiler warning from _beginthread
6022  *     warning C4028: formal parameter 1 different from declaration
6023  */
6024 void w32_service_listen_loop(void *p)
6025 {
6026    listen_loop();
6027 }
6028 #endif /* def _WIN32 */
6029
6030
6031 /*********************************************************************
6032  *
6033  * Function    :  listen_loop
6034  *
6035  * Description :  bind the listen port and enter a "FOREVER" listening loop.
6036  *
6037  * Parameters  :  N/A
6038  *
6039  * Returns     :  Never.
6040  *
6041  *********************************************************************/
6042 static void listen_loop(void)
6043 {
6044    struct client_states *csp_list = NULL;
6045    struct client_state *csp = NULL;
6046    jb_socket bfds[MAX_LISTENING_SOCKETS];
6047    struct configuration_spec *config;
6048    unsigned int active_threads = 0;
6049 #if defined(FEATURE_PTHREAD)
6050    pthread_attr_t attrs;
6051
6052    pthread_attr_init(&attrs);
6053    pthread_attr_setdetachstate(&attrs, PTHREAD_CREATE_DETACHED);
6054 #endif
6055
6056    config = load_config();
6057
6058 #ifdef FEATURE_CONNECTION_SHARING
6059    /*
6060     * XXX: Should be relocated once it no
6061     * longer needs to emit log messages.
6062     */
6063    initialize_reusable_connections();
6064 #endif /* def FEATURE_CONNECTION_SHARING */
6065
6066    bind_ports_helper(config, bfds);
6067
6068 #ifdef FEATURE_GRACEFUL_TERMINATION
6069    while (!g_terminate)
6070 #else
6071    for (;;)
6072 #endif
6073    {
6074 #if !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__)
6075       while (waitpid(-1, NULL, WNOHANG) > 0)
6076       {
6077          /* zombie children */
6078       }
6079 #endif /* !defined(FEATURE_PTHREAD) && !defined(_WIN32) && !defined(__BEOS__) */
6080
6081       /*
6082        * Free data that was used by died threads
6083        */
6084       active_threads = sweep();
6085
6086 #if defined(unix)
6087       /*
6088        * Re-open the errlog after HUP signal
6089        */
6090       if (received_hup_signal)
6091       {
6092          if (NULL != config->logfile)
6093          {
6094             init_error_log(Argv[0], config->logfile);
6095          }
6096          received_hup_signal = 0;
6097       }
6098 #endif
6099
6100       csp_list = zalloc_or_die(sizeof(*csp_list));
6101       csp = &csp_list->csp;
6102
6103       log_error(LOG_LEVEL_CONNECT,
6104          "Waiting for the next client connection. Currently active threads: %u",
6105          active_threads);
6106
6107       /*
6108        * This config may be outdated, but for accept_connection()
6109        * it's fresh enough.
6110        */
6111       csp->config = config;
6112
6113       if (!accept_connection(csp, bfds))
6114       {
6115          log_error(LOG_LEVEL_CONNECT, "accept failed: %E");
6116          freez(csp_list);
6117          continue;
6118       }
6119
6120       csp->flags |= CSP_FLAG_ACTIVE;
6121       csp->server_connection.sfd = JB_INVALID_SOCKET;
6122
6123       csp->config = config = load_config();
6124
6125       if (config->need_bind)
6126       {
6127          /*
6128           * Since we were listening to the "old port", we will not see
6129           * a "listen" param change until the next request.  So, at
6130           * least 1 more request must be made for us to find the new
6131           * setting.  I am simply closing the old socket and binding the
6132           * new one.
6133           *
6134           * Which-ever is correct, we will serve 1 more page via the
6135           * old settings.  This should probably be a "show-status"
6136           * request.  This should not be a so common of an operation
6137           * that this will hurt people's feelings.
6138           */
6139
6140          close_ports_helper(bfds);
6141
6142          bind_ports_helper(config, bfds);
6143       }
6144
6145 #ifdef FEATURE_TOGGLE
6146       if (global_toggle_state)
6147 #endif /* def FEATURE_TOGGLE */
6148       {
6149          csp->flags |= CSP_FLAG_TOGGLED_ON;
6150       }
6151
6152       if (run_loader(csp))
6153       {
6154          log_error(LOG_LEVEL_FATAL, "a loader failed - must exit");
6155          /* Never get here - LOG_LEVEL_FATAL causes program exit */
6156       }
6157
6158 #ifdef FEATURE_ACL
6159       if (block_acl(NULL,csp))
6160       {
6161          log_error(LOG_LEVEL_CONNECT,
6162             "Connection from %s on %s (socket %d) dropped due to ACL",
6163             csp->ip_addr_str, csp->listen_addr_str, csp->cfd);
6164          close_socket(csp->cfd);
6165          freez(csp->ip_addr_str);
6166          freez(csp->listen_addr_str);
6167          freez(csp_list);
6168          continue;
6169       }
6170 #endif /* def FEATURE_ACL */
6171
6172       if ((0 != config->max_client_connections)
6173          && (active_threads >= config->max_client_connections))
6174       {
6175          log_error(LOG_LEVEL_ERROR,
6176             "Rejecting connection from %s. Maximum number of connections reached.",
6177             csp->ip_addr_str);
6178          write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6179             strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6180          close_socket(csp->cfd);
6181          freez(csp->ip_addr_str);
6182          freez(csp->listen_addr_str);
6183          freez(csp_list);
6184          continue;
6185       }
6186
6187       /* add it to the list of clients */
6188       csp_list->next = clients->next;
6189       clients->next = csp_list;
6190
6191       if (config->multi_threaded)
6192       {
6193          int child_id;
6194
6195 /* this is a switch () statement in the C preprocessor - ugh */
6196 #undef SELECTED_ONE_OPTION
6197
6198 /* Use Pthreads in preference to native code */
6199 #if defined(FEATURE_PTHREAD) && !defined(SELECTED_ONE_OPTION)
6200 #define SELECTED_ONE_OPTION
6201          {
6202             pthread_t the_thread;
6203             int ret;
6204
6205             ret = pthread_create(&the_thread, &attrs,
6206                (void * (*)(void *))serve, csp);
6207             child_id = ret ? -1 : 0;
6208          }
6209 #endif
6210
6211 #if defined(_WIN32) && !defined(SELECTED_ONE_OPTION)
6212 #define SELECTED_ONE_OPTION
6213          child_id = _beginthread(
6214             (void (*)(void *))serve,
6215             64 * 1024,
6216             csp);
6217 #endif
6218
6219 #if defined(__BEOS__) && !defined(SELECTED_ONE_OPTION)
6220 #define SELECTED_ONE_OPTION
6221          {
6222             thread_id tid = spawn_thread
6223                (server_thread, "server", B_NORMAL_PRIORITY, csp);
6224
6225             if ((tid >= 0) && (resume_thread(tid) == B_OK))
6226             {
6227                child_id = (int) tid;
6228             }
6229             else
6230             {
6231                child_id = -1;
6232             }
6233          }
6234 #endif
6235
6236 #if !defined(SELECTED_ONE_OPTION)
6237          child_id = fork();
6238
6239          /* This block is only needed when using fork().
6240           * When using threads, the server thread was
6241           * created and run by the call to _beginthread().
6242           */
6243          if (child_id == 0)   /* child */
6244          {
6245             int rc = 0;
6246 #ifdef FEATURE_TOGGLE
6247             int inherited_toggle_state = global_toggle_state;
6248 #endif /* def FEATURE_TOGGLE */
6249
6250             serve(csp);
6251
6252             /*
6253              * If we've been toggled or we've blocked the request, tell Mom
6254              */
6255
6256 #ifdef FEATURE_TOGGLE
6257             if (inherited_toggle_state != global_toggle_state)
6258             {
6259                rc |= RC_FLAG_TOGGLED;
6260             }
6261 #endif /* def FEATURE_TOGGLE */
6262
6263 #ifdef FEATURE_STATISTICS
6264             if (csp->flags & CSP_FLAG_REJECTED)
6265             {
6266                rc |= RC_FLAG_BLOCKED;
6267             }
6268 #endif /* ndef FEATURE_STATISTICS */
6269
6270             _exit(rc);
6271          }
6272          else if (child_id > 0) /* parent */
6273          {
6274             /* in a fork()'d environment, the parent's
6275              * copy of the client socket and the CSP
6276              * are not used.
6277              */
6278             int child_status;
6279 #if !defined(_WIN32) && !defined(__CYGWIN__)
6280
6281             wait(&child_status);
6282
6283             /*
6284              * Evaluate child's return code: If the child has
6285              *  - been toggled, toggle ourselves
6286              *  - blocked its request, bump up the stats counter
6287              */
6288
6289 #ifdef FEATURE_TOGGLE
6290             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_TOGGLED))
6291             {
6292                global_toggle_state = !global_toggle_state;
6293             }
6294 #endif /* def FEATURE_TOGGLE */
6295
6296 #ifdef FEATURE_STATISTICS
6297             urls_read++;
6298             if (WIFEXITED(child_status) && (WEXITSTATUS(child_status) & RC_FLAG_BLOCKED))
6299             {
6300                urls_rejected++;
6301             }
6302 #endif /* def FEATURE_STATISTICS */
6303
6304 #endif /* !defined(_WIN32) && defined(__CYGWIN__) */
6305             close_socket(csp->cfd);
6306             csp->flags &= ~CSP_FLAG_ACTIVE;
6307          }
6308 #endif
6309
6310 #undef SELECTED_ONE_OPTION
6311 /* end of cpp switch () */
6312
6313          if (child_id < 0)
6314          {
6315             /*
6316              * Spawning the child failed, assume it's because
6317              * there are too many children running already.
6318              * XXX: If you assume ...
6319              */
6320             log_error(LOG_LEVEL_ERROR,
6321                "Unable to take any additional connections: %E. Active threads: %u",
6322                active_threads);
6323             write_socket_delayed(csp->cfd, TOO_MANY_CONNECTIONS_RESPONSE,
6324                strlen(TOO_MANY_CONNECTIONS_RESPONSE), get_write_delay(csp));
6325             close_socket(csp->cfd);
6326             csp->flags &= ~CSP_FLAG_ACTIVE;
6327          }
6328       }
6329       else
6330       {
6331          serve(csp);
6332       }
6333    }
6334
6335 #if defined(FEATURE_PTHREAD)
6336    pthread_attr_destroy(&attrs);
6337 #endif
6338
6339    /* NOTREACHED unless FEATURE_GRACEFUL_TERMINATION is defined */
6340
6341 #ifdef FEATURE_GRACEFUL_TERMINATION
6342
6343    log_error(LOG_LEVEL_INFO, "Graceful termination requested.");
6344
6345    close_ports_helper(bfds);
6346
6347    unload_current_config_file();
6348    unload_current_actions_file();
6349    unload_current_re_filterfile();
6350 #ifdef FEATURE_TRUST
6351    unload_current_trust_file();
6352 #endif
6353
6354    if (config->multi_threaded)
6355    {
6356       int i = 60;
6357       do
6358       {
6359          sleep(1);
6360          sweep();
6361       } while ((clients->next != NULL) && (--i > 0));
6362
6363       if (i <= 0)
6364       {
6365          log_error(LOG_LEVEL_ERROR, "Graceful termination failed "
6366             "- still some live clients after 1 minute wait.");
6367       }
6368    }
6369    sweep();
6370    sweep();
6371
6372 #if defined(unix)
6373    freez(basedir);
6374 #endif
6375
6376 #ifdef FEATURE_HTTPS_INSPECTION
6377    /*
6378     * Only release TLS backed resources if there
6379     * are no active connections left.
6380     */
6381    if (clients->next == NULL)
6382    {
6383       ssl_release();
6384    }
6385 #endif
6386
6387    log_error(LOG_LEVEL_INFO, "Exiting gracefully.");
6388
6389 #if defined(_WIN32) && !defined(_WIN_CONSOLE)
6390    /* Cleanup - remove taskbar icon etc. */
6391    TermLogWindow();
6392 #endif
6393
6394    exit(0);
6395 #endif /* FEATURE_GRACEFUL_TERMINATION */
6396
6397 }
6398
6399
6400 /*
6401   Local Variables:
6402   tab-width: 3
6403   end:
6404 */